0
A wing creates lift by imparting a downward momentum to the air flowing above and below it. The rate of change of momentum is equal to Force (Newton's 2nd law), and therefore a reaction force pushes the wing up, producing lift (Newton's 3rd law).
The act of imparting a downward momentum ("downwash") to the air results in an air pressure differential around the wing. If you know the pressure above the wing and the pressure below the wing, and the wing area, you can calculate the lift force on the wing since Force = Pressure x Area. If you don't know the pressures, you can get a rough estimate if you know what the average air velocities are above and below the wing. By employing Bernoulli's Principle, you can calculate a pressure difference corresponding to the difference in velocity.
Note that there is no requirement that the air molecules separating at the leading edge and flowing below the wing meet up with the same molecules that flow over the top. This is called the "equal transit time theory" and is a popular science myth that unfortunately has found it's way into flight manuals and even some undergraduate texts. However, aerodynamicists have known ever since they started doing wind tunnel testing that the air flowing over a lifting wing reaches the trailing edge sooner than the air below it. This can be explained in terms of the circulation theory, which is an advanced concept.
Please see the excellent link below for more information:
- http://www.av8n.com/
Wiki User
∙ 14y ago
Wiki User
∙ 14y agothe differences in pressure above and below the wings as a bird moves through the air produces an upward force that cause the bird to rise and the upward force is a lift
Wiki User
∙ 15y agoIt is because of their wings and the wind turbulence that passes them.
Add your answer:
Earn +20 pts
Can bird fly backwards?
The only bird that can fly backwards is the humming bird'
Do owls teach their baby's how to fly?
I would think the mom bird teachs the baby bird to fly so the baby bird knows how to fly and take care of the baby the bird will have when it grows up so it can fly and take care of itself and the baby it has if it has one ^____^.
What bird cant fly backwards?
Jay bird
Is penguin a fish?
no its a bird. it can not fly though
Which bird can fly underwater?
No bird can fly underwater, it would be swimming. An example would be a duck.
what type of flight causes birds to rise in warm air?
It is caused when a bird runs into warm air and it causes it to fly. About any bird will fly when they run into warm air, except the ones that can't fly.
Why can a bird fly but a fly can't bird?
Its because fly is both a noun and a verb, so it can be done, and in this case a bird happens to be able to fly. But sadly, bird is a noun and not a verb, so you cannot bird.
How do you fly to the moon on fly like a bird 3?
I dont think you can fly to the moon on fly like a bird 3 but people say you can on fly like a bird 2.
Can bird fly backwards?
The only bird that can fly backwards is the humming bird'
What is the name of the upward force that enable a bird to fly?
It is called Lift. The difference in pressure above and below the wigs as a bird moves through the air produces an upward force that causes the bird to rise.
Does the ptarmigan bird fly?
yes it does fly i think.the only bird that doesn't fly is a ostrich and penguin
What are some games similar to fly like a bird 3?
fly like a bird 1 and fly like a bird 2
Which is the biggest bird that cannot fly?
the biggest bird in the world is the ostrich, and it cannot fly
How would a bird fly?
By flapping it wings causing enough momentum for the bird to fly.
Which bird is the smallest bird that can fly?
Hummingbird
When was Fly Like a Bird created?
Fly Like a Bird was created on 2006-03-13.
Are there any bird based virtual worlds?
only fly like a bird, fly like a bird 2 and 3 that i noe of
