success ... well done .... it goes forwards and backwards on command now .... thx for the share .. as always .. never stop dreaming, ust dream bigger .... have fun be safe, save our oceans ......
Yeah, save our oceans. It’s great they don’t have a polluting engine that uses petroleum products like a fiberglass hull, Dacron sails, polyester rope. And besides, a sailboat is absolutely a necessary form of travel.
We don’t have a blog with all the info on it. High level over view, we have an Ericson 39, weights 22,000lbs, 30’ water line, drafts 6’, 19.2 kW of batteries, battery banks is 48v, the motor is AC-34 from HPEVS, both motor and t gear reduction plate were purchased through Thunderstruckev. Hope this helps if you have additional questions feel free to ask.
Howdy! I tried to write down the speed/input powers I heard you two mention in the video, which is super helpful. My boat that I am converting is fairly similar (C&C Landfall 38), my LWL is 9.2m, yours is 9.14m if Sailboatdata is accurate. My displacement is 7.6 tonne dry to your 8.6 tonne. I've got a 10kw motor on order, and I got the Kelly controller, but all in all pretty similar specs. I've been trying to figure out what RPM I want to optimise my prop for (430mm Ecoprop 3-blade) for max range, which is why I was so fascinated by the numbers. May I ask? You mentioned in the video that you have (had?) a two-blade feathering prop, so no regen, what diameter is it? That you were getting 4kts at 1.8kw is really really encouraging! Have you done follow-up / longer range tests to dial in your power/speed curve? Super interesting, thanks!!
We have a old gorri 2 blade folding prop. The prop doesn’t allow regen as it folds back while sailing. The day we did the testing there was a slight breeze and I think it skewed some of the numbers. We purchased our motor through Thunderstruckev and they have an excel spreadsheet ( www.thunderstruck-ev.com/10kw-brushless-sailboat-kit-sevcon.html in the manuals and downloads section) that is fairly accurate in estimating power usage while motoring. Used it for both this boat and our previous boat. Using real world data and spreadsheet this is my finding 1 kt - .04kW, 2kts - .31kW, 3kts - 1.05kW, 4kts - 2.45kW, 5kts - 4.79kW, 6kts - 8.38kW. My struggle is motor testing and data collection isn’t as fun as sailing so haven’t taken in lots of data. If you have additional questions feel free to ask!
@@SVBombadil Thanks for that! What's the diameter of your prop? I'm really hoping the Autoprop Ecostar will be worth the cost... On paper though; It's designed for electric, and the blades flip 180 degrees to get optimal regen (and astern power). Next question; How is yout thrust bearings setup? I want to make sure the pulleys are forward of the thrust bearing to make it easy to swap belts. Thanks!!
@@SVBombadil Looking at your numbers, it looks like the sweet spot between speed and power is ~4kts. Is this where you tend to cruise at? If my math is right (400Ah at 51.2v = 20.5kwh, at 2450w input, that's 8.6 hours running time. This seem right?
Our prop is 16” or 406mm diameter with a 14” pitch. We are hoping to get a new prop in the near future. Looking at 3 blade feathering. Since metal work and machine isn’t my forte we purchased a system that already had a thrust bearing on a stainless plate with timing belt pulleys and a spot to mount the motor. Starting from the prop is goes cutlass bearing, stuffing box, sprockets with double roller chain to connect the prop shaft to the thrust bearing shaft, thrust bearing, stainless plate, and then timing belt pulley. The run time calculations are correct. We normally motor around 3.5 knots as the prop doesn’t seem to vibrate as much.
@@SVBombadil So with that prop, you're even closer to matching my planned build! I ran through the spreadsheet on the Thunderstruck website you mentioned; I don't know how to calculate my prismatic coefficient, so I stuck with the 0.54, and that says I should expect 4.4 kts at 3.2kw. Again, thank you very very much for sharing this info! I've been doing all of my planning around "educated napkin math", your build is the first I've found so close to what I'm trying to do. Cheers!! :D
Can you share some data on the motor. How many KW, how much battery KWH, how fast you can go and what speed you have found best for range and what range. You know, all the data everyone wants to know. If you already published that, my apologies. Just point me to where you shared it. I suspect if you did a concise video, 5 to 15 minutes, and went over that you would add a lot of subscribers.
Thanks for the suggestion! Phillips doing some additional research and we will try to get some really accurate data. May take us a while, but we will work on getting a technical video made!
@@SVBombadil Great. I look forward to it. If I end up doing a conversion I will also make a video of the process. Let me know when the data is ready and I can reference your video it on my channel.
Motoring finding for our Ericson 39. We installed an AC34 motor from HPEVs, it is capable of producing 32hp/24kW peak, and 16hp or 12kW continuous. It is an air cooled motor. The battery bank is 19.2kW. The fastest we have motored is 5.5kts, pulling 6.3kW. The system could go faster but our 2 blade folding prop is slightly out of balance and vibration get bad above this speed. The best speed vs power consumption is right around 3.5kts, pulling 1.6kW. The following data is based on theoretical model data is a few points to validate the numbers. Range is to 80 battery capacity: 1 kt 0.04kW 472NM 2 kt 0.31kW 106NM 3 kt 1.05kW 44NM 4 kt 2.45kW 24NM 5 kt 4.79kW 9.9NM Hope this helps.
We have a Curtis ET-134. We purchased it from ThunderstruckEV. We added a 3D printed throttle lever to work for our mounting configuration. It is the same throttle assembly we had on the last boat and it worked well. Allows for forward and reverse without a separate switch. The rated voltage for the throttle is 13-58VDC, which is what gave us trouble but I was told that in the past they have been able to be run on normal 12VDC circuits.
success ... well done .... it goes forwards and backwards on command now .... thx for the share .. as always .. never stop dreaming, ust dream bigger .... have fun be safe, save our oceans ......
Thanks Peter! It was definitely a frustrating process but now it works like a charm!!
Yeah, save our oceans. It’s great they don’t have a polluting engine that uses petroleum products like a fiberglass hull, Dacron sails, polyester rope. And besides, a sailboat is absolutely a necessary form of travel.
Do you have a blog post with results of measurements, boat details and BOM for EV conversion project?
We don’t have a blog with all the info on it. High level over view, we have an Ericson 39, weights 22,000lbs, 30’ water line, drafts 6’, 19.2 kW of batteries, battery banks is 48v, the motor is AC-34 from HPEVS, both motor and t gear reduction plate were purchased through Thunderstruckev. Hope this helps if you have additional questions feel free to ask.
what brand or company did you go with for your electric drive motor
We bought our motor, motor controller and gear reduction kit through Thunderstruck! The Motor is an HPEVS AC-34.
Do you mind sharing the details on your throttle? Brand/model/supplier?
Howdy! I tried to write down the speed/input powers I heard you two mention in the video, which is super helpful. My boat that I am converting is fairly similar (C&C Landfall 38), my LWL is 9.2m, yours is 9.14m if Sailboatdata is accurate. My displacement is 7.6 tonne dry to your 8.6 tonne. I've got a 10kw motor on order, and I got the Kelly controller, but all in all pretty similar specs. I've been trying to figure out what RPM I want to optimise my prop for (430mm Ecoprop 3-blade) for max range, which is why I was so fascinated by the numbers. May I ask? You mentioned in the video that you have (had?) a two-blade feathering prop, so no regen, what diameter is it? That you were getting 4kts at 1.8kw is really really encouraging! Have you done follow-up / longer range tests to dial in your power/speed curve? Super interesting, thanks!!
We have a old gorri 2 blade folding prop. The prop doesn’t allow regen as it folds back while sailing. The day we did the testing there was a slight breeze and I think it skewed some of the numbers. We purchased our motor through Thunderstruckev and they have an excel spreadsheet ( www.thunderstruck-ev.com/10kw-brushless-sailboat-kit-sevcon.html in the manuals and downloads section) that is fairly accurate in estimating power usage while motoring. Used it for both this boat and our previous boat. Using real world data and spreadsheet this is my finding 1 kt - .04kW, 2kts - .31kW, 3kts - 1.05kW, 4kts - 2.45kW, 5kts - 4.79kW, 6kts - 8.38kW. My struggle is motor testing and data collection isn’t as fun as sailing so haven’t taken in lots of data.
If you have additional questions feel free to ask!
@@SVBombadil Thanks for that! What's the diameter of your prop? I'm really hoping the Autoprop Ecostar will be worth the cost... On paper though; It's designed for electric, and the blades flip 180 degrees to get optimal regen (and astern power). Next question; How is yout thrust bearings setup? I want to make sure the pulleys are forward of the thrust bearing to make it easy to swap belts. Thanks!!
@@SVBombadil Looking at your numbers, it looks like the sweet spot between speed and power is ~4kts. Is this where you tend to cruise at? If my math is right (400Ah at 51.2v = 20.5kwh, at 2450w input, that's 8.6 hours running time. This seem right?
Our prop is 16” or 406mm diameter with a 14” pitch. We are hoping to get a new prop in the near future. Looking at 3 blade feathering. Since metal work and machine isn’t my forte we purchased a system that already had a thrust bearing on a stainless plate with timing belt pulleys and a spot to mount the motor. Starting from the prop is goes cutlass bearing, stuffing box, sprockets with double roller chain to connect the prop shaft to the thrust bearing shaft, thrust bearing, stainless plate, and then timing belt pulley. The run time calculations are correct. We normally motor around 3.5 knots as the prop doesn’t seem to vibrate as much.
@@SVBombadil So with that prop, you're even closer to matching my planned build! I ran through the spreadsheet on the Thunderstruck website you mentioned; I don't know how to calculate my prismatic coefficient, so I stuck with the 0.54, and that says I should expect 4.4 kts at 3.2kw. Again, thank you very very much for sharing this info! I've been doing all of my planning around "educated napkin math", your build is the first I've found so close to what I'm trying to do. Cheers!! :D
hope in final got good motor and good generator motor of eletric..supply you good power..Ac and DC.with good watt and volt.good Hz in ac
Can you share some data on the motor. How many KW, how much battery KWH, how fast you can go and what speed you have found best for range and what range. You know, all the data everyone wants to know. If you already published that, my apologies. Just point me to where you shared it. I suspect if you did a concise video, 5 to 15 minutes, and went over that you would add a lot of subscribers.
Thanks for the suggestion! Phillips doing some additional research and we will try to get some really accurate data. May take us a while, but we will work on getting a technical video made!
@@SVBombadil Great. I look forward to it. If I end up doing a conversion I will also make a video of the process. Let me know when the data is ready and I can reference your video it on my channel.
Motoring finding for our Ericson 39. We installed an AC34 motor from HPEVs, it is capable of producing 32hp/24kW peak, and 16hp or 12kW continuous. It is an air cooled motor. The battery bank is 19.2kW. The fastest we have motored is 5.5kts, pulling 6.3kW. The system could go faster but our 2 blade folding prop is slightly out of balance and vibration get bad above this speed. The best speed vs power consumption is right around 3.5kts, pulling 1.6kW. The following data is based on theoretical model data is a few points to validate the numbers.
Range is to 80 battery capacity:
1 kt 0.04kW 472NM
2 kt 0.31kW 106NM
3 kt 1.05kW 44NM
4 kt 2.45kW 24NM
5 kt 4.79kW 9.9NM
Hope this helps.
Do you mind sharing the details on your throttle? Brand/model/supplier?
Do you mind sharing the details on your throttle? Brand/model/supplier?
We have a Curtis ET-134. We purchased it from ThunderstruckEV. We added a 3D printed throttle lever to work for our mounting configuration. It is the same throttle assembly we had on the last boat and it worked well. Allows for forward and reverse without a separate switch. The rated voltage for the throttle is 13-58VDC, which is what gave us trouble but I was told that in the past they have been able to be run on normal 12VDC circuits.