Dear Europa Community:
I thought you might find the following comments and attached spreadsheet of
interest.
I tested and tabulated fly data for Canadian C-GPEL on SEPT 17-2014. You mi
ght be interested to see where the most gain is for C-GPEL Classic 912S, Wo
odcomp 3000 two blade propellor, Smart Avionic Prop Control. The data colle
cted, for 4950RPM where possible, is denoted separately for fuel efficiency
and speed with a linear increase in MAP from minimum required power to kee
p the plane at altitude, all the way to WOT, measured at 2500 feet. There a
re some interesting jumps in the graphic curves, most noticeable around the
(EGT) point, where all 4 cylinders turned out to be exactly the same EGT w
ithin 10 degrees Celsius on a GRT graphic analyzer (meaning: most effectiv
e combustion=best torque). So for most efficiently butting into headwind
best suggested would be 27.5MAP (115 IAS) while most efficient tailwind us
e would suggest 24.5MAP (95 IAS) or even 23.5 MAP (91 IAS) with a fuel burn
of only 9.4 litres/hour (or 2.5 GAL/hr) exactly as the book says. Enduranc
e can be chosen at 22.5MAP with a fuel flow of only 8.1 litres/hr (2.16 GAL
/hr), magically arriving at 87 IAS, empirically found to be the most effici
ent climb speed. Quite a magic square this little airplane. This is all wit
hout any speed kit or wheel pants.
Chris
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