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Reply for Rachell et al : power source

 
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In the forum topic 'A fuel source you may not have considered', Rachell Koenig asked what if we could run a device from the heat we produce to power a fuel feeder?
My suggestion 'without much thought' is how about a Stirling engine, also known as a hot air engine.
 
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Low temperature/efficiency stirlings are quite simple to build,
however efficient stirlings are very demanding
as they need very high temperature differences.
 
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Captain Lu Yoder demonstrates a Stirling made from scrap parts.
http://www.youtube.com/watch?v=P6oEjnznwS0
 
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