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At speed, you are pushing in air into the bag of air behind you. Once it maxes out (the PSI in the bag vs the PSI of air being pushed into it by wind speed) it should just go around and make a high pressure bubble, much like the grill of a car.
Now, I haven't really researched Mylar yet, so bare with me. Do you all know that stuff those "bounce" things are made out of? You know, those little things kids jump in that have a fan inflating them? That stuff is incredibly hard once inflated and seems to be rigid enough not to flop in the wind. You couldn't get it hard lol enough to lift it off the ground with your speed alone. ( I don't think ) So you would have to inflate it before you left, or with a small 12 volt powered fan. It could be sewn together and rolled up like a truck bed cover.
This thread has REALLY got my brain working and i'm really interested in making one.
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