912ul runs on

[Monocock]

I too had terrible run-on probs with a heavier (6 kg/13 lb) prop. I switched to a Kiev (for lots of reasons, not just hard shut-downs) and after circa 200 shut downs I have never had a run-on problem since. When I was investigating the original problem my engineer swore that the prop weight had a direct effect on the shut down. I now have 2.5 kgs (5.5 lbs) less weight spinning on the hub.

Out of interest egp8111, what is your idle set at?

[catz631]

I have my idle set at around 1500-1600. This lower rpm will give me a lower rpm on approach(around 1900-2000 or so with the airload) On the ground I adjust it to 1800 for taxi and ground ops.
Dick

John,
I too was totally buffaloed by the prop/gearbox effect on run on but in my case it solved the problem and as mentioned I only stumbled on a possible solution by reading an article on the effects of prop weight on the Rotax engine. I wish I could remember where. I am always "in the books" over this engine as it was a completely different thing compared to the Lyc/Cont engines I was used to.
It is only in the last year or so that I have fairly well trusted this engine. I had many problems in the beginning and without you guys and other sources,I was on my own. I have attended 4 courses on the 912/2 stroke so far and have another renewal due this year. I still have much to learn !
I highly recommend that any and all of you guys attend an engine course if you can.Believe me they are very good and a wealth of information. As the man says," it's like drinking from a fire hose !" Take lots of notes !