ORIGINAL: rmh

a simple example which demonstrates the BIG difference in electric vs IC engines:
Electric has MAXIMUM torque at zero rpm - from then on, torque remains same or decreases
IC engines have max torque ONLY when engine rpm reaches the point whre the flow of fuel charge is optomized resulting in maximum pressures in the power stroke.
From then on, torque decreases -at some rate- depending on engine design
So?
well , max torque occurrs at only one point somewhere in the rpm curve on an IC (design parameters determine this point)
BUT
You start with it on the electric and can potentially reach it again at any usable rpm - depending on power supply/ speed control/design limitations, ability to provide current needed .
The corker is that you also can apply a braking force to the propeller AS DESIRED-if you have proper motor control
This is accomplished by using back electromotive force (Back EMF) which is accomplished simply by shorting out the power leads (oversimplification here) and the motor -which is trying to generate power - , generates into a ''short'' which becomes a brake .
Couldn't be sweeter.
(This technology is about 100 years old by the way - but batteries have-up till now been incapable of producing sustained power in a light package.)
Don't believe it?
Look at the first electric cars in the early part of the 1900's