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  1. DoubleGeek

    Thick sail

    If you add camber, you're not really looking for 0012 characteristics. With NACA 4-digit airfoils, the first digit expresses the camber in percent chord, the second digit gives the location of the maximum camber point in tenths of chord, and the last two digits are the thickness in percent...
  2. DoubleGeek

    Modelling a steel top flange and concrete deck in FEA

    It really depends on what you're trying to model, but if it's going to be a real bridge, then it won't truly be "continuous". Typically for a bridge structure, you're looking for load deflections or critical stress points due to external loads. If so, try building a half-span and...
  3. DoubleGeek

    Flowchart or VB routine

    Try one of these... http://www.ece.utk.edu/~gdp/Lecture2.pdf http://cdeagle.cnchost.com/ http://www.rpi.edu/dept/epe/SURGE34685/trancal2.bas If that doesn't help, tell us why so we can narrow the search for you.
  4. DoubleGeek

    Pusher Vs Tractor configuration

    I'm not prepared to provide ALL merits of the pusher configuration over tractor, but let's start with my favorites and limit the discussion to a single-engine. First of all, the tractor configuration gets demerits for contaminating the fuselage with a noisy, vortex-laden propwash that changes...
  5. DoubleGeek

    Race Car End Plate-cutout vs full

    As a graduate AE - not an authority on this subject, I have two observations. The image appears to have three rivets across the median of the end plate, so maybe the area above and below this line has been balanced to minimize the torque-effect of having one side much larger than the other. This...
  6. DoubleGeek

    Wind Tunnel Vibration

    If you want a good test, you can't be fixing your air flow with other devices that could introduce even more perturbations. I wouldn't waste your time or money. If you are getting a low-frequency "surge" type oscillation, where flow velocity is unsteady, then I would look for any...
  7. DoubleGeek

    Thick sail

    The Eppler E395 was designed for low-speed, human-powered flight, so it probably has good lift characteristics in the speed range you're interested in, however, it is a cambered airfoil, so it is designed to always be lifting in the same direction. If you build your sail with camber, you'll be...
  8. DoubleGeek

    Wind effect on a flying ball

    For starters, here's a reference on the basics of your problem: http://entertainment.howstuffworks.com/physics-of-football2.htm. Even though the above is phrased as a punting problem with an (American) football, the solution for your first question is the same. The problem with predicting the...

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