The noise is probably just the normal noise from that motor and controller combination, since the lower unit makes no noise when you spin it with a drill. Square wave controllers tend to make a motor run a bit more noisy than a sine wave controller. It is what it is. But if you line the original outboard cover with rock wool or something you might deaden the sound just a bit. And I bet it is still quieter than the original infernal combustion engine. I have no first hand experience with the Golden motors and controllers but my Motenergy motors with the Kelly controllers make a bit of noise. Sort of like George Jetson's car. But nothing like the old Atomic 4 it replaced!
When you say the motor spins silently, do you mean while powered by the controller, or spun by hand? When you turn the shaft by hand, it should be silent. Under power, it won't be, and under load, it will likely make even more noise, yeah. Also, when you spin the motor by hand, do you feel a definite cogging effect? This is related to some of the noise.
As for the reduction gear, typically when used in an old outboard conversion you need no additional reduction gear at all. You might want to experiment with different props, though. Your motor is probably rated for much lower max RPM than the original ICE was rated at. But a 50HP motor can turn a much bigger prop than a 6.5 hp motor can, so I suspect that you might be overpropped a bit. Just guessing. DISCLAIMER: I have not personally built an electric outboard so I might be missing something here that someone with experience converting outboards can fill in.
My reduction gear is made by Baldor and is fully enclosed, "C" face on both ends so it mounts to a standard faceplate and the motor mounts directly to the reduction gearbox. I am using 2:1 with my current motor/prop combination and of course mine is an inboard installation. My original 5kw motor is a slow wound motor and would probably work with zero reduction, but I needed a thrust bearing anyway so I used the gearbox. Anyhow it was fairly inexpensive and should last practically forever.
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