Pressure effects still take place. Pressure is just force divided by area. If a net force (lift) exists, then a pressure differential must exist per newton's th

Pressure effects still take place. Pressure is just force divided by area. If a net force (lift) exists, then a pressure differential must exist per newton's third law. A flat plate at a positive alpha has both a pressure and speed differential across the upper/lower surfaces, see http://www.windsofkansas.com/AZ2Fig5.jpg http://www.windsofkansas.com/AZ2Fig5.jpg