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Hi,

I would like to get some sort of clarification before I change my prop pitch (Klassic Composite 3 blade ground adjustable) fitted on a BRM Okavango.

my question is.. recently was flying and decided to have a look at the MAP while flying @ 4800-900 MAP was around 27.2 +/-.

I normally fly @ 4200 MAP is set around 26 +/- and take off rpm (WOT) 5200 on roll and will be around 5000 - 5100 on climb not more than 1 min then I cruise climb @ 4500.

I don't really need a fine pitched prob as I don't have obstacles to clear B) with the current setup 2 pob I will see around 800 to 1000 f/per minute


Do you suggest I will keep this setup..
  • Re: Rotax 912ULS MAP

    by » 9 years ago


    MAP isn't that important on your 912 with just a ground adjustable prop. I would set your prop pitch to get 5600-5650 rpm at WOT at your average altitude This will give you a good balance between cruise, climb and fuel economy.It sounds like you have more of a climb prop at 5100-5200 rpm at takeoff. I would also keep my cruising rpm over 5000 rpm and not down in the 4K range.

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


  • Re: Rotax 912ULS MAP

    by » 9 years ago


    Roger,
    why do you suggest keeping the cruise RPM at 5000K?
    Mike

  • Re: Rotax 912ULS MAP

    by » 9 years ago


    Hi Mike,

    Not at 5000 rpm, but above that. The engine is designed to run at the higher rpms. I would bet the average user now days with the better education since LSA aircraft is 5100-5300 and could run 5500 all the time.

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


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