How strong would wings have to be to carry a human?
How strong would wings have to be to carry a human? In order to generate enough power to lift our heavy human bodies, we would need a wingspan of at least 6.7 metres and our arm and chest muscles would have to be colossal … making our body, as a result, too heavy to lift.
Why did humans not evolve to fly?
And now, scientists have determined that we never will: it is mathematically impossible for humans to fly like birds. 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.