Assuming a superhero was flying by air pushing against his feet, how fast would he have to go to stay airborne?
He is flying prone, superman style. Air is pushing his feet, and in turn the rest of his body forward through the air.
I want to know so their can be a lowest reasonable a superhero should be flying around in.
I am not counting hovering, since that is not for travel anyway. Their weight is average, like 150 pounds.