Yeah I use a Baldor gearbox, 2:1 ratio, in a Cal 2-27, 14x10 prop, 5kw ME0201014201 motor, 48v bank of GC2 golf cart batteries. I like not having exposed belts or chains. Motor bolts right up to the reduction gearbox, which bolts right up to a standard C face motor mount. Very convenient. Fully enclosed, never needs servicing. The only thing I don't like is you can only have a whole number gear ratio. 2:1, 3:1, etc and if you use pulleys and belts, you can easily change ratio to fine tune your power curve, and you can only switch gearboxes to change the ratio with the Baldor setup. Price is right. All in all, I like it. If I used belts, I would also have to install a thrust bearing on the prop shaft.
I also have a 12kw ME0913 motor that I have stuck on there but I have not tested it exensively with the current prop. At 48v it seems to do okay with the 2:1 gearbox but the jury is still out. I would probably go with the 3:1 ratio and a higher voltage if I had designed the system for the ME0913, I think. Prop is pretty close to the biggest I can swing and still have decent hull clearance.
Oh, one thing... if you are using a Motenergy motor or similar, and have a 1" shaft, the motor and the gearbox has a 7/8" shaft and so you need to make up the difference for the shaft coupling. I used a brass bushing with a slot cut in it, from McMaster Carr. Then used a normal 1" by 1" coupling to a stub shaft and another to the prop shaft, with no U joint or flex coupling. But do it like you feel it.
I think you will like enclosed gearing. Try to get the ratio right the first time so you don't have to buy another gearbox.
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