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    Propeller - need to calculate the area

    If I am not mistaken, propellers are designed with a particular airfoil profile. This site: http://www.aerodyndesign.com/PROP_10/PROP_10.htm has both a PDF and the Excel sheet for a NACA 4412 airfoil. Therre are several other pages and the forum may be helpful to you as well. This site used to...
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    Have you ever asked yourself what would happen if you drill a hole into the earth's s

    The gravity component is an excellent calculus problem..... There's a bit of thermo...some fluid mechanics...a bunch of free body diagrams...several chapters of a good physics book...and a lot of educated guesses. This is a 3 pizza problem. I'm going to Dominos.
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