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UPDATING THE MAINTENANCE LOG Updating the Maintenance Log. A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairly easy to add new maintenance items for a givenpiece of
JAMES HAMILTON
James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling. Prior to AWS, James was architect on the Microsoft Data Center Futures team and before that he was architect on the Live Platform Services team. Prior to that he was General Managerof
FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit DIVING AND FLYING AT PALMYRA ATOLL Diving and flying at Palmyra Atoll. Palmyra Atoll, 950 miles south of Hawaii, is a National Fish and Wildlife Refuge where fishing is not allowed within the 12-mile Refuge boundary. Consequently, the fish life in the area is incredible. We’d done several dives there and were amazed at the abundance, health and diversity of the fish andcoral
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
LINUX/APACHE ON ARM PROCESSORS That web site is hosted on 7 servers, each running the following: · Single 1.2Ghz ARM processor, Marvell MV78100. · 1 disk. · 1.5 GB DDR2 with ECC! · Debian Linux. · Nginx web proxy/load balancer. · Apache web server. Note that, unlike Intel Atom based servers, this ARM-based solution has the full ECC memory support we want in server YOU REALLY DO NEED ECC MEMORY Hey William, good hearing from you. And, yeah, I totally agree that needing ECC is a unfortunate constraint in server purchases. But, there are two ways to get rid of the constraints: 1) develop systems that can operate correctly in the presence of massive datapath and memory errors or 2) convince client system buyers and builders they need ECC for the same reasons that server and embedded DIRONA AROUND THE WORLD Secret Coast. Our cruising guide, Waggoner sister publication Cruising the Secret Coast, is available at local bookstores and online. Click book image for details. Home. Destinations. Europe. Belgium. Denmark. UP THE WEST COAST OF VANCOUVER ISLAND Up the West Coast of Vancouver Island. It wasn't until last summer that we even entertained the prospect of cruising the west coast of Vancouver Island. It's completely exposed to the Pacific Ocean and receives some really nasty weather. Even on very good days there is a constant ocean swell, and on very bad days ships go down and lives arelost.
UPDATING THE MAINTENANCE LOG Updating the Maintenance Log. A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairly easy to add new maintenance items for a givenpiece of
JAMES HAMILTON
James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling. Prior to AWS, James was architect on the Microsoft Data Center Futures team and before that he was architect on the Live Platform Services team. Prior to that he was General Managerof
FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit DIVING AND FLYING AT PALMYRA ATOLL Diving and flying at Palmyra Atoll. Palmyra Atoll, 950 miles south of Hawaii, is a National Fish and Wildlife Refuge where fishing is not allowed within the 12-mile Refuge boundary. Consequently, the fish life in the area is incredible. We’d done several dives there and were amazed at the abundance, health and diversity of the fish andcoral
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
LINUX/APACHE ON ARM PROCESSORS That web site is hosted on 7 servers, each running the following: · Single 1.2Ghz ARM processor, Marvell MV78100. · 1 disk. · 1.5 GB DDR2 with ECC! · Debian Linux. · Nginx web proxy/load balancer. · Apache web server. Note that, unlike Intel Atom based servers, this ARM-based solution has the full ECC memory support we want in server YOU REALLY DO NEED ECC MEMORY Hey William, good hearing from you. And, yeah, I totally agree that needing ECC is a unfortunate constraint in server purchases. But, there are two ways to get rid of the constraints: 1) develop systems that can operate correctly in the presence of massive datapath and memory errors or 2) convince client system buyers and builders they need ECC for the same reasons that server and embedded VALVE SEAT RECESSION Valve Seat Recession. About four weeks ago, our generator suddenly went from normal output to having far less power. Instead of the 10+ kW it normally produced, it could only generate 7 kW. We worked through the Northern Lights diagnostic procedure and concluded we had a valve or valve seat problem on #3 cylinder exhaust.SCANIA SITE VISIT
Scania Site Visit. In the 27th edition of our Technology Series, we visit the Scania manufacturing plant at Sodertalje, Sweden near Stockholm. Scania is famous for producing modular engines with excellent fuel economy and power-to-weigh ratios. We’ve seen their beautiful trucks and buses throughout Europe, and they have aparticularly loyal
MAINTENANCE LOG
The log contains one entry per service item, where each item has an associated number of hours and/or number of months between service intervals. For example, in the screenshot below, the cells highlighted in blue indicate the main engine oil and filter are due to be changed every 6 months or 375 hours. This information is entered per serviceBERENDRECHT LOCK
Position: 51°20.77’N, 4°16.89’E. The 442-ft (135m) chemical barge Thalys exiting the Zandvliet lock adjacent to the Berendrecht lock. The Zandvliet lock is 1,600ft (1/2 km) long, 187 ft (57m) wide and 44 ft (13.5 m) deep and was the largest lock in the world when opened in 1967. It was superseded by the Berendrecht lock in 1988,that is
MARETRON N2KVIEW ON DIRONA This displays fuel tank levels of the four fuel tanks on Dirona. We use this data when transferring fuel and, during engine room checks, we can check this data against the sight gauges. Below is a list of all the physical devices on our NMEA 2000 bus. Much of the Maretron N2KView displays are based on input from these devices. 13.2 KW ALTERNATORS AND BEYOND 13.2 kW Alternators and Beyond. On Dirona, we aim to always run the boat using a single power source. When we are plugged into shore, we aim to drive the entire boat off of shore-side power and never run the generator. This may sound easy, but in Europe you frequently won’t find more than a 16A shore power service and we have been at marinas THE SECRET COAST: SUQUASH It is an easy walk from the beach at Suquash to see the ruins, and they are extraordinary. The first ones we found were huge shovels, perhaps four metres high. Farther along was a metal wheel with one-meter spokes. To the south, and closer to shore, were the ruins of the foreman’s house. Two intact river-rock chimneys soar skyward,blending
JOHN DEERE 6068AFM75 It’s a John Deere 6068AFM75 M2. The standard engine in the Nordhavn 47 and 52 series is a Lugger L1066T.2 with a ZF220A gearbox. Both are great, long lasting components. We chose to move to the John Deere 6068 to get a bit more horsepower, a closer to continuous rating, and increased fuel efficiency. On the horsepower front, we moved from the DUNDAS BAY WEST ARM, SE ALASKA The fog cleared as we neared Dundas Bay. The passage through the main arm passes by many small islets and extensive mud flats, with mountains visible in the distance. With calm seas and a blue sky developing, we had a relaxing cruise up the bay. We weren't sure whether to take the west or the east arm. We could see reasonableanchoring depths
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing DIRONA AROUND THE WORLD Secret Coast. Our cruising guide, Waggoner sister publication Cruising the Secret Coast, is available at local bookstores and online. Click book image for details. Home. Destinations. Europe. Belgium. Denmark. MV DIRONA RECENT LOCATIONS TRAVEL LOG MAP Recent log entries Subscribe Auto-update Loading . Loading mapFINNAFJORDEN
Spectacular Finnafjorden ("the hidden fjord") is a branch of Sognefjord, Norway's longest and deepest fjord. While Finnafjorden is one of the shortest arms of Sognefjord, what it lacks in length it makes up for in amazing scenery. Particularly impressive is nearly landlocked Finnabotn, where 4,000-ft (1,200 m) mountains encircle the bay, giving the feel ofROMSDALSFJORDEN
Romsdalsfjorden. At 46 nautical miles long, Romsdalsfjorden is the ninth-longest fjord in Norway. The fjord forks into three main branches at the island of Veoya, once the main medieval trading center between Trondheim and Bergen where the 12th-century Medieval Church of St. Peter still stands. The three main branches stretch past the townsof
MAINTENANCE LOG
The log contains one entry per service item, where each item has an associated number of hours and/or number of months between service intervals. For example, in the screenshot below, the cells highlighted in blue indicate the main engine oil and filter are due to be changed every 6 months or 375 hours. This information is entered per service UPDATING THE MAINTENANCE LOG Updating the Maintenance Log. A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairly easy to add new maintenance items for a givenpiece of
ANANDTECH ON AWS GRAVITON2 Anandtech on AWS Graviton2. Yesterday, Anandtech published what is, by far, the most detailed write-up on the AWS Graviton2 processor. In this article the author, Andrei Frumusanu, compared the Graviton2 with the AMD EPYC 7571 and the Intel Platinum 8259CL. Worth reading. From Anandtech: Amazon’s Arm-based Graviton2 Against AMD and Intel FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpitPERSPECTIVES
Reinventing Operational Resiliency. The cloud helps organizations achieve unmatched resiliency at scale. This is a quick write-up I SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
DIRONA AROUND THE WORLD Secret Coast. Our cruising guide, Waggoner sister publication Cruising the Secret Coast, is available at local bookstores and online. Click book image for details. Home. Destinations. Europe. Belgium. Denmark. MV DIRONA RECENT LOCATIONS TRAVEL LOG MAP Recent log entries Subscribe Auto-update Loading . Loading mapFINNAFJORDEN
Spectacular Finnafjorden ("the hidden fjord") is a branch of Sognefjord, Norway's longest and deepest fjord. While Finnafjorden is one of the shortest arms of Sognefjord, what it lacks in length it makes up for in amazing scenery. Particularly impressive is nearly landlocked Finnabotn, where 4,000-ft (1,200 m) mountains encircle the bay, giving the feel ofROMSDALSFJORDEN
Romsdalsfjorden. At 46 nautical miles long, Romsdalsfjorden is the ninth-longest fjord in Norway. The fjord forks into three main branches at the island of Veoya, once the main medieval trading center between Trondheim and Bergen where the 12th-century Medieval Church of St. Peter still stands. The three main branches stretch past the townsof
MAINTENANCE LOG
The log contains one entry per service item, where each item has an associated number of hours and/or number of months between service intervals. For example, in the screenshot below, the cells highlighted in blue indicate the main engine oil and filter are due to be changed every 6 months or 375 hours. This information is entered per service UPDATING THE MAINTENANCE LOG Updating the Maintenance Log. A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairly easy to add new maintenance items for a givenpiece of
ANANDTECH ON AWS GRAVITON2 Anandtech on AWS Graviton2. Yesterday, Anandtech published what is, by far, the most detailed write-up on the AWS Graviton2 processor. In this article the author, Andrei Frumusanu, compared the Graviton2 with the AMD EPYC 7571 and the Intel Platinum 8259CL. Worth reading. From Anandtech: Amazon’s Arm-based Graviton2 Against AMD and Intel FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpitPERSPECTIVES
Reinventing Operational Resiliency. The cloud helps organizations achieve unmatched resiliency at scale. This is a quick write-up I SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
ROMSDALSFJORDEN
Romsdalsfjorden. At 46 nautical miles long, Romsdalsfjorden is the ninth-longest fjord in Norway. The fjord forks into three main branches at the island of Veoya, once the main medieval trading center between Trondheim and Bergen where the 12th-century Medieval Church of St. Peter still stands. The three main branches stretch past the townsof
AZORES ARRIVAL
We got our first glimpse to the Azores archipelago on the morning after our eighth night after departing Dublin. We reached the port of Horta shortly after day break and proceeded to our berth in the commercial harbour, with views to the historic town on the opposite shore. The protocol for pleasure craft arriving intoMV DIRONA
MV Dirona. Dirona is a Nordhavn 52 produced by Pacific Asian Enterprises. It's an ocean-capable recreational boat with a range of 2,500 nautical miles and, with the addition of deck fuel, its range extends out to 4,000 nautical miles. We have crossed all oceans andthe Atlantic twice.
RIVER LIFFEY
The River Liffey runs through the center of Dublin and has long been a source of water, recreation and commerce for the city. Trade along the river was recorded as early as the Viking days and the first bridge across was built in 1428. Up until the 1990s, cargo ships transported Guinness for export fromJAMES HAMILTON
James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling. Prior to AWS, James was architect on the Microsoft Data Center Futures team and before that he was architect on the Live Platform Services team. Prior to that he was General Managerof
FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpitSTORNOWAY ARRIVAL
Stornoway Harbour was only the second marina we've stopped at since arriving in Scotland two months ago, and again we weren't the only Nordhavn there. At James Watt Dock Marina near Glasgow, Nordhavn 55 Odyssey was moored behind us. At Stornoway, Nordhavn 68 Vesper was one pontoon away from us. We spent the afternoon of JOHN DEERE 6068AFM75 It’s a John Deere 6068AFM75 M2. The standard engine in the Nordhavn 47 and 52 series is a Lugger L1066T.2 with a ZF220A gearbox. Both are great, long lasting components. We chose to move to the John Deere 6068 to get a bit more horsepower, a closer to continuous rating, and increased fuel efficiency. On the horsepower front, we moved from the AIR TRAFFIC CONTROL SYSTEM FAILURE & COMPLEX SYSTEM Returning to the two other causes of complex system failure I mentioned earlier: 1) the impact of black swan events and 2) compounding changes in environmental conditions. Much time gets spent on how to mitigate the negative impact of rare and difficult to predict events. The former are, by definition, very difficult to adequately predict so LINUX/APACHE ON ARM PROCESSORS That web site is hosted on 7 servers, each running the following: · Single 1.2Ghz ARM processor, Marvell MV78100. · 1 disk. · 1.5 GB DDR2 with ECC! · Debian Linux. · Nginx web proxy/load balancer. · Apache web server. Note that, unlike Intel Atom based servers, this ARM-based solution has the full ECC memory support we want in server DIRONA AROUND THE WORLD Secret Coast. Our cruising guide, Waggoner sister publication Cruising the Secret Coast, is available at local bookstores and online. Click book image for details. Home. Destinations. Europe. Belgium. Denmark. VALVE SEAT RECESSION Valve Seat Recession. About four weeks ago, our generator suddenly went from normal output to having far less power. Instead of the 10+ kW it normally produced, it could only generate 7 kW. We worked through the Northern Lights diagnostic procedure and concluded we had a valve or valve seat problem on #3 cylinder exhaust. UP THE WEST COAST OF VANCOUVER ISLAND Up the West Coast of Vancouver Island. It wasn't until last summer that we even entertained the prospect of cruising the west coast of Vancouver Island. It's completely exposed to the Pacific Ocean and receives some really nasty weather. Even on very good days there is a constant ocean swell, and on very bad days ships go down and lives arelost.
UPDATING THE MAINTENANCE LOG Updating the Maintenance Log. A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairly easy to add new maintenance items for a givenpiece of
JAMES HAMILTON
James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling. Prior to AWS, James was architect on the Microsoft Data Center Futures team and before that he was architect on the Live Platform Services team. Prior to that he was General Managerof
FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit DIVING AND FLYING AT PALMYRA ATOLL Diving and flying at Palmyra Atoll. Palmyra Atoll, 950 miles south of Hawaii, is a National Fish and Wildlife Refuge where fishing is not allowed within the 12-mile Refuge boundary. Consequently, the fish life in the area is incredible. We’d done several dives there and were amazed at the abundance, health and diversity of the fish andcoral
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
LINUX/APACHE ON ARM PROCESSORS That web site is hosted on 7 servers, each running the following: · Single 1.2Ghz ARM processor, Marvell MV78100. · 1 disk. · 1.5 GB DDR2 with ECC! · Debian Linux. · Nginx web proxy/load balancer. · Apache web server. Note that, unlike Intel Atom based servers, this ARM-based solution has the full ECC memory support we want in server DIRONA AROUND THE WORLD Secret Coast. Our cruising guide, Waggoner sister publication Cruising the Secret Coast, is available at local bookstores and online. Click book image for details. Home. Destinations. Europe. Belgium. Denmark. VALVE SEAT RECESSION Valve Seat Recession. About four weeks ago, our generator suddenly went from normal output to having far less power. Instead of the 10+ kW it normally produced, it could only generate 7 kW. We worked through the Northern Lights diagnostic procedure and concluded we had a valve or valve seat problem on #3 cylinder exhaust. UP THE WEST COAST OF VANCOUVER ISLAND Up the West Coast of Vancouver Island. It wasn't until last summer that we even entertained the prospect of cruising the west coast of Vancouver Island. It's completely exposed to the Pacific Ocean and receives some really nasty weather. Even on very good days there is a constant ocean swell, and on very bad days ships go down and lives arelost.
UPDATING THE MAINTENANCE LOG Updating the Maintenance Log. A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairly easy to add new maintenance items for a givenpiece of
JAMES HAMILTON
James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling. Prior to AWS, James was architect on the Microsoft Data Center Futures team and before that he was architect on the Live Platform Services team. Prior to that he was General Managerof
FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit DIVING AND FLYING AT PALMYRA ATOLL Diving and flying at Palmyra Atoll. Palmyra Atoll, 950 miles south of Hawaii, is a National Fish and Wildlife Refuge where fishing is not allowed within the 12-mile Refuge boundary. Consequently, the fish life in the area is incredible. We’d done several dives there and were amazed at the abundance, health and diversity of the fish andcoral
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
LINUX/APACHE ON ARM PROCESSORS That web site is hosted on 7 servers, each running the following: · Single 1.2Ghz ARM processor, Marvell MV78100. · 1 disk. · 1.5 GB DDR2 with ECC! · Debian Linux. · Nginx web proxy/load balancer. · Apache web server. Note that, unlike Intel Atom based servers, this ARM-based solution has the full ECC memory support we want in server MV DIRONA RECENT LOCATIONS TRAVEL LOG MAP Recent log entries Subscribe Auto-update Loading . Loading mapFINNAFJORDEN
Spectacular Finnafjorden ("the hidden fjord") is a branch of Sognefjord, Norway's longest and deepest fjord. While Finnafjorden is one of the shortest arms of Sognefjord, what it lacks in length it makes up for in amazing scenery. Particularly impressive is nearly landlocked Finnabotn, where 4,000-ft (1,200 m) mountains encircle the bay, giving the feel ofELDOY ISLANDS
Position: 59°54.41’N, 5°16.02’E. View to Dirona in the Eldoy islands as we set out on a tender tour through the myriad islands and complex waterways in the area. Litleholmen. Position: 59°55.19’N, 5°14.17’E. Colorful summer cabins in the sheltered cove Litleholmen at the northern end of the island of Ivarsoy.MAINTENANCE LOG
The log contains one entry per service item, where each item has an associated number of hours and/or number of months between service intervals. For example, in the screenshot below, the cells highlighted in blue indicate the main engine oil and filter are due to be changed every 6 months or 375 hours. This information is entered per service FUEL FOR THE CROSSING Fuel for the crossing. Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit DUNDAS BAY WEST ARM, SE ALASKA The fog cleared as we neared Dundas Bay. The passage through the main arm passes by many small islets and extensive mud flats, with mountains visible in the distance. With calm seas and a blue sky developing, we had a relaxing cruise up the bay. We weren't sure whether to take the west or the east arm. We could see reasonableanchoring depths
THE SECRET COAST: SUQUASH It is an easy walk from the beach at Suquash to see the ruins, and they are extraordinary. The first ones we found were huge shovels, perhaps four metres high. Farther along was a metal wheel with one-meter spokes. To the south, and closer to shore, were the ruins of the foreman’s house. Two intact river-rock chimneys soar skyward,blending
JOHN DEERE 6068AFM75 It’s a John Deere 6068AFM75 M2. The standard engine in the Nordhavn 47 and 52 series is a Lugger L1066T.2 with a ZF220A gearbox. Both are great, long lasting components. We chose to move to the John Deere 6068 to get a bit more horsepower, a closer to continuous rating, and increased fuel efficiency. On the horsepower front, we moved from the BEHIND THE SCENES ON THE WESTERDAM Behind the Scenes on the Westerdam. We love technology, how things work, and digging in behind the scenes and so an important part of our trip around the world in a small boat has included stops to tour ice breakers, mines, manufacturing plants, container ships. We even tried our hands at the helm of a 5,000 HP tractor tug. AIR TRAFFIC CONTROL SYSTEM FAILURE & COMPLEX SYSTEM Returning to the two other causes of complex system failure I mentioned earlier: 1) the impact of black swan events and 2) compounding changes in environmental conditions. Much time gets spent on how to mitigate the negative impact of rare and difficult to predict events. The former are, by definition, very difficult to adequately predict so DIRONA AROUND THE WORLD 4 years ago strapped to a dialysis chair I found your site and followed your progress around northern europe. Your adventures relieved the tedium of dialysis every second day MV DIRONA RECENT LOCATIONS TRAVEL LOG MAP Recent log entries Subscribe Auto-update Loading . Loading mapSCANIA SITE VISIT
In the 27th edition of our Technology Series, we visit the Scania manufacturing plant at Sodertalje, Sweden near Stockholm. Scania is famous for producing modular engines with excellent fuel economy and power-to-weigh ratios. We've seen their beautiful trucks and buses throughout Europe, and they have a particularly loyal and happy customers base. We've stopped to VALVE SEAT RECESSION About four weeks ago, our generator suddenly went from normal output to having far less power. Instead of the 10+ kW it normally produced, it could only generate 7 kW. We worked through the Northern Lights diagnostic procedure and concluded we had a valve or valve seat problem on #3 cylinder exhaust. The steps we UPDATING THE MAINTENANCE LOG A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairlyJAMES HAMILTON
Bio: James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling.MAINTENANCE LOG
On our previous boat, we were (just barely) able to remember when all mechanical systems needed service as the hours mounted and time passed. But that system broke down when we got the current boat. There are far more systems, many of the intervals vary greatly, and when running offshore, up-to-date service is even more FUEL FOR THE CROSSING Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit bladder tanksfor that run.
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
DIRONA AROUND THE WORLD 4 years ago strapped to a dialysis chair I found your site and followed your progress around northern europe. Your adventures relieved the tedium of dialysis every second day MV DIRONA RECENT LOCATIONS TRAVEL LOG MAP Recent log entries Subscribe Auto-update Loading . Loading mapSCANIA SITE VISIT
In the 27th edition of our Technology Series, we visit the Scania manufacturing plant at Sodertalje, Sweden near Stockholm. Scania is famous for producing modular engines with excellent fuel economy and power-to-weigh ratios. We've seen their beautiful trucks and buses throughout Europe, and they have a particularly loyal and happy customers base. We've stopped to VALVE SEAT RECESSION About four weeks ago, our generator suddenly went from normal output to having far less power. Instead of the 10+ kW it normally produced, it could only generate 7 kW. We worked through the Northern Lights diagnostic procedure and concluded we had a valve or valve seat problem on #3 cylinder exhaust. The steps we UPDATING THE MAINTENANCE LOG A few years back we posted the Excel-based spreadsheet we wrote for our maintenance log, along with instructions on how to use it. The spreadsheet has continued to serve us well, and still is our main tool for managing maintenance items. While it’s fairlyJAMES HAMILTON
Bio: James is a Vice President and Distinguished Engineer on the Amazon Web Services team where he is focused on infrastructure efficiency, reliability, and scaling.MAINTENANCE LOG
On our previous boat, we were (just barely) able to remember when all mechanical systems needed service as the hours mounted and time passed. But that system broke down when we got the current boat. There are far more systems, many of the intervals vary greatly, and when running offshore, up-to-date service is even more FUEL FOR THE CROSSING Dirona carries 1735 gallons of diesel for the main engine: 835 gallons in each side tank and 65 gallons in the day tank. (We also have a 10-gallon supply tank for the auxiliary engine). Although 1735 gallons would have been fine for the roughly 2,000nm trip between San Francisco and Hawaii, we added 532 gallons in cockpit bladder tanksfor that run.
BATTERY CABINET HARDWARE V1 6 April 7, 2011 aisle temperature is not predictable. The maximum temperature of the hot aisle (back of the cabinet where outlet air slots are) is +45°C (+113°F). There is an air pressure gradient between the front of the cabinet and the back causing SMITH SURPRISES INLET Smith is the southernmost of two inlets that branch from the mouth of Smith Sound, directly north of Cape Caution. After exploring BoswellInlet
SCANIA SITE VISIT
In the 27th edition of our Technology Series, we visit the Scania manufacturing plant at Sodertalje, Sweden near Stockholm. Scania is famous for producing modular engines with excellent fuel economy and power-to-weigh ratios. We've seen their beautiful trucks and buses throughout Europe, and they have a particularly loyal and happy customers base. We've stopped toMV DIRONA
More information at: Nordhavn 52 Dirona is powered by an M2-rated John Deere 6068AFM75 IMO Tier II emissions engine producing 266 hp. We are equipped with an emergency get-home engine manufactured by Northern Lights, a Lugger L844D, producing 40hp.The boat has a single generator, also from Northern Lights, a Northern Lights M843NW3.3 12kw single phase generator (50A@240V). TECHNICAL – DIRONA AROUND THE WORLD While our cruising lifestyle may be on pause during the Scottish lockdown, our maintenance log isn’t. Several scheduled service items came due in mid-May, including annual testing, lubricating and changing the oil and filter in our gasoline engines, changing the hydraulic zincs, and charging our backup batteries. UP THE WEST COAST OF VANCOUVER ISLAND The west coast is divided into five large sounds that indent the island: Barkley, Clayoquot, Nootka, Kyuquot, and Quatsino. The typical trip consists of a series of exposed coast runs between them, with several days spent within each one. NORDHAVN - DIRONA AROUND THE WORLD Nordhavn 5263. Our most recent Nordhavn-specific posts are here. Cruising. 69.1 degrees (heel-over to 69.1 degrees at the Wide Bay Bar); On the hard at Norsand Boatyard; Hilo to Honolulu (tropical cruising) ; From Hawaii to French Polynesia (fuel economy); Cruising Prince William Sound STEELHEAD WIRELESS REMOTE We've had three pendants fail on our Steelhead Marine crane over the last 9 years. The proportional switch proximity sensor is very fragile but there are other failure points as well. These pendants cost just under $1000 each, so we really needed a longer lasting and more economical solution. Steelhead does sell a remote-control for thiscrane,
JOHN DEERE 6068AFM75 Last Friday I visited the engine for our new boat (next boat). It’s a John Deere 6068AFM75 M2. The standard engine in the Nordhavn 47 and 52 series is a Lugger L1066T.2 with a ZF220A gearbox. Both are great, long lasting components. We chose to move to the John Deere 6068 toget a bit
DUNDAS BAY WEST ARM, SE ALASKA Cruising Southeast Alaska: Dundas Bay West Arm Porcupine Bay was our last stop on the west side of Chichagof Island--we would spend the next week in Glacier Bay National Park. We still had two more days before we could enter the permit-only portion of the park, but we planned to spend a night or two in Dundas Bay first.PERSPECTIVES
Reinventing Operational Resiliency. The cloud helps organizations achieve unmatched resiliency at scale. This is a quick write-up I LINUX/APACHE ON ARM PROCESSORS In The Case for Low-Cost, Low-Power Servers, I made the argument that the right measures of server efficiency was work done per dollar and work done per joule.Purchasing servers on single dimensional metrics like performance or power or even cost alone, makes no sense at all. Single dimensional purchasing leads to micro-optimizations that push one dimension to the detriment of others.* __
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Map data ©2021 Google Imagery ©2021 , Maxar Technologies, U.S. Geological Survey, USDA Farm Service AgencyRecent highlights
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5/27/2021: _Dirona_'s first sunset in the US since departing Newportin May of 2017.
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* James Hamilton on General Comments * Duane on General Comments * James Hamilton on Charleston Arrival * James Hamilton on General Comments * James Hamilton on Charleston ArrivalRECENT POSTS
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SECRET COAST
Our cruising guide, Waggoner sister publication _Cruising the Secret Coast_ , is available at local bookstores and online. Click book image for details.LATEST POSTS
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02 Jun
CHARLESTON ARRIVAL
Photo courtesy Pierce and Janet Guyer We completed the final leg of our passage from Horta to ...*
25 May
INTO THE STORM
In determining our route from Ireland to Charleston this May, we had a number of choices. The ...*
24 May
AZORES HIGH
The most direct route from the Azores to the US is an 1,800-mile great circle route to Bermuda ...*
23 May
HORTA
Horta has long been a stopover for ships crossing the Atlantic Ocean. Explorers and settlers ...*
21 May
AZORES ARRIVAL
We got our first glimpse to the Azores archipelago on the morning after our eighth night after ...*
16 May
IRELAND TO AZORES
In late April, we continued our journey home with a 1,330-mile, 8-day run from Ireland to the ...*
13 May
DUN LAOGHAIRE
Our second visit to Dun Laoghaire marina outside Dublin was as enjoyable as the first. In the ...*
05 May
RIVER LIFFEY
The River Liffey runs through the center of Dublin and has long been a source of water, ...*
02 May
DALKEY
Dun Laoghaire harbour was constructed in the early 1800s from stone quarried at nearby Dalkey. ...*
24 Apr
DUBLIN ARRIVAL
After spending two weeks at Strangford Lough in Northern Ireland, we departed on the last of ...*
22 Apr
QUOILE RIVER
For our third and final anchorage in Strangford Lough, we returned south from Mahee Island and ...*
21 Apr
MAHEE ISLAND
After three nights moored off Chapel Island, we moved to the northern end of Strangford Lough ...*
17 Apr
CHAPEL ISLAND
We anchored for three nights off Chapel Island just inside Strangford Lough, NI in wonderfully ...*
16 Apr
NORTHERN IRELAND ARRIVAL The 225-mile overnight run from Scalpay to Strangford Lough in Northern Ireland started and ...*
15 Apr
STORNOWAY DEPARTURE
We departed Stornoway at the end of March for Northern Ireland. With the area’s frequent ...*
14 Apr
STORNOWAY
Our first visit to Stornoway in 2018 was only for a week. We hit the highlights of the town and ...*
13 Apr
PERIMETER TRAIL
Our final walk in Stornoway was also on the Lews Castle grounds, this time along the Perimeter ...*
12 Apr
LEWS CASTLE GROUNDS
Sir James and Lady Matheson created the Lews Castle and its grounds over a period of seven ...NEXT __
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RECENT GENERAL COMMENTS AND QUESTIONS (VIEW ALL)
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Duane says:
June 5, 2021 at 6:09 pm Welcome back James and Jennifer. Michelle and I are about to move aboard a boat on the east coast, VA. We look forward to catching up again in the near future to chat about your adventures.Reply
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James Hamilton says: June 5, 2021 at 7:22 pm Wow, that’s great to hear. What boat did you guys buy?Reply
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HARRY HALL says:
June 5, 2021 at 12:45 am Welcome home. Thank you for sharing so much in you interesting, educational and all around enjoyable videos.Reply
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James Hamilton says: June 5, 2021 at 10:02 am Thanks very much for the feedback on the blog and the YouTube channel (https://www.youtube.com/user/mvdirona).Reply
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Timothy Daleo says:
June 4, 2021 at 3:50 pm Now that you have had some time to settle in and restock, have you been able to find time to track down the source of the exhaust leakand the belt issue?
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James Hamilton says: June 4, 2021 at 5:41 pm Yes, the exhaust leak is actually from two connections that have opened up over the years with the bolts apparently just backing off and the gaskets failing as a consequence. We took off all the insulating cladding a few days back and found the lower flange of the wrinkle belly (flex coupling) is leaking and the next flange below that one is also very loose and leaking even more. In both cases the nuts and bolts below the exhaust cladding appear to have backed off and those two flanges have started to leak. I’ve got some gaskets on order and they should be there today. I’ll re-install the exhaust parts and properly torque them. The exhaust cladding is getting a bit tired from years of use so we may drop off the two warn pieces to see if we can get new ones made at Ballard Insulation since they did the original parts. The hard part of this job is cleaning up the light coating of soot all over all the engines and flat surfaces in the engine room. It’s a bit of a mess and some of it has been ground into the floor of the Engine Room so it’ll take some work to get everything clean again but it’s all solvable without much complexity. Just some work.Reply
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Shaun says:
June 4, 2021 at 2:06 am I apologize if this has been covered before, but do you have a GitHub (or similar) for the code you written over time? We recently purchased a 57 and would love to get the nmea data flowing in to a database. I thought before I reinvent the wheel I would see if you are sharingyour code anywhere.
Thank you
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James Hamilton says: June 4, 2021 at 9:38 am Great project. It’s super useful to have access to historical data when investigating problems and the database makes it easy to write reporting and alerting functions as well. Our system has evolved over the years and is specific to this boat electrical and electronics architectures but the good news is Kees Verruijt has written a wonderful interface to the NMEA2000 systems called CANboat. It is on Github (https://github.com/canboat/canboat) and that is what we are using. Kees has written a nice clean system that is very reliable.Reply
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Ken toews says:
June 2, 2021 at 10:54 pm 4 years ago strapped to a dialysis chair I found your site and followed your progress around northern europe. Your adventures relieved the tedium of dialysis every second day and made the whole ordeal a bit more pleasant. At 60 plus years I don’t even like boats anymore but in my minds eye I calculated your fuel consumption, followed your repairs, searched the shortest routes, and planned in my head all aspects of a circumnavigation, so thank you, your trip kept me a little sane. I got my transplant 3 years ago in august. All iswell
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James Hamilton says: June 3, 2021 at 11:51 am What a wonderful note to send our way. Thanks for taking the time and congratulations to you to have the kidney transplant successfullybehind you.
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Gregg J Testa says:
June 4, 2021 at 11:23 pm I am grateful, thank you for sharingReply
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James Hamilton says: June 5, 2021 at 9:57 am Thanks for the feedback Gregg.Reply
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Johnson R Waite says: May 28, 2021 at 1:53 pmWelcome Home.
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James Hamilton says: May 29, 2021 at 11:02 am Thanks very much. It’s great to be back. Amazon is now delivering to us by the truck load! It’s been way too long without Amazon Primeaccess :-).
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Gary Cummings says:
May 28, 2021 at 2:35 am Welcome Back!!! What are your cruising plans for this summer? I have really enjoyed following your adventures. Looking forward to the nextchapter.
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James Hamilton says: May 28, 2021 at 10:40 am The first jobs for yesterday were getting vaccination, getting Spitfire to the Vet, and taking the largest Amazon delivery every. Today I’ll investigate an exhaust leak that has sooted our down engine room and see what will be required to correct that issue. And we may go out and get cell phone SIMs as well. I’ve not been physically at work for 18 months so need to spend some serious Seattle time. Aside from that, the adventure should continue to the North. We’re thinking about possibly visiting Greenland next summer and we want to visit the Great Lakes so there should be lots to do.Reply
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Kenneth Lustig says: May 28, 2021 at 1:12 am What an incredible accomplishment with this most recent Atlantic crossing. Do you take a break from boating for dry land or continue onthe adventure?
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James Hamilton says: May 28, 2021 at 10:36 am I’ve not physically been back at work in Seattle for 18 months so will be spending lots time there the remainder of this year. Aside from that, the adventure will continue northward.Reply
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Kenneth Myette says: May 27, 2021 at 11:01 pm Welcome home well done! Make sure to load up on Vitamin D3 before your second jab. Get some restReply
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James Hamilton says: May 28, 2021 at 10:35 am We were somewhat more tired than usual last evening probably as a consequence of the shot and my arm feels a bit sore this morning but, otherwise, no noticeable impact. Thanks for the vitamin recommendation prior to the second shot.Reply
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Steven E Coleman says: May 27, 2021 at 6:49 pm Welcome home Dirona, another Atlantic crossing scratched off the list:)
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James Hamilton says: May 27, 2021 at 7:02 pm Thanks Steve! It’s great to be back. We arrived at 11 and were vaccinated 2 hours later.Reply
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DeeDee says:
May 27, 2021 at 3:17 pm Welcome home..followed you across the Atlantic . ..followed you al lover the place..
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Michael & Frances N4052 says: May 27, 2021 at 4:40 pm Well done!. Third Atlantic crossing. Marvellous.Reply
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James Hamilton says: May 27, 2021 at 6:20 pm Thanks you both and especially thank you for the welcome to Europe you gave us when we arrived, Reeds was great and it was thoughtful to give it to us. It was also fun catching up with you while we were inLondon.
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James Hamilton says: May 27, 2021 at 6:18 pm Thanks! It’s great to be back.Reply
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James 4 says:
May 27, 2021 at 12:28 pmHello James
is the way the belt failed normal hows the jounery goingReply
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James Hamilton says: May 27, 2021 at 6:17 pm No, that belt doesn’t even have a 1,000 hours on it and they normally last several thousand. It was in unusually poor shape. I think it might be a manufacturing defect given that the belt that is on there is now is the same manufacturer purchased at the same time and it has thousands of hours on it. I’ll check the mechanical again very carefully but my current theory is it was a defective belt. Overall, the trip was great. We got in this morning at 11am and have already got vaccinations.Reply
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James 4 says:
May 27, 2021 at 7:24 pm thank you for the information the belt looked like it was on the edge of a pulley in the it could be a manufacturing defect and thats good to hear you’ve arrived at charleston and had your vaccinationsReply
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James 4 says:
May 27, 2021 at 8:32 pm sorry typing error thank you for the information. the belt looked like it’s been on the edge of a pulley looking at the way it’s damaged or it could be a manufacturing defect and as fellow boat owner its good to hear you’ve arrived at charleston and had your vaccinationsReply
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James Hamilton says: May 27, 2021 at 9:45 pm Thanks for the comment. Yes, the belt does look like it wasn’t running in the correct path but it was aligned and central in allpulles.
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Phil Jones says:
May 31, 2021 at 7:09 am Glad to see you made it safely. 25′ waves at a 7 second period makes for an uncomfortable ride and some occasional ‘sugar scooping’ of water over the anchor roller? with regard to your belt issues. The IMO (International Maritime Organisation) mandates the change out off all rubber goods in lifeboats every 5 years. that includes all engine hoses, belts, hydrostatic release diaphragms and i’m constantly changing the ‘O’ rings in the breathing air system regulators. you can imagine that being in what is effectively a ‘sealed container’ in all sorts of weather conditions takes its toll on ‘perishable’ goods. we actually store rubber goods in an air conditioned space. (not on our N57, but my other job)Reply
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James Hamilton says: May 31, 2021 at 11:35 am Big waves on short frequency are never great and this was rough. Fortunately, we diverted far enough south to avoid the larger ways more central to the weather system so we were able to avoid seeing anything as big as 25′. But, it was far from smooth. There is no question that rubber breaks down with age. But, it seems like there is something more going on in this case. When we purchased the boat, we got 2 spare drive belts at the same time so we had three all the same age including the 1 on the engine. The first two went more than 5,000 hours each and they were both replaced looking great with little wear. The third one was ribboned in less than 500 hours and I put one of the used belts (purchased at the same time) back on. The high hour belt that is back on the boat is looking good. There is no question that rubber does age over time and 12 years is excessive but, the failed belt appears that it might have something wrong withit.
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Steven E Coleman says: May 27, 2021 at 2:57 amHello James,
I had to read your belt posts twice, I guess I was speed reading the first go and got to the end and thought “WTF no spare belt?” (Ishould know better)
Anyway 12 years in storage is a rather long time. This hasn’t changed much over the years as you can tell from the pictures, but ithas been updated.
https://safety.gates.com/wp-content/uploads/2016/04/Gates-Corporation-Preventive-Maintenance-Safety-for-Belt-Drives-Guide.pdf Browning has one two but I couldn’t find an easy link and didn’t want to read their entire website.Reply
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James Hamilton says: May 27, 2021 at 6:25 pm I agree with you but the two used belts and the one that just failed are all the same age and the used ones have done nearly 6,000 hours each and yet this one didn’t make it 1,000. I suspect it’s a manufacturing defect or there is some issue with an idler or tensioner that I haven’t yet found.Reply
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Steven E Coleman says: May 27, 2021 at 7:10 pm Possibly but, (granted a photo isn’t the best thing to troubleshoot from), since it didn’t “walk”, split in a linear fashion, and I can see no scuffing on the backside, I would suspect material failure caused by age, temperature or any number of things storage related. Due to the linear failure/ cut (?) I suppose it’s possible a pulley/sheave (not sure what you’d call it on an engine drive) has worn enough to allow the belt to ride deep enough to cut it. You’ve seen enough belts I’m sure you’ll figure it out but the major of the reason I sent that link is if for some reason you are stumped (I’ve been there once or twice over the years) , if you go through the report at the end of the article, It will tell you.Reply
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James Hamilton says: May 28, 2021 at 12:53 pm Wonderful detail. Thanks for sending it. From the article, the two most probable explanations are 1) belt age, and 2) backside idlerproblem.
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Rodney H Sumner says: May 27, 2021 at 12:40 am James: If my memory serves me correctly there was a discussion to utilize a mechanic’s stethoscope to check (listen) to all of the pulley bearings, etc. on this critical belt system. Would this procedure help in this case?Reply
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Timothy Daleo says:
May 27, 2021 at 12:21 am 95 miles to go and I see you are slowing for your 8 am arrival time. It looks like a balmy night with a gentle swell to push you along. Jennifer should see the glow of the lights of the city just after midnight. Is the old belt holding up or showing signs of the same wear? Shelf life exceeded of the “new” belt?Reply
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Timothy Daleo says:
May 27, 2021 at 1:19 pm You are moving really fast now! Trying to hit 9 knots :-) Welcome backto the US!
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James Hamilton says: May 27, 2021 at 6:18 pm We were basically pushing it at full output. We were slowed a bit by the gulf stream with 20 kts of wind so were pushing to catch up since we have vaccination appointments today.Reply
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James Hamilton says: May 27, 2021 at 6:14 pm It should have been really nice but the combination of 20 kts of wind and the gulf stream did kick things up quite a bit and we running very slowly crabbing across the gulf stream so ended up delayed by a couple of hours. It’s great to be back. The old belt is looking great so I suspect we either have a manufacturing defect or excess age. Given that all the belt that is on there now is the same age and it’s done several thousand hours, I suspect we had a manufacturing defect. However, I’ll check all the mechanical systems very carefully to ensure there isn’t some other problem shortening the belt life. I’m pretty sure it’s all fine.Reply
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Rodney H Sumner says: May 25, 2021 at 8:00 pm James and Jennifer: With the constant head wind can you actually smell land, not just figuratively? :) :)Reply
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James Hamilton says: May 25, 2021 at 8:05 pm It is starting to feel close. We’re hard at work yesterday and today making appointments, ordering things we need since we haven’t been in the US for 18 months, and planning the next month. It is starting to feel like land is near. Only 292 miles to go!Reply
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Rodney H Sumner says: May 25, 2021 at 12:35 am James: Did all of the steps taken to prevent water entering the bilge through the shore power cable system work as planned? I think this was your worst weather since your crossing to IrelandReply
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James Hamilton says: May 25, 2021 at 12:51 am Good point Rod. This has been the most weather we’ve seen for a while. The boats been nice and dry and has more or less just shrugged off the weather without issue. The bilge is bone dry just the way welike it.
It’s amazing how little stress the weather brings when all systems are running as designed and there is nothing to worry about. It’sall much easier!
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Rodney H Sumner says: May 24, 2021 at 2:43 pm James and Jennifer: Great to see the sea state is more settled! With the very understandable laser focus on fuel economy, fuel reserves, etc. how are the engine rpm’s adjusted when, for example, “driving to the lights”? Given Dirona’s very high degree of automation/monitoring is it safe to assume that engine speed is adjusted automatically? If so how often do you ‘intervene’ manually. As you know I have been following your blog for years and I cannot recall this topic ever being covered. Safe sailing to SC!Reply
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James Hamilton says: May 24, 2021 at 5:02 pm I agree. It’s great to have more settled weather! The drive-to-the-lights system shows green in the -5% to +5% range around the currently computed required fuel economy. Providing a range means that the engine RPM seldom needs to be adjusted. And, since the range is fairly narrow, it’s still quite accurate. Rod, you’ll be disappointed to learn that the connection between the drive-to-the-lights system and the main engine is only via a human:-).
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Alec Peterson says:
May 24, 2021 at 2:41 pm You seem to have synthesized a number of metrics on your N2K bus (such as max pitch/roll over a time period, total of all of your fuel tanks,etc).
This behavior sounds functionally like “N2K Metric Math”. Did you have to assemble all of this software yourself, gluing together things like CANBoat with Python or something simlar? Or is there a package that streamlines the ability to compose a new N2K metric out of a few other parts? If not, feels like it might be an interesting summer open source project to take on…Reply
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James Hamilton says: May 24, 2021 at 4:52 pm Mostly, these NMEA2000 values are hand crafted. Overtime Maretron adds more of the common ones. For example, I think they do have total fuel but for many of them, they are synthesized. My take is that, for all but the important ones, it’s more work than is really justified to produce these synthesized PGNs. However, even though I claim it’s not worth the hassle, something like a 1/4 of the display in Dirona is synthesized data :-). I do use CANboat on Dirona and it’s wonderful. Super well written. The CANboat author, Kees Verruijt, now recommends SignalK and I believe that’s mostly what Keese is currently using on his boat.Reply
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Peter Merritt says:
May 23, 2021 at 10:55 pm You both now have extensive experience in passage making as a couple, can you outline your current approach to watch keeping, thanks PeterReply
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James Hamilton says: May 23, 2021 at 11:55 pm Our approach to 24×7 operation with a crew of 2 has evolved into an unusual approach but where it started was pretty conventional: 4 hours on, 4 hours off. We ran on that model for 2 years and it worked fine. But there were downsides. The biggest downside is we never saw each other. When you are running 4 hours on 4 hours off with a two person crew, your tired and there really isn’t time to talk so it feel sort of like you are alone on the boat. We really didn’t like that. A closely related problem is we’re always tired. Never dangerously so but just always quite tired. This isn’t ideal under any conditions but, in the few times we have run into mechanical problems, being tired removes some safety margin while you work issues. Overall, 4 on 4 off is conventional, functional, but neither enjoyable nor likely the safest solution for a 2 person crew. Where we ended up is weird but it solved just about every problem we had with the previous shift schedule. Jennifer takes the helm from 10pm and runs all the way through to 5am. I take the helm from 5am all the way through to 10pm. Jennifer has by far the most difficult shift but it gets me 7 hours of sleep in a single session and I find that I’m just feel the same as a normal working day. If the boat needs some work, I’m always fresh and I can do it. For example, when underway in the South Atlantic on route to Barbados I changed the Stabilizer hydraulic actuator. It wasn’t a problem but it would have been challenging if operating 4 on, 4 off. This shift structure forces Jennifer to sleep in two shifts rather than 1 which would be far better. But, she can sleep as much as she wants on either side. She usually sleeps 6pm to 10pm and 5am until she wakes up. If she’s tired earlier she can start the first sleep cycle an hour or two earlier or extend the second sleep cycle longer. This is a hard shift for Jennifer as standing watch at night is far harder than during the day but she finds she isn’t tired on this schedule. For example, after 28 days at sea traveling 3,650 nautical miles from St. Helena to Barbados, we arrived in at 7am, tied off the boat and spent the day exploring. On this sleep schedule, we’re never running behind with sleep debt and the travel becomes more enjoyable rather than feeling like work. We get lunch and dinner together and spend afternoonstogether.
We love it but it’s unconventional and clearly not a shift cycle foreveryone.
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