Why are there no birds even close to the weight of adult human males? Why do birds have a huge keel-like breastbone on which equally huge and powerful flight muscles attach? If energy required to take of scales geometrically with weight, how much force would an adult human need to generate to take flight and which muscles, attached where on the human skeleton, would be used for this?
Flapping wings do not simply vibrate vertically. Wings are hinged so they can greatly reduce the amount of air they push back up on the up stroke and to generate significant amounts of lift it takes a really dramatic motion. You can see how bad the motion is by compare flapping motion 35 seconds in vs an actual bird.
Also, trying to generate the type of energy required for flight with your arms is significantly harder than your legs.
CrownStem|14 years ago
mcdillon|14 years ago
angersock|14 years ago
If it's so obvious, the math justifying your position should comfortably fit in an HN post.
bh42222|14 years ago
retr0rocket|14 years ago
onemoreact|14 years ago
Also, trying to generate the type of energy required for flight with your arms is significantly harder than your legs.