Among motor types, which give the best power ( energy per unit of  
time )  to weight ratio ?
I am not going to consider reliability as a factor.
I am not including auxiliary items such as fuel tanks, air lines,  
cabling, etc.

Air motor
Electric Motor
       Brushless
       Stepper
       Brush
       AC Synchronous
       Induction
Hydraulic Motor
Rubber Band Motor :)
Mystery Motor

FOR ELECTRIC MOTORS
Short of using superconductors, what improves the P/W ratio for an  
electric motor ?
I suppose running hotter with more current might improve the P/W.
Is the power a function primarily of the amount of current moving  
through the motor ?

Best
Gus


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