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Don't even know if this is possible, but build one like a boat canopy with a light frame and canvas material. Attach a spring to it to retract it automatically on tension, but when the air pushes against it it unfolds on its own.
Now that is assuming that the air force would force such a device open, but when the resistance becomes minimal, the springs would retract it automatically.
Then again, I have been known to talk out of my ass ... LOL
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Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"
I am a precisional instrument of speed and aeromatics
If your knees bent in the opposite direction......what would a chair look like???
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