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Old May 24, 2012, 09:03 PM
NACA0012 is offline
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Check for warps. ARF wings aren't always straight or consistent. People also sometimes botch gluing wing halves together and make something that resembles a propeller. I've seen a few cubs go in that way.

If you're not good at eyeballing warps from the backside, some 3' yardsticks or (straight) balsa strip stock taped under the wingtips and near the wing root will give you a good reference looking from the side regarding wing twists. With a 3' extension sticking out, even warps that are only 1/32 or 1/64" at the TE get amplified into something visible.
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