I usually am sceptical about using mathematics to rate the output of any motor or engine. The reality is how many RPM can we get out of a prop. That is what power is all about. This is the most accurate manner in which we see manufacturers like Jett have used. BLE is most correct.

However the manufacturers rating in electric motors are rather more 'accurate' and the output is more 'realistic' than what we get in glow motors.