charles harbert wrote:

mike wrote:

Can anyone tell me if 200-220 H.P. is possible and reasonably reliable from a

rotary

with Tracys E.F.I,. and if so how. Porting  rpm etc. etc.

Mike, I think it is unrealistic to plan on this kind of hp for a non turbo 13B
in an airplane. Paul's numbers are correct for highly modified (race prepared)
engines, but this is not as good plan for a reliable, fuel efficient a/c
application IMHO. The other factors you need to consider are torque and hp at
lower rpms, fuel burn (BSFC) at high rpms, heat rejection, and cost.

I disagree on the fuel burn. Peripheral ports running at 5000 RPM cruise
are just as efficient as side ports if not more so. Torque at low RPMs
is not a factor in an aircraft engine. The prop HP required is at least
a square law function with RPM. The most succesfully rotary engine
airplane so far was the Power Sport engine in Allan Tolle's RV with 
peripheral ports.

Paul Lamar

 
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