theory of flight
Remembering basic training................they said that lift is proportional to the square of the speed (Didn't they ?????)
On an ISA day, if I rotate a 747 weighing 200,000 kg to 15 degrees at 110 knots, the wings produce just over 200,000 kg of lift and we fly.
On the same day, the same aeroplane weighing 400,000 kg requires only an extra 67 knots to produce double the lift.
How does this fit into the V squared formula ????