Answer of the last question: Deployment of flaps cause: (2) nose down pitching moment (This however is not true for every aircraft. Flap extension has a definite effect on the airplane’s pitch behavior. The increased camber from flap deflection produces lift primarily on the rear portion of the wing, producing a nose-down force. This pitch behavior varies on different airplane designs. In general, though: • Flap deflection of up to 15° primarily produces lift with minimal drag. The airplane has a tendency to balloon up with initial flap deflection because of the lift increase. The nose down pitching moment, however, tends to offset the balloon. • Flap deflection beyond 15° produces a large increase in drag. In high-wing airplanes, a significant nose up pitching moment can occur because the resulting downwash increases) the airflow over the horizontal tail.
Posted on: Fri, 04 Jul 2014 05:47:17 +0000
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