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912 iS Sport - cyclically vary RPM

in 912iS Technical Questions 8 years ago

  • Re: 912 iS Sport - cyclically vary RPM

    by » 8 years ago

    Thank you very much for your advice. Now it is clear where to begin.
      
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  • Re: 912 iS Sport - cyclically vary RPM

    by » 6 years ago

    Yesterday, when the Touch & Go manoeuvre was running, the engine rpm was in the range of 5800-5500, and changed cyclically for a few seconds.
    Airplane TL-3000 Sirius, engine 912 c / n 7703277, variable pitch propeller hydraulic manual, running time 162 hours on Garmin. Operating time according to ECU - 267 hours. // I do not know why such a difference, I bought a new plane with a new engine //
    I want to ask for advice, than it can be caused by such work of the engine.
    Now I have the downloaded engine logs. Line A, Log 833, time 267:14:55

    https://drive.google.com/file/d/1hH4Cgj2kWCm7sjwDPw5ozlmgYv2q_4Mt/view?usp=sharing

    thanks to everyone
      
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  • Re: 912 iS Sport - cyclically vary RPM

    by » 6 years ago

    Hi Uladzimir,

    Was this a one time occurrence with the engine stumble or did it happen more than once? How drastic was the rpm up and down cycle?

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

      
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  • Re: 912 iS Sport - cyclically vary RPM

    by » 6 years ago

    Hi Roger,
    Recently it was once. But this situation was more than a year ago.
    After your advice, I adjusted the torque on the overload clutch and increased the minimum pitch of the propeller.
    Frequency of rpm up 5800 and down 5200 cycle - two times per second. Subjectively it seemed that in this mode the engine power is very small.
    Maybe this is somehow related to the low air temperature (minus 12°C)
    On the diagram it will be more clear what happened



    BR
    Diagram.png (You do not have access to download this file.)
      
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  • Re: 912 iS Sport - cyclically vary RPM

    by » 6 years ago

    the quality of the image is lost when uploading.
    here is the link
    https://drive.google.com/file/d/1A8_63FDK81VQF3CFgae7uczWwBoNqki2/view?usp=sharing

    engine speed fragment
    Diagram_fragment.png (You do not have access to download this file.)
      
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