To summarize the current thought :
-- SP thinks hydraulics would provide best P/W ratio

-- Electric Motor afficiandos  
      SP says power would be a function of Ampere turns.   This is  
what I thought as well.   SP also says Neodymium permanent magnets are  
used in high performance motors for model aircraft.  This is my belief  
as well.

Gus ==>  So at the extreme, one might dump massive amounts of coolant  
on the motor, crank up the voltage to force more current flow and get  
the lowest resistance wire.  Silver is only slightly better than  
copper and ( I was surprised ) gold is worse than silver or copper.


Best
Gus
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