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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

    Hi John,
    You can go "On Condition" inspections past TBO here in the US. Other countries may have different rules and I don't know what they are.

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

    Thank you said by: John Fleming
      
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  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    Thanks Roger,

    I am very grateful for your input.

    So Max MP - Is Bill correct above? Should I not go above those marked in the manual?
      
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  • Re: Need advice - in flight adjustable prop

    by » 6 years ago

    Actually Roger, I have just been away educating myself on what MP actually is, as I was mistaken, and a pity that it's not really covered in our curriculum for a Rec pilot.

    Now that I understand what it is, and what it's actually happening inside the engine, I am now not in fear of going too high on MP, knowing that it actually can't. :)

    Thanks heaps Roger, and I will report back with some numbers soon.

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

    by » 6 years ago

    UPDATE.

    SO... Took the bird up today and did some playing with my adjustable prop. Had some great results. I got her settled in the cruise and coursed the prop up as far as possible while keeping the RPM at around 5300. I actually had to back off, as it was a little lumpy and she was pushing 115kt. I still had more prop and more throttle to go. not WOT, so she could really boogie!!

    Got it settled and was cruising along with a Ground Speed of 118kts. MP was about 25 from memory (will check the video) and that was about 3000ft up.

    Pretty pleased with the result. She really pumped along nicely. :)

    Will have a bit more of play next time I am up - hopefully some smoother air.

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

    by » 6 years ago

    @Roger Lee,

    Do you have any good resources on understanding how the MP work in these beasts. I am trying to get a really good understanding of how it wall works and the "what not to do's" if you know what I mean.

    I have in my mind basically not not let the RPM get too low while the prop is course. So anything below 5200 with the prop coursed up, is bad right? So am I right in thinking, if I keep the RPM above 5200 and below 5500, and keep adjust the prop until it's settled nicely - is about right? It's the MP that I need to really understand.

    Cheers
    John
      
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