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Old Nov 27, 2005, 10:19 PM
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Georgia
Joined Mar 2002
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On the small planes we make out of 3mm foam I think the value of rounding leading or trailing edges is a moot point. The Re is so low and the flat edge is so small that I don't see how there could be a dramatic difference one way or the other.
I'm of the opinion that leading edges should be rounded on the heavier foamy planes and those where the thickness of the foam is more than 3mm, and trailing edges should be left square regardless of the thickness or size of model.
The flat or square trailing edge has become the solution on large aerobatic aircraft as it improves control authority, and can reduce flutter. Rounded trailing edges have been known to cause all sorts of trouble.
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