Martin Orro wrote:

Thought this might interest those touting the 'economy' of "real" a/c
engines.  Taken from the canard list.

snip

My engine was dyno tested after assembly and
showed 176 H.P.* I think that I can obtain
95% of that upon installation. Is that a good
estimate between dyno and actual installation?

snip

* RPM   Power  Torque  BSFC
  2200   89    203     .494  (Best for cruise?)
  2600  146    282     .566
  2700  165    309     .617
  2775  176    317     .698

A dyno does not always give the results you need.
What you must do is lean the mixture for light loads
and dyno operators rarely do that. The mixture
at 2200 RPM may be full rich for max power at 
wide open throttle. Not something you would see 
with a fixed pitch prop.

This is obviously full power rich mixture BSFC's. Best economy at
part power leaning the mixture would give better BSFC's. 

A rotary functions the same way.

Interesting data anyway.
Thanks.

Paul Lamar
 
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