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Old 02-16-2008, 02:17 AM   #14 (permalink)
bzipitidoo
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flap

I prefer passive designs. How about a flap or flaps hinged on top, and the hinges spring loaded? Or go with a living hinge. Fully open is tilted slightly, not horizontal. Air pushes them shut, so the slower you go, the more open they are. For an extra bit of fanciness, could make the stiffness temperature sensitive too.
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