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912 UL cant rich MAX RPM over 5050

in 912 / 914 Technical Questions 11 years ago
Hi All
i am new to this forum
i recently buy plan with 912 UL and i am getting trouble to run with the full RPM
engine has 900 h since new
gearbox is 2.27:1
i am using GT prop D 166 pitch 145
the full RPM that i am getting is 5050
engine run smooth in all RPM setting but not getting more then 5050
i check all the intek and it is look fine
any help will be appreciate
Thanks

  • Re: 912 UL cant rich MAX RPM over 5050

    by » 11 years ago

    Hi Lir,


    We need just a tad more info.
    Was it running over 5050 before and this is new? Is this 5050 static rpm on the ground? That would be normal or is it at wide open throttle in flat and level flight?
    At least for the moment it sounds like it is way over pitched in the prop IF it is at WOT in flat and level flight. Is this a fixed pitch or ground adjustable prop? If it is ground adjustable then maybe all you need to do is reduce the pitch.

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

      
    Report

  • Re: 912 UL cant rich MAX RPM over 5050

    by » 11 years ago

    Hi Roger,


    the airplane is new for me
    according to the previous owner 5050 is what should be the MAX RPM
    but i suspect it is to low
    i am getting static full RPM of 5050 and i can see it get few more rounds in straight level flight
    but it is far from the 5500
    is there any documentation for max RPM and manifold base on engine prop combination ?

    i am using GT prop fix pitch (not adjustable) Diameter =166 pitch = 145
    engine has 900 h since new
    gearbox is 2.27:1
    thanks
      
    Report

  • Re: 912 UL cant rich MAX RPM over 5050

    by » 11 years ago

    Lir,

    Something isn't quite right. Your static WOT rpm on the ground will be lower than it is in straight and level flight at WOT. They both can't be 5050 with a fixed pitch prop.

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

    Thank you said by: andre robert
      
    Report
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