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Old Oct 23, 2012, 04:13 PM
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Bruce,

It does have an odd movement and the gap opens up at the bottom, have a look at my build log, post #5 with the video shot from the underside of the flap. From a theoretical fluid flow point of view I do not expect this to be too much of an issue.

http://www.rcgroups.com/forums/showp...01&postcount=5

As long as you have a consistent small gap at the top to show the radius of the flap leading edge is correct then it will reman airtight. The pictures from above in that post have the flaps open much more than they do, they were just free hanging at that point.
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