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Questions tagged [rotax]

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2 votes
2 answers

Rotax 912 ULS operates well on ground but poorly in air

I have a Rotax 912 ULS in a pusher configuration. On the ground, run-up is good, the carburetors are balanced, both sides EGT are almost exactly the same, and there is no fouling on any plug. However, ...
1 vote
2 answers

Why could a Rotax 914 light aircraft lose power at 7000 feet?

I was flying an RV 4 equipped with Rotax 914 engine and variable pitch propeller. The problem was observed during flight above 7000 feet; vertical speed became 0, RPM overshoot for 2, 3 seconds to ...
22 votes
3 answers

Carbureted Rotax engines have no mixture control, how do they handle less dense air?

Rotax engines have no mixture control, yet they don't seem to have any more problems than other engines at altitude. How do they handle the lower air density in order to not get a too rich a mixture?