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Very low power settings

in 915iS Technical Questions 3 years ago

Hi! The next summer I will participate to a very long raid of 100hrs more or less with other airplanes much more slower than mine. To stay in pair with them I have estimated a power setting that consumes 12Lt/h, this should  be 35% more or less. 
There will be any problem maintaining this settings for a whole 100hrs? 
And there will be any problem using AVGAS maybe with Decalin? An oil change is programmed at 50hr. 
Thanks 

 

  • Re: Very low power settings

    by » 3 years ago

    The 915is operates with a Lean Mixture, so fouling should not be an issue.
    The issue might be, Can you fly Slow enough to keep up (Back?) with the pack.
    Also consider that below your VY speed, MORE power is needed the SLOWER you go.

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

      
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  • Re: Very low power settings

    by » 3 years ago

    Good to hear this Bill. Yes I will be more or less 1,3 - 1,4 times my Vy. 
    Thank you. 

      
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  • Re: Very low power settings

    by » 3 years ago

    So, what is it that you are flying that you consider 1.4 x Vy to be notably SLOW! 
    That sounds more like a casual cruise speed.
    I am picturing you trying to formation fly the 915 Turbo next to a Powered Parachute.

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

      
    Report

  • Re: Very low power settings

    by » 3 years ago

    Sorry for the delay in my answer. 
    The aircraft will be a Risen 915iS of Porto Aviation Group. The Risen 914 with standard wings did the world record at 379kmh over 50km course and 400kmh over 15km course. The 915 has even shorter wings. The Vy is 170kmh. 
    Best regards

      
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