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Need advice - in flight adjustable prop

in 912 / 914 Technical Questions 6 years ago

  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    Thanks Bill,

    I have that info - But I am looking for max! I am sure I can get those MPs above that if I over pitch etc - Hence I am looking for how high is too high - if that makes sense.
      
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  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    Also Roger - If I can ask....

    I believe my engine has a TBO of 1500 hours correct?

    But I am told that its that or 15 years - Can you please advise? My bird is 11 years old, so only 4 years away from the deadline, and I just would like to know my options.

    Cheers
    John
      
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  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    I would take those numbers to be Max!

    Ex. At 4300rpm do you really want more than 24"?
    That would be over-stressing the engine.

    At 5000rpm any MP over 26" is too high! That is only 1.5" from WOT Max!
    This implies that at 5000 Feet where the ambient pressure is about 25", you can go Wide Open Throttle and increase the Prop Pitch until the engine slows down to not less than 5000 rpm and still be good.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    If you Aircraft is registered Light Sport, The Manufacturer makes the TBO rules.
    If it is Experimental, you can fly it until it falls off!

    For Non-Certified Engines, Rotax TBO times are Recommendations.
    At least that is how I understand it.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    Thanks Bill,

    Yep. My bird is manufactured by Evektor Registered RAA (Recreational Aviation Australia) - but I would have thought the TBO for the engine would be set by ROTAX??
      
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