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  1. oriolbetriu

    Learning how to calculate secondary moment using Bruhn's

    Hi! I am trying to learn how to calculate secondary moment, so that I can analize properly any strutted wing. I am following Bruhn's example, please see pages below. I think that I understand, the way the formulas are deduced from the force diagram, which ends up in a secondary order...
  2. oriolbetriu

    How to calculate wing deflection?

    Hi rb1957! The current example is intended to cover a full analysis, but a very simplified one; the model can be improved by changing every parameter with later iterations/additioms. Regarding moments/Cm, I did something a bit against the rules. Instead of working with Cm, I have followed...
  3. oriolbetriu

    How to calculate wing deflection?

    Thanks rb1957! As a starting point, I am trying to calculate a moderate deflection, within the elastic range. Instead of the original cantilever wood wing, I have come up with a tube and fabric braceless structure, similar to that of the Goat homebuilt glider, which can be analized as a truss...
  4. oriolbetriu

    How to calculate wing deflection?

    Hi! I have a fundamental doubt regarding deflection on a 3D beam/wing. Given that Timoshenko only covers deflection for 2D structures. I am guessing that perhaps, you can calculate deflection in a 3D wing, as if it was a 2D structure. Once the values of EI are known for the beam/wing section...
  5. oriolbetriu

    How to calculate wing deflection?

    Hi mfgenggear! It seems that you had an engineering career that many dream of! In my particular case, I really enjoy the freedom of experimenting on my own in the shop, but I also admire the craftmanship and quality of certified aircrafts. Cheers, Oriol
  6. oriolbetriu

    How to calculate wing deflection?

    Hi mfgenggear! Thanks for the links! The internal structure of the Darkaero wing is very original. I just saw the video about it, the idea of cutting all the internal parts using a CNC machine seems wise. I have started building wood RC models to experiment. Wood is less messy than composites...
  7. oriolbetriu

    How to calculate wing deflection?

    Hi rb1957! The person that has been guiding me, has told me what you said; that some engineers skip analizing the rotated rectangles, and only use A*y^2 of parallel axis theorem. By creating this spreadsheet I have learned to work with Excel. I learned to program during my studies, but I...
  8. oriolbetriu

    How to calculate wing deflection?

    Thanks WKTaylor for the links! There were some of the documents on the list, that I did not knew about! Yes, wood is tricky. However you can run the calculations, with some estimative values gathered from ANC-18, or Frati's book etc. The most important thing to me, is to have a working method...
  9. oriolbetriu

    How to calculate wing deflection?

    Hi rb1957! I am working on an example of a self designed wood glider wing, which has a D-tube plywood and two spars, the ribs are mostly covered by fabric, that is ineffective skin or non structural skin. So far, the reference books I have used are Stelio Frati's The Glider, and Timoshenko's...
  10. oriolbetriu

    How to calculate wing deflection?

    Thanks SWComposites! I will finish Timoshenko's, and then start with one of the aero structures books you mention. Oriol
  11. oriolbetriu

    How to calculate wing deflection?

    Thanks rb1957! To make things easier, I am considering a flat lift distribution, and a constant spar and wing section/rectangular planform. I have calculated the moment of inertia of the different parts that make up the wing section, and located the resulting airfoil centroid, but I do not know...
  12. oriolbetriu

    How to calculate wing deflection?

    Hi! Albeit I studied aero engineering, I never finished my studies. I have been lately reading Timoshenko, to learn some beam theory basics. I can calculate deflection for a single beam, but I do not know how to calculate deflection for the whole wing? In fact, I can not even tell how to...

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