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Chocke 912 UL

in 912 / 914 Technical Questions 13 years ago

  • Re: Chocke 912 UL

    by » 13 years ago

    Then 912 UL's would be better served in the long run with an idle above 1400. An idle around 1600-1700 would be much better for other engine and gearbox components over the long run due to vibration. the 912ULS is far better off around 1750-1800 for idle. I know these will run at lower rpms, but in the long run you will be doing repairs earlier than necessary. With idles set too high or too low hard starting results. Having the correct spark plug gap and fresher plugs (not 200 hrs old, change them at 100)is also important.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Chocke 912 UL

    by » 13 years ago

    I Never Run the Engine at such low rpm however, I adjusted the idle rpm to 1400 rpm to improove the Choke Funktion. The position of the throttle valve depends on the adjustment of the idle screws and you can not close the valve more then that.
    If you close the throttle all the way does your engine stop if you pull the throttle fully back?
    Regards
    Lukas
      
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  • Re: Chocke 912 UL

    by » 13 years ago

    If my engine were to idle much above 1400 the plane would never land! I find that if the carbs are well balanced it idles quite smoothly at 1400 rpm.
      
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  • Re: Chocke 912 UL

    by » 13 years ago

    Hi Kevin,

    The stick controls the speed so even at 1600 rpm you can pull the stick back to slow down. My plane has a 14:1 glide ration and i have heard people say they can't land (912ULS) with more than 1700 rpm. I take them up and use 2800 rpm and pull the stick back more and slow down and land. Yes the nose is up a little more and yes you may even float 75-100 ft. farther, but the plane will slow to a stall speed and land. Depending on your skill level you can set it down right on target and still land in almost the same distance as the lower rpm. That just becomes a target skill issue. You might try and set it up to 1550 and see if that helps at all. It also helps with the landing with many planes adding and keeping a little power until you touch.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Chocke 912 UL

    by » 13 years ago

    Are you sure you have no throttle on? I understand any throttle will cause hard starting.
      
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