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Old 11-19-2005, 06:15 PM
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da Rock
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Join Date: Oct 2005
Location: Near Pfafftown NC
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Default Figuring neutral point on biplane

I noticed a link to a decent little application that figures a bunch of the a/c design formulas for you. One of the things that saved me a bunch of time is it's ability to figure your stability margin for you. It saves a bunch of time working all that out on paper.

I've used it for a couple of ARFs that seemed to have "bad" balance points specified in their builder's manuals. And now I'm sticking together an Ultimate and figured to check the application's solution for the balance point, but I'm stumbling over the biplane problem. Can't think of a way to describe "the wing" to the application that'd fake it into doing the math for one wing (which is what it wants) yet give a good solution for the two that're actually there.

I guess I need to dig out the Aerodynamics books, but really don't want to. Everytime I disturb those book cases the dust cloud covers half the house.