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Yes, British F-35 engines must be sent to Turkey for overhaul

Holtsmark

If you turn the aircraft upside down, the air flowing over the upper (formerly lower) surface of the wing will still flow faster. This can be acheived by most airfoils (including a flat plate) by adjusting the angle of attack properly (point the nose of the aircraft somewhat upwards). If memory serves me right, approximately 2/3 of the lift is generated by suction over the upper surface (air flowing faster than ambient airflow) and 1/3 by overpressure (air moving slower than ambient airflow) over the lower surface. This again varies with the airfoil in use.

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