It would be Knightfall for Batman to actually try to glide using his
cape. Physics students at the University of Leicester have calculated
that he wouldn’t be able to survive the aerial maneuvers displayed in
the movie
Batman Begins:
Due to the high speeds he would be travelling, his impact
with the ground would be equivalent to him being struck by a car
travelling at 50 miles per hour.
David Marshall, Tom Hands, Ian Griffiths and Gareth Douglas found
that the wingspan of Batman’s cape — at 4.7 metres — is around half that
used by a hang glider.
If Batman jumped from a building 150 metres high, he could glide a
distance of around 350 metres — but the problem arises as Batman’s
velocity increases during his descent.
His velocity would initially rise to around 68 miles per hour, before
reaching a steady 50 miles per hour as he gets down to ground level — a
speed too fast for him to land safely.
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