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Wrong direction for the prop

  • Willy's
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4 months 2 days ago #16585 by Willy's
Willy's created the topic: Wrong direction for the prop
During shut down I had the prop turning half to one turn in the wrong direction. Some advice?

Tnx

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4 months 2 days ago #16586 by Rob Seaton
Rob Seaton replied the topic: Wrong direction for the prop
what is your shut-down RPM? maybe it is too high and you have a lot of unburnt fuel causing a dieseling effect?

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4 months 13 hours ago #16603 by Willy's
Willy's replied the topic: Wrong direction for the prop
I'll check but normaly About 2000 ..

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4 months 13 hours ago #16605 by Peter Kl.
Peter Kl. replied the topic: Wrong direction for the prop
I would be surprised if half a turn did any harm. The engine clearly is not designed to be operated in the opposite direction, that's for sure. Also it is not recommended to manually turn it the opposite direction. One reason for that may be that the oil supply cycle is one way only. And we don't want air bubbles in the oil cycle. But half a turn or even one turn in the wrong direction when stopping the engine completely should do no harm. I am close to guessing here and will follow this thread to see what the experts know from field experience.
Regards
Peter

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4 months 7 hours ago #16607 by David HEAL
David HEAL replied the topic: Wrong direction for the prop
Your shut-down RPM seems a bit high. As I recall, ROTAX suggests idling @ 1,800 RPM to stabilize cooling and then shut down one mag and then the next. I can't recall ever having my 912 ULS kick-back during shut-down.

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4 months 3 hours ago #16608 by Roger Lee
Roger Lee replied the topic: Wrong direction for the prop
2000 is a tad high for shut down. Try 1650-1700 next time and see if that helps. Also if you can turn one mag off for a few seconds then the second one.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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