Consider an airplane with a total wing surface of 100 square meters (m2). At a certain speed the difference in the air pressure below and above the wings is 5% of atmospheric pressure. What is the lift force on the airplane in units of kN (kilo Newtons)?

Answer 1

atmospheric pressure is ... 101 kPa ... one Pascal is one N per m^2

lift force = .05 * 101 kPa * 100 ... N