A very good Q AM. *Btw, weve just lost 99% of the readership at this point. *Hahaha.Originally Posted by 527D7476615E727D7274767E767D67130 link=1249113398/0#0 date=1249113398
Anyway, there are 3 components to how much lift a wing generates:
Angle of Attack - the angle between the wing and the airflow. Think about driving with your flat hand out the window, into the wind....and then angling your fingertips higher than your wrist....voila an upwards force)
Airspeed - Self explanatory; and
Camber - How curved the wing is.
There isnt an aircraft made that cant fly upside down (google Tex Perkins Roll Boeing 707 for a good read) however those that are made to do it (fighter jets, aerobatic aircraft, etc) have almost zero camber. *Their wing is near, if not perfectly symmetrical. *In the absence of camber, their lift is derived from airspeed and angle of attack alone. *
Now, remember that first hand dangerously out the window of a car experiment? *This time angle your hand down and voila....a downwards force. *A good example of a symmetrical aerofoil (your hand) changing the angle of attack (from below your hand to above your hand) to create lift in opposite directions.