REFLECTOR: MUSCLE PLANES
Al Gietzen
ALVentures at cox.net
Thu Sep 28 22:59:12 CDT 2006
Al,
Do you have enough time on the engine to see what the fuel burn is? I have
heard that one downside to a
rotary is the fuel burn goes up. Have you found that to be true?
Jack
Jack;
It's on the list for the next flight to get at an approximate fuel burn.
Engine monitor is not yet calibrated to give a good number. I do have data
that we got on the dyno.
Power Cruise 5000 rpm (2300 prop) - 200 hp 18 gph BSFC = 0.54
lb/hp-hr
Lean Cruise 4500 rpm (2075 prop) - 155 hp 13 gph BSFC = 0.49
5000 rpm WOT - 222 hp 19.2 gph BSFC = 0.52
Much the same consumption rate as a good aircraft engine; not as good as a
typical automotive piston engine. This, of course, is with 87 octane mogas;
so compared to avgas - or even 92 octane - $/hr is at the low end. Based on
actual flight data, 4500 rpm gives a TAS of about 180 mph on my SE RG; and
14 mpg isn't bad at that speed.
Al.
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