My original setup was BLDC bolted to a cast iron enclosed reduction gearbox, mounted on a thrust plate bolted to angle irons attached to the motor bed stringers, shaft coupled to the gearbox output. It was 2:1 and I thought maybe I was overpropped with the 14x10 3 blade. So, I tried a 3:1 gearbox and instead of increasing efficiency, it actually ran at slightly reduced efficiency. The obvious thing to try, after a higher ratio didn't work, is a lower ratio. Namely, 1:1. So I built a thrust bearing mount for the motor, and I will bolt it to the thrust plate the same way that the reduction gear was bolted to it, and prop shaft coupled same way. See pics below.
No idea whether this will cause cooling issues so I will be watching it closely with the IR thermometer. The motor has an internal thermistor so I will also maybe connect that to the Kelly controller and set a reasonable overtemp alarm point and overtemp shutdown. I suspect the optimum ratio is just a bit above or a bit below 2:1 but maybe getting all the gears out of the drive train will offer a little more efficiency. Just speculating. Anyway I hope to get this thing installed today.
Assembly Mk I turned out to be too wide to fit between the stringers, so I cut the front and back face plates down to where they no longer extend beyond the side plates. Hopefully all is good, now. Motor is the ME0913. Thrust bearing came from Glen-L. Stub shaft in the assembly was just to locate the bearing accurately relative to the motor axis.
Fingers crossed. Now its time for my morning cappuccino and gitter done.
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