Hello group, I'm putting together an electric system for an Islander 32' using the MARS brushless set-up. I'm puzzling out the power transmission and motor mounts. First question is about the motor mounting. Looks like most people are using 1/2" AL to mount the motor and shaft bearings. Could heavily glassed ply be used in its place or does the AL acting as a heat sink make it a better choice?
Second question is about power transmission. Seems there are three choices: use an existing marine transmission, use an industrial gear box, or set up something with belts and pulleys.
I have the gear box from the diesel we pulled, I just worry about it being inefficient and not allowing the prop to spin the motor for regen. Anyone know how efficient small marine transmissions are whether it would be a good way to go? It would certainly be the easiest solution and the MARS motor runs at about the same RPM as the Yanmar did so the ratios should match up well.
Second option is an industrial gear box like Propulsion Marine offers, this also looks like a good solution with a minimum of engineering involved.
Third option, which I'm leaning toward is setting up a board with the motor and some pulleys to bring the speed down for the shaft. V-belt, chain, or timing belt? One thing I haven't seen anyone address is idlers or tensioners on the belts, there has to be some method of tensioning the belts. Are people just using a slot and leverage before bolting down like an alternator? I've seen spring loaded tensioners for timing belts that looked like a good solution.
The other question I have is about thrust, a pulley and belt set up needs some sort of thrust bearing, do the flange bearings I see being used provide that function or is an additional bearing needed in the system? I'm new to the mechanics of power transmission, so I've got these questions.
Thanks, I'm looking forward to some discussion on the mechanics of setting up such a system. I've got a good grasp on the electrics, charging, and battery systems, its just the mechanical part I still need some help with.
Thanks,
David
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