Wing strut location.

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by redmudislander, May 23, 2019.

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  1. May 23, 2019 #1

    redmudislander

    redmudislander

    redmudislander

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    What dictates whether high wings with two struts per side should have the struts attached to the fuselage at the same location on the lower longeron, versus being kept parallel and attaching to the longeron at points separated by the distance between the wing spars?
    It seems an option here could greatly aid ingress and egress on some designs.
    Thoughts?
     
  2. May 23, 2019 #2

    FritzW

    FritzW

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    Probably just the era they were designed. V struts really took over after WW-II.
     
  3. May 23, 2019 #3

    wsimpso1

    wsimpso1

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    V struts can allow bigger doors, easier access, and wing swing (for compact storage) with less disconnections. The price for this is somewhat "less stiff" structure and modestly higher forces in the struts/wings/ longerons. The force increases are usually not enough higher to drive more weight. Even with upgauging of some elements, it is usually pretty small and worthwhile to make getting in and out easier. One other downside is that the resonant frequency of the wings in bending will be a tiny bit lower (due to less stiffness), which has some flutter and thus Vne implications - I suspect small ones.

    Are you designing a double strutted airplane? If yes, cool. If no, I advise that folks build to the plans unless you have both a "known problem" and a "known fix", then you build to the plans for the "known fix".

    Billski
     
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  4. May 23, 2019 #4

    Pops

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    Also can be easier to combine the attachments of the LG and struts in the lower fuselage structure.
     
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  5. May 24, 2019 #5

    Dan Thomas

    Dan Thomas

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    Parallel struts can allow more twisting of the wing in flight unless the crossbracing in the wing is exceptionally rigid, or flying wires are used betwen the struts, to prevent the resultant fore-aft movement of the wingtip. The V-strut design holds that wing more torsionally rigid.
     
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