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Thank you! That was what I needed to learn more. Any recommendation for a reference work that can fill these occasional gaps in my understanding of mechanical connections?

Its a spline. Very common on transmission shafts. Allows for a slip fit and very high torque capacity.

Hello, I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I’ve not seen this before nor can I figure out what it is called.

Interestingly many motors used in boats are PMAC - permanent magnet AC 3-phase motors. These are controlled by a controller (such as Sevcon Gen4) that converts 12VDC to the AC to operate the

It will decrease range and top speed. I don't know how much yet. This is not a setup for offshore work. But if you need to get out and back from the marina on weekend day sailing trips it might do

I think you are correct at 50A for each TSM2500 but only at 220VAC input. If you are talking about two TSM2500's running of 120V you will max out at 3000 watts (1500 watts each). But only if you can

Do you have four different circuits on the boat to run them, and a 5kw inverter? 50a into the 10kw motoenergy motor is considerably on the low end of the power range for a 6 ton 30’ boat. My worry

Another what-if... Rather than trying to go 3000W @48V from 120V -?Amazon has a 1200W 12V power supply that runs on 120AC.Assuming(!!) the ground is not tied to the AC ground - can I tie 4 of these

Any idea how the 4 knots will work in wind/wave sea conditions ?That may limit the range.

Yep John it would be really hard to find a DC power supply at a reasonable price that would supply enough amps continuous compared to a battery. It’s also hard to get a setup from generator to

Yes, I think what you describe can work but from what I have found (and been advised by Thunderstruck) you need/want the battery in the system rather than powering the motor controller (of whatever

Yes, power is power.The thought was that it's relatively cheap to buy a portable generator and carry a can of gas as backup. Looking at this a different way... If I go with traditional 48V motors

Setting aside efficiency differences it still takes the same amount of power to move the boat at a given speed. AC, DC, gasoline, diesel. Doesn't matter. The boat wants what the boat wants.

This is probably a really silly question, but.... Is it possible to find a 120V AC motor that can be speed controlled (and maybe even reversed??) for at least a proof of concept on a boat? For those

I will look into this. They were 50 Hp Diesels, No Idea of brand or max RPM. Thank you for your reply.

Do you have power/speedRPM info from your diesel? This will help you predict correct reduction and propeller diameter. Your 72v motor will gave a top speed of 3,600RPM ?if, for instance, you had a

Retreat Time is a 2006 refit from diesel to electric however it is under powered having 2.2 kw PM brushless motors at 144v. Direct drive. They were re insulated, and upgraded to American motion

My 12m cat, Sunshine, has straight shafts (replaced ZF sail drive) powered by 10kW PMAC Motenergy 48v motors. Plenty of maneuvering power both forward & reverse.

John, you're right.For your big powerboat, reconditioning of the engines are the only way. When you have pulled the heads (at least one), you check the piston play and the condition of the piston

Thanks for the info. For the record, I suck at math and was just happy to find a plug and play solution to help me extend my range with an easy trickle charge whilst I am out in my cocktail cruiser.