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The statement "If, for example, a glider's weight is increased by 50% by water ballast, then the forward speed together with its sink rate will also increase by about 50%." is inaccurate. The speed and sink rate go up by the square root of the increase in wing loading, so if you double the gross weight (thus doubling the wing loading (weight/wing area)), the sink rate and speed only go up by a factor of 1.41 (or 41%). I don't have the references handy, but I know this to be true. It's used throughout soaring both full scale, and radio controlled.
24.8.219.134 ( talk) 09:16, 16 February 2009 (UTC)
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