>JD> Modern energy storage flywheels seem to be going towards  
 >JD> light, high-speed outfits. 
 > With *mobile* uses, a low speed hi mass flywheel would adversely 
 > affect accelleration. 
That, and you can store much more energy in a high-speed wheel, even if it's 
lightweight, than in a low-speed, heavy flywheel. I've seen the formulas, and 
it's fairly dramatic.
Sort of like the small hydropower outfits you see today. Just a few GPM at 
high head pressures will generate usable power, whereas low heads require 
many cubic feet per second of flow to do the same job. Not to mention the 
large machinery, dams, etc.
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