How much does an eagle weigh? and How can an eagle fly? (scientifical reason)?

Question

I want to know how can birds fly . Is there any special material or element in their wings? and How is an eagle's body structure ?

Answer 1

The fundamentals of bird flight are similar to those of aircraft. Lift force is produced by the action of air flow on the wing, which is an airfoil/aerofoil. The lift force occurs because the air has a lower pressure just above the wing and higher pressure below.

When gliding, both birds and gliders obtain both a vertical and a forward force from their wings. This is possible because the lift force is generated at right angles to the air flow, which in level flight comes from slightly below the wing. The lift force therefore has a forward component. (Weight always acts vertically downwards and so cannot provide a forward force. Without a forward component, a gliding bird would merely descend vertically, exactly as a parachute does).


Forces acting on a wingWhen a bird flaps, as opposed to gliding, its wings continue to develop lift as before, but they also create an additional forward and upward force, thrust, to counteract its weight and drag. Flapping involves two stages: the down-stroke, which provides the majority of the thrust, and the up-stroke, which can also (depending on the bird's wings) provide some upward force. At each up-stroke the wing is slightly folded inwards to reduce upward resistance. Birds change the angle of attack between the up-strokes and the down-strokes of their wings. During the down-stroke the angle of attack is increased, and is decreased during the up-stroke.

There are three major forces that impede a bird's aerial flight: frictional drag (caused by the friction of air and body surfaces), form drag (due to frontal area of the bird, also known as pressure drag), and lift-induced drag (caused by the wingtip vortices).

Answer 2

Eagles range in weight...the heaviest eagle, the Harpy Eagle, can weigh up to 20lbs.

Like all birds, eagles have hollow bones that subtract from their overall weight. The wing is the major flight component. It's in the shape...air moves faster over the top of the wing and slower under it and that generates lift. The feathers also play a big part by making the wing more streamline. They also have powerful muscles in their breasts(as do all flying birds) to help pump their wings.

Answer 3

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