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Power requirement of propeller

in 912 / 914 Technical Questions 12 years ago

  • Re: Power requirement of propeller

    by » 12 years ago

    Mike
    I totally agree with you, I was just trying to add a little background knowledge for those who might be interested.
    Mike G
    Thank you said by: mike hallam
      
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  • Re: Power requirement of propeller

    by » 12 years ago

    Hi Mike,

    I wish I was exaggerating a little, but I wasn't. I have seen and talked to people with a ground adjustable prop that think they can get better cruise or they just didn't know it was the wrong way to set up a prop. I have seen several LSA MFG's set up props to get no more than 5200 rpm WOT and many individuals set them up at 5100 for WOT. I get calls on this weekly and reset them all the time in the shop. It seems it is a well misunderstood issue with MFG's and individuals, but I think the word is getting out fairly well and people are making adjustments. This is one reason I wrote the article on prop pitch with the hopes that some might reconsider how they set their prop to achieve a balanced engine rpm/prop combination with a ground adjustable prop.

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

      
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  • Re: Power requirement of propeller

    by » 12 years ago

    Roger
    Sounds unbelievable to me but you've seen many more of these engines than I have so I take your word for it.
    It was an interesting discussion anyway.
    Mike
      
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  • Re: Power requirement of propeller

    by » 12 years ago

    Here are 4 SLSA MFG's and there are more that got it wrong in the beginning. (made for the US and ground adjustable props) I have changed pitch in these 4 aircraft and I would bet it has been well over 80 of them over the last 4 years. As the word gets out people are coming around. (not talking about in flight adjustable or special circumstance setups)

    Flight Design
    Allegro
    Remos
    Gobosh
    Sirius


    p.s.
    For the hardcore guys that don't think going from 5200 WOT to 5500-5600 WOT will make much difference. I always bet them that if they don't like it I'll put there prop back at 5200 engine rpm and all the work is free, but if they do like the change then they owe me $50. To the man not a single person has ever wanted to go back to 5200 WOT. 100% has stayed at the 5500-5600 WOT prop pitch/engine setup. Climb, cruise and fuel economy is better by quite a bit.

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

      
    Report

  • Re: Power requirement of propeller

    by » 12 years ago

    Roger
    It's just occured to me, when you say 5200 WOT is that a static ground run test or cruise?
    Mike
      
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