The airplane can take off when its airspeed (speed of the air flowing over the wing) is equal to 65 knots. What is the length of runway required for the plane to take off if there is a 25 knots head wind? The runway at the Tallahassee Regional Airport has a length of 8000 ft.

Answer 1

If the airplane faces a constant headwind of 25 knots, the airspeed starts at 25. So a minimum ground speed of 65-25=40 knots will be required.
Without a knowledge of the charactistics of the airplane, it would not be possible to calculate the length of the runway required. It depends on the maximum acceleration of the equipment, the loading, etc.