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Seems like it shouldn't be too hard, but none of us has done it yet...
I think a scoop doesn't have to be that big, and you can make an exhaust valve so once it's inflated it exhausts excess air like these inflatable funhouses or tennis courts. The thing about a parachute is its huge opening. Maybe as the bag inflates it also has a mechanism inside that pushes a flap into the intake scoop to close it off??
I'm just the idea man, not the engineer...
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