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re: concentrator questions & clarifications
22 apr 1997
i wrote:

>(and once you have more than 6:1 concentration, who needs pvs? why not just
>make steam with a black target?) 

aerospace engineer rudy behrens (aurora farms, 1547 n trooper road,
norristown, pa 19403/(610) 489-6356) says making a small steam engine
is a piece of cake, very old technology involving about a half-hour of
calculations on the back of an envelope. start with a briggs and stratton 
5 hp gasoline engine, add oil to 150 psi steam, modify the timing to get
30-40% efficiency, watch out for explosions, $250 or so... who needs pvs?

nick

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