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  1. rapidshot

    Questions from material specs to skin thickness

    4g, note the direction of strut to capture the compressive force in the spar
  2. rapidshot

    Questions from material specs to skin thickness

  3. rapidshot

    Questions from material specs to skin thickness

    No, it ended due to economical reasons, now working on a 600 kg lsa and about to test the wings under static loads
  4. rapidshot

    Wing skin deformations

    Good point
  5. rapidshot

    Wing skin deformations

    Thanks Pictsidhe, the skin doesnt take any bending, only the spar flanges,
  6. rapidshot

    Wing skin deformations

    When designing the skin metal plates of a light aircraft under pressure we get relatively high deformations, apart from aerodynamic considerations and shear buckling due to shear flow can we just use one of the design philosophy approximations to reduce deflections and avoid narrow rib spacing...
  7. rapidshot

    Simplified chord-wise pressure distribution

    Hi All, I saw this approach in Denis Howe’s “Aircraft Loading and Structural Layout”, i think it is very convenient for computerized calculations,
  8. rapidshot

    Shear flow in wing box and single strut

    Thank you,
  9. rapidshot

    Shear flow in wing box and single strut

    This box is 600 mm x 200 mm , sides are 3 mm, top and bottom 1 mm, ribs 1 mm thick, It doesnt look like an actual wing box but a quick model, torsional moments have arbitrary value uniformly distributed along span just to capture the behaviour,
  10. rapidshot

    Shear flow in wing box and single strut

    This is a simple box beam model to clarify my question, only torsional moments are applied, The one on the left is supported at its torsional center while the other one is supported at left spar, those green points around mid points of the box are the restraints, both have 2 hinges at the far...
  11. rapidshot

    Shear flow in wing box and single strut

    Thanks for your response, I think my question was misunderstood, i agree since strut has no bending stiffness and pin connected it shouldnt have any effect on the torsional stiffness of the box, may be a small amonuts due to rib at that point, but it certainly affects the rotations, the elastic...
  12. rapidshot

    Shear flow in wing box and single strut

    Hi all, I have been thinking on the subject for a while but couldn’t make an approach for hand calculations, Any recommendations are welcome, how does a single strut attached to front spar affect the shear flow in the box due to torsion, Do you think that shifting the elastic axis linearly...
  13. rapidshot

    Two of my excel files which you may find useful,

    Hi all, File: Aircraft Performance, limited with rectangular wings and 2 bladed props, no taper at all, contains Basic aerodynamics , Static thrust, In flight thrust Tail preliminary sizing Takeoff ground roll Rate of climb Range Neutral point, power effect is not considered because it shifts...
  14. rapidshot

    Question about Negative G's and load limits

    to me they are almost equal because base line is +1g, consider a +4g,-2g aircraft, absolute value of the increments are equal in both directions , 3 and 3
  15. rapidshot

    Determining Loading Points on a Tube Structure

    Hi, In addition to previous comments i would like to draw your attention to tail loads, the order of magnitude of the loads on the fuselage due to angular accelerations + balancing loads may be more critical than the landing loads, the loading conditions are well summarized both in FAR 23 and...
  16. rapidshot

    Attitude indicator , need help

    )) No, but lets call it a habit, i will fly internationally
  17. rapidshot

    Attitude indicator , need help

    Thanks TTF, i will check it
  18. rapidshot

    Attitude indicator , need help

    I am looking for an AI which should fit in my Stearman's rear seat panel, regular ones are long , can anyone recommend a brand and/or a shop for an AI which is shorter, Thank you
  19. rapidshot

    Wing Rib Spacing on Scaled Wings

    One more thing, the flutter issue The CG of the wing should not shift towards TE, more thoughts, if you keep the rib spacing equal to original one, the skin can remain the same, assuming the same wing loading and the same material properties, so that means you are on the safe side if i didnt...
  20. rapidshot

    Wing Rib Spacing on Scaled Wings

    to my opinion keeping the rib spacing same as the original one, you may not have to change skin thickness if they are not designed for torsional stresses , assuming that the pressure on the skin remains the same, if skin is designed for torsion , again to my opinion, the relation is not linear...
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