CAL 2-27, 4'5" draft or thereabouts, 7600lbs. 48v bank of golf cart batteries, Kelly sine wave controller. I was running a ME01014201 5kw motor through a Baldor 2:1 reduction gear. I just swapped it out for a 3:1 gearbox, figuring that the 14" 3 blade prop called for a higher ratio.
Net result, meh. Slightly lower top speed, but slightly better performance than before, in the upper range. Slightly lower performance (rpm/watts) at the lower end. Same results with both the 5kw motor, and my ME0913 motor rated at 10 or 12kw, depending on who is doing the talking. I had thought that a 50% change in reduction ratio would have a more profound effect than that. The moral is of course don't lose any sleep agonizing and calculating over the appropriate reduction ratio to the second decimal for the type of e-drive installation common to this group.
So having seen basically no difference between 2:1 and 3:1 except that at low speed (where I mostly operate) the 2:1 works a little better. I am now seriously considering trying direct drive through a thrust bearing in the near future. I can always change it back.
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