Well, thats the point I dont like, you don’t lose power by not using the full power band! You lose a little bit of efficiency (which also is variable with load). But since driving at lower speeds than topspeed (not maximum dutycycle) is basically the same (your ESC will step down voltage to deliver motor a lower voltage than battery voltage), I don’t see that as an argument.
Not using the full power band has the only disadvantage of carrying more weight and a bigger motor (than theoretically necessary).
To continue, Spoiler Alert: having a gear adds weight and makes your propulsion unit bigger.
Let me guess, mathematic or physic background?
Coming from a engineering background this makes absolutely no sense: efficiency decreases with:
rising (input) rpm (regardless of reduction, just by additional bearing losses/heating and viscose friction of the lubricant (no, you cant use magnetic bearing, magnetic reducer and vacuum for a gearbox in the real world))
rising reduction ratio (by having e.g. more stages or different tolerances due to sizes).
So your 1 million rpm motor might melt bearings, but wont have any practical use.
Also inappropriate example in our case, since the human body only can do very limited cadence (RPM) and variable gearing is not an issue in water since acceleration of the propeller is not the issue. High torque demand comes at with high rpm in water. For acceleration of a bicycle you need high torque all the way to topspeed.
Still the powerlifter will win in a (endless) long race… on the flat, without wind
I am excited to see you cooling concept (of motor and gearing of course).