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  • Re: Think I need my prop repitched. Any suggestions?

    by » 8 months ago


    A very rough ball-park number would be about 200 rpm per degree of prop pitch change.
    You might want to reduce your pitch by about 1.5° to start, and then a half degree after that.

    Your performance will vary from day to day, so it might take a few flights before deciding to make the next change or you will end up chasing your tail.


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


    Thank you said by: Jonathan

  • Re: Think I need my prop repitched. Any suggestions?

    by » 8 months ago


    Roger Lee wrote:

    I personally haven't  tried or tested the E-Prop, but have some pretty savvy friends that really like it plus good comments on a few other forums. The Flight Design CTLSi in my hangar gets 5600 in level flight and his eco mode seems to be around 5350.

    Altitude has a lot to fo with engine HP / torque and you will lose these as you increase altitude. This is why I ALWAYS say set your prop pitch for your average altitude. A guy that lives in Florida at sea level and never goes over 2K ft. will have a different prop pitch compared to a guy that lives in Colorado, takes off at 7K ft.  and always flies at 10K+ ft.

    Roger that. I would say my average cruise altitude is 8.5, so I should pitch for 5500rpm at 8.5? 


  • Re: Think I need my prop repitched. Any suggestions?

    by » 8 months ago


    Why don't you just start with Rotax recommended STATIC, 5200rpm.  Its the conservative/safe way to go and it can all be done on the ground.

    When you have it right  - go flying.

    Take note of ground role/accelerin/rpm,

    Climb performance/air speed/climb rate between 5200-5800 rpm (control rpm with attitude)

    Cruise between 5100- 5500 rpm and record air speed against engine speed.

    This is called establishing base line.

    From the above data, you will be able to make informed decisions about prop pitch changes, to suit your aircraft and your objectives.

     


    Thank you said by: Jonathan

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