🔩 1:7 belt drive for mountainboard with badass torque

[ducktaperules]

@Marsl187 this looks great. im just curious, why mount the motor so far out? if you have a 2 stage reduction you get a lot more flexibility for the motor to wheel distance, so why have the motor so far from the axle?

@Chricious

I’m testing . . . at 12kW.

Not this again, do you really need someone to explain how power works one more time?

@WavRX

Gearing down is more efficient in terms of power consumption, in exchange of lower top speed.

Higher KV motors are more efficient so a larger reduction allows the motor to be higer KV whilst giving the same speed at the wheel.

@sesat

is the 200kv motor mated to a 1:3.5 gearbox less efficient than a 100kv motor mated to a 1:7 gearbox?

Think your mixed up here, 200kv motor is twice as fast as 100kv, and 1:3.5 give less reduction than 1:7 so output is faster. 200kv motor with 1:3.5 gearbox is 4 times as fast as a 100kv motor with 1:7 gearbox so not a far comparison to discus efficiency.

@Venom121212

Low kv motors have less windings but thicker windings. High kv has more windings of thinner copper.

also seems to be mixed up.

A low Kv motor has more winds of thinner wire. A high Kv motor has fewer winds of thicker wire. the thicker wire means lower resistance and therefore less heat generated and less copper losses.