Question

how the human can fly in sky​

Answer 1

Answer:

says Drela, we have achieved one type of human-powered flight: using an aircraft with a fixed wing and propellers driven by leg pedaling. Because the wing is fixed, it can be built both long enough and light enough to permit flight. Around 100 airplanes like this have been flown to date.

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Answer 2

Answer:

Humans are not physically designed to fly. We cannot create enough lift to overcome the force of gravity (or our weight). It's not only wings that allow birds to fly. Their light frame and hollow bones make it easier to counteract gravity.