Paul,

I've been thinking about the turbo compound idea a bit since we talked about
it last Sunday.  I'm thinking that the exhaust turbines used for a
turbocharger aren't really that well suited for putting horsepower into the
crankshaft.  They are designed to spool up quickly and optimized for driving
a centrifugal compressor.

I was looking at the turbocharger used on the P-38 and the B-17 and it's
fairly large in diameter with the exhaust exit well away from the shaft so
the force on the blades work a longer moment arm.  I think it also turns
much slower.  I'm thinking a configuration like this would be much more
efficient for our purposes and would allow normal gears to feed the power to
the crank.

Steve Brazil

Perhaps something like this? Cheaper and more durable than building a two liter
four cylinder turbo charged 500 HP piston engine. It should burn at least 5% less
fuel per HP generated than the very best piston engines, given there is at least
as much wasted energy in the exhaust as comes out of the engine shaft.

Paul Lamar


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