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drag

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  1. Marc Zeitlin

    I've gone soft - need help on some aero

    I need some guidance on an aerodynamic calculation (and not a particularly complex one, but I'm still flummoxed). I'm actually looking for the math to use here - not handwaving or qualitative arguments - I need the actual quantification :-). Here's the question. Assume I have two airplanes -...
  2. A

    Understanding Induced Drag

    I'm trying to understand the drag and thrust curves of the plane I'm building. Profile/form drag - no problem. My sticking point right now is induced drag. All of the graphics on the topic show induced drag decreasing rapidly with increasing speed. But the equations I find on the subject, as...
  3. V

    Increase wingspan for less drag/higher cruise speed?

    The question: Is there a way to figure out if an increase in wingspan is likely to decrease the drag of a particular design, and at what altitude that might happen? The background: The Vision design can be built in two versions: a shorter-wing "SP" and a longer wing "XP". The designer...
  4. V

    Drag reduction: If/how to close the gaps between wheel and wheelpant

    I've noticed that many airplanes (certified and otherwise) have quite a gap between the wheels and the wheelpants. Obviously, the wheel/tire needs some room to flex, but a big gap has got to have a drag penalty. Do racers and others fret over this? Maybe bridge the gap with some flexible...
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