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Rotax 912 S performances

 
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Remi Guerner



Joined: 14 Dec 2010
Posts: 284

PostPosted: Mon Sep 22, 2014 11:12 am    Post subject: Rotax 912 S performances Reply with quote

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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