Rob W M Shipley wrote:

Has anyone on the list considered this as a means of normalising

performance

at altitiude.

Rob
Rob W M Shipley
rob@robsglass.com

We don't need no stinking normalizing. :-) The rotary is very
robust and tolerates lots of boost at sea level and as high
as you care to fly.

Paul Lamar

Rob W M Shipley wrote:

Well how about as a source of boost then?
Rob

Superchargers increase the over all HP load on the engine
because the HP required to drive them comes from the output
shaft.

Consequently supercharged engines burn more gas than
turbo charged engines for a give HP output.
Turbochargers make use of the otherwise 50% waste energy 
in the exhaust. 

BTW They both require intercoolers as the heat increase
in the charge air is strictly a function of the
amount of boost regardless of the supercharger manufacturers
claim otherwise. Boyle's and Charles' laws of gases.  


T2 = T1 X (p2/p1)^.283

T in Rankins = F + 460
p in absolute pressure.
p1 = 15 psi at sea level.
Five pounds boost = 20 psi.

100% efficient compressor. 

Paul Lamar
 
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