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Old 08-14-2011, 10:47 AM   #22
slipstick
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It's the prop size that's critical because it's the prop that creates the thrust. There are formulae available but they're quite complex involving motor losses, propeller efficiency etc so to get a good estimate of the thrust available most of us simply use one of the many motor calculator programs available, some online some not, some free, some not. See http://www.rcgroups.com/forums/showthread.php?t=606703 for a comprehensive listing of them.

Steve
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