Guest Easeback1 Posted May 26, 2011 Posted May 26, 2011 Rotax 912F / Diamond Katana DA20 A1 Engine performing 100% normally during run-up. During flight, engine tone periodically increases in pitch for a few seconds before returning to normal. No change in manifold pressure or RPM during this time. This rarely occurs in straight and level flight, but usually immediately after adding power, initiating a turn or lowering the nose i.e. an increased load on the airframe. Something to do with the engine mounting? My experience is limited, so grateful for any advice.
Ultralights Posted May 26, 2011 Posted May 26, 2011 Try looking at the exhaust sytem, there might be a spring or three missing, or a crack opening up and closing again.
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