Tracy, What is your fuel burn, engine or prop rpm, IAS and estimated hp
output at your preferred economy cruise speed.  I believe that I read it
before that you run the engine at around 5000 rpm with a 20 to 1

air/fuel

ratio.  I'm trying to get some numbers to give to a prop manufacturer so
that they can come up with a prop design for the Glastar.  I know that

it is

an apples and oranges comparision but knowing what the engine is

producing

at a given rpm and a know prop size might be useful in extrapolating
performance numbers for another airplane.

Del Johnson

Prop makers really don't care about that stuff but I'll give a few data
points for reference.  Prop makers basically want to know:
1.  Max HP
2.  Target max RPM
3.  Airspeed at WOT, level flight
4.  Max allowable diameter.

My prefered econo cruise numbers vary with altitude but at 12,500 I set up
for 5300 rpm, 175 [MPH] TAS & 6.25 GPH.

Tracy

 
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