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  1. R

    schrenk approximation

    We plan to build 3 planes and do as much flight testing as possible in the given amount of time we have. You are correct that MANY teams show up to the competition and crash their plane on the first flight. We are trying not to be one of those teams...
  2. R

    schrenk approximation

    After some generous help from wsimpso1, I was able to create more accurate shear and moment plots for the plane considering the following specs wingspan 5.833 ft wing area 6.8 ft^2 constant chord length of 1.1667 ft (14 inches) take off weight 25 lbs Schrenk Lift 2(25)=50 lbs, considering 2 g...
  3. R

    schrenk approximation

    I have to build it. Trying to learn aerodynamics to the best of my ability as I go, was assigned a project I have no previous education on.
  4. R

    schrenk approximation

    _
  5. R

    schrenk approximation

    Attached is my excel file containing the schrenk approximation and corresponding plots
  6. R

    schrenk approximation

    either is fine with me
  7. R

    schrenk approximation

    PM sent.
  8. R

    schrenk approximation

    thanks! will you post the plots here? our would u like to email them to me?
  9. R

    schrenk approximation

    Well our fuselage is still under design as well. However I can tell you it will roughly be a square shape with about 10 inch sides and 36 inches long overall. Wing will be top mounted. Straight wing (tip chord=14 inches, root chord =14 inches). Selig 1223 airfoil.
  10. R

    schrenk approximation

    One piece cantilever wing that will be mounted on top the fuselage.
  11. R

    schrenk approximation

    Well, considering we do not plan to do any extreme maneuvers in the air; only take off, make a large circle in the air, then land, per competition requirements. What do you recommend for a conservative g force guess? My aerodynamic "common sense" knowledge is very small to say the least
  12. R

    schrenk approximation

    That would be much appreciated! Is it possible you can also plot the moment and shear diagrams along the semi span? I have plotted the schrenk spanwise lift distribution, moment distribution and the shear distribution. Being able to compare your findings to mine would help very much, currently...
  13. R

    schrenk approximation

    Does anyone have a schrenk approximation excel spreadsheet set up? I created my own using the info found in the link below. http://www.lightaircraftassociation.co.uk/2010/Engineering/Design/schrenk%20approximation.pdf I'd like to compare my findings to another spreadsheet if possible.
  14. R

    Spar Sizing

    I've researched a few, do you have any recommendations? The spar must be wood, no composites allowed.
  15. R

    Spar Sizing

    Thank you all very much for the advice. With your advice I made some new calculations. Here's some more info on my plane design. It's being designed for a school competition, that requires a plane to carry a very large cargo weight. Basically, a plane that just barely flies. The smaller the...
  16. R

    Spar Sizing

    I am designing a model airplane and plan to use a spruce spar. I used the schrenk approximation to calculate the the moment and shear stress along the semi-span. I found the moment at the wing root to be 2681 lb-in, which seems about right considering review of other design reports. For...
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