why are we not able to fly
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Humans will never fly by flapping our arms with wings attached, says Mark Drela, Terry J. Kohler Professor of Fluid Dynamics in the Department of Aeronautics and Astronautics. The arms and chest of a human do not have anywhere near enough muscle mass to provide the necessary power
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A bird can fly because its wingspan and the wing muscle strength are in balance with its body size. It has a lightweight skeleton with hollow bones, which puts a smaller load on its wings. ... In other words, humans are not too large to fly, but our strength simply cannot support our weight in flight.
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