Jim and Heather,
I am surprised by your reading of those Rotax curves as my own reading is very
different. This is what I read:
You can develop 75% power (51KW) with WOT up to 2300 ft. at 5000 RPM. You can
develop 65% power (45 KW) with WOT up to 5700 ft at 5000 RPM.
According to those curves, to get 75% power at higher altitudes, you need to run
the engine at a higher RPM: for example, WOT at 5500 RPM gives 75% at 8000 ft,
WOT at 5500 RPM gives 65% at 11700 ft.
Regards
Remi
<<<<<<A normally aspirated engine (912S) loses power at higher altitude because
the air
becomes less dense so manifold pressure decreases. There is a graph in the
912S OM that shows this. You can develop 75% power (51KW) with WOT up to 2300
m (7000 ft) at 5000 RPM. You can develop 65% power (45 KW) with WOT up to 3500
m (10500) at 5000 RPM>>>>>>>>
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