Originally Posted by
n5296s
I'd be very curious to see a wing without an upper surface, ghat could be used to test this. Maybe it's full of magnetic monopoles?
Many 1970s era ultralights or hang-gliders.
I've flown one or two, and can verify that they do fly - just not usually very well.
Search online for "Chotia Weedhopper" for a good example.
G