I suspect that of being a photoshop job. Note, in particular, the angle of attack (the angle that the wing tips up relative to the horizontal) and the height above the water. The angle of attack is high enough to be unstable, and the altitude implies 20 minutes at least of climbing -- not likely.
I was at the "Transpo" event held at Dulles Airport in the 1970's when one participant flew a hang-glider towed behind a pickup truck. He would tip the nose of the glider up and down to show the audience he had control. The day after I was there, he tipped it up a bit too much, and it stalled. As Rush Limbaugh would put it, he "assumed room temperature" that day.
I don't doubt they can be built, and flown. I
do doubt that picture.
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