More detailed link:
http://machinist.salon.com/blog/2007/08/21/robotic_arm/index.html "At a certain point, the weight of the batteries required to provide the energy to operate the arm for a reasonable period becomes a problem, and it was this poor
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IIRC, the Kriegsmarine was experimenting with peroxide-powered U-boats, but it didn't really work out. I suppose that the distinct possibility that leaks and such would result in the crew becoming bottle blonds could only have appealed to them.
--josh
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Peroxide-powered submarines sound like a good idea, since the reaction produces steam for power plus oxygen for breathing. I wonder if the Germans found it too expensive, or too unsafe? I think peroxide is/was used for torpedo propulsion too.
I guess you could make a bipropellant engine (or even an air-breathing methanol fuel cell) safer than a peroxide engine, but you might not get the necessary power density.
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