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Elevator Flap Issue

2017-04-06
2017-04-06
  • Charles Alver

    Charles Alver - 2017-04-06

    Hi,

    I have done some analysis on my plane without any control surfaces first but when I put an elevator in my horizontal tail with a ZERO deflection angle (so nothing has really changed since there's no deflection), the behavior of the graph or the performance curve is completely different. Why is that so?

    Please help. Thank you.

     
  • André

    André - 2017-04-06

    There is no reason for type 1 and 2 polars to be different with a zero deflection angle.
    If it's a type 7, the analysis will automatically switch to inviscid if there is a flap defined, even if its deflection is zero. This will change the drag and the moments.

     
  • Charles Alver

    Charles Alver - 2017-04-07

    Thank you Andre for the response! Yes, that's why I am confused why they are different. Im using type2 (fixed lift) for the analysis. Attached pic is the graph. Trial 8 (no elevator flap) and Trial 8 with elev 0 deg (with flap - 0 deg).

     
  • Charles Alver

    Charles Alver - 2017-04-10

    Mr. Andre,

    This is my xflr file by the way. I hope you can help me find the problem or explain to me why the two configurations have different performance curve.
    

    Thank you.

     

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