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What creates lift?

   
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seadogs
Trainee
Trainee

Pro Member

Joined: Jul 26, 2005
Posts: 64
Posted: Tue Feb 02, 2010 3:53 pm 

Hey

I have just started doing my ppl and just wanted to check if i have the concept of lift right. Is lift achieved by the venturi effect, where there is a low static pressure on top and a higher static pressure at the bottom of the wing. And it is the difference of pressure that creates lift?

Thanks
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99jolegg
Chief Captain
Chief Captain

Pro Member

Joined: Jun 26, 2004
Posts: 5424
Location: UK
Posted: Fri Feb 05, 2010 9:29 pm 

There are various theories to lift but yes, the most commonly accepted theory is the camber of the wing increases the speed over the top of the wing surface creating low pressure (suction if you like) whilst the slower speed of the air under the wing is at a relatively high pressure. The difference between them creates lift.

As you rotate the aircraft, and therefore increase the angle of attack (the angle between the chord line [line linking the leading edge to the trailing edge of the wing] and the relative airflow over the wing) the upwash ahead of the wing increases, air is sped up even more over the top of the wing, the pressure is even lower and therefore the differential is even greater so higher angles of attack (effectively high pitch angles) give higher lift.

The components of lift are Lift = 1/2 air density x velocity squared x coefficient of lift x surface area

Probably a little above PPL level but a bit of background info never hurts.
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