Question

Science when birds remain airborne and moving without flapping their wings, on what are they gliding?

Answer 1

Soaring is a science when birds remain airborne and moving without flapping their wings. They are maintaining thrust and gliding downward but staying aloft

Further explanation

Soaring birds is where the birds can maintain flight without wing flapping, because they using rising air currents. Many gliding birds are able to lock their extended wings by means of a specialized tendon. Some land birds such as vultures and certain hawks, sustain flight for long periods without flapping their wings.

For example soaring California Condor spreads its primary feathers so that each acts as a small, high-aspect-ratio wing. This reduces turbulence at the wingtips and helping the condor to stay aloft circling slowly in thermals.

Vultures have a low aspect ratio (ratio of length to width of the wing) which generally produce a lot of drag. Vultures overcome the problem of by flying with their primary feathers extended, creating slots between them. Each primary serves as an individual high-aspect-ratio wing. This high-aspect-ratio reducing wingtip turbulence and lowering the stalling speed of the wings. This helps vultures to circle in thermals, maintaining thrust by gliding downward, but staying aloft by sinking at a rate slower than the hot air rising.

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Answer details

Grade:  9

Subject: biology

Chapter:  animals

Keywords:  birds

Answer 2

When birds glide, they use their weight to overcome air resistance. To do this, the birds must have a certain mass. That's why, usually, large birds do the gliding motion like vultures. Here, the upward aerodynamic force by the air resistance is equal to the weight.