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Rotax 912 S performances

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Remi Guerner

Joined: 14 Dec 2010
Posts: 284

Posted: Mon Sep 22, 2014 11:12 am Post subject: Rotax 912 S performances

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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