At the risk of being a boring twat*
...having a flat plate wing which is angled to the flow of air (known as the Angle of Attack) does by it's very nature create a pressure differential resulting in lift. An aerofoil section just makes this phenomenon more efficient. If lift was purely as a result of the wing section, it would be impossible for aircraft to fly upside down.
*I admit to failure, and hereby hold my hand up as a boring twat.
But at least I don't find the need to shriek hysterically at 140dB when I see a model aircraft in flight.
(, Sat 23 May 2015, 8:05, Share, Reply)