![]() ![]() The plane may accelerate along the ground at a given angle of attack (or lift coefficient) until the speed reaches the point where the dynamic pressure combines with the lift coefficient to give lift equal to the weight or it may accelerate at some angle of attack determined by its landing gear height until it reaches a speed which will give lift equals to weight when the aircraft is then rotated (tail down, nose up) to a higher angle of attack and lift coefficient.Īny pilot will tell you that take‑off and landing are what flight is all about. The thrust must exceed drag for acceleration to take place and the lift won’t equal weight until the moment of liftoff. In take-off, the airplane accelerates from zero groundspeed (but not necessarily zero airspeed!) to a speed at which it can lift itself from the ground. We will also have a couple of new forces to consider in the ground reaction force and ground friction. ![]() If we are to look at the performance of an airplane during take‑off and landing we must, for the first time, consider acceleration (during takeoff) and deceleration (during landing). Even in climb and descent we assumed “quasi-level” conditions where the forces on the aircraft summed to zero. ![]() To this point, all of our discussion has related to static or unaccelerated flight where F = ma = 0. Accelerated Performance: Takeoff and Landing Introduction ![]()
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