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Wrong direction for the prop

in 912 / 914 Technical Questions 7 years ago
During shut down I had the prop turning half to one turn in the wrong direction. Some advice?

Tnx

  • Re: Wrong direction for the prop

    by » 7 years ago

    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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  • Re: Wrong direction for the prop

    by » 7 years ago

    I'll check but normaly About 2000 ..
      
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  • Re: Wrong direction for the prop

    by » 7 years ago

    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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  • Re: Wrong direction for the prop

    by » 7 years ago

    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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  • Re: Wrong direction for the prop

    by » 7 years ago

    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)
    520-349-7056 Cell

      
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