I remember Gramps said here once that reducing the gearing can solve power problems.
Well I had a Razor E300 that could hardly take me up a slope (im 12 stone) but changing the motor cog from 13teeth down to 11 has really improved it.
I get noticeabley more power, it hasnt really affected my top speed and I seem to get more range!?!
Looking at the equations it seems that DC motors are most efficient at about 80% of their top RPM?
I think they put out most most power at half their top RPM (torque x rpm is a max at this point) but the motors use less battery energy at higher rpm due to back emf so its actually more % efficient nearer the higher rpms
I think thats right? Can anyone tell me in real life approximately how many volts back emf you get on a 24v 250w motor running at full speed?