For a typical general aviation or commercial aircraft, the incidence is set so that the wing operates at its most efficient angle—often near the lift coefficient that produces the highest lift-to-drag ratio—during normal cruise flight. Similarly, on landing, the pilot must carefully control the descent attitude to ensure the main wheels touch down first, managing the angle of attack to avoid a dangerous bounce caused by excessive upward lift.
Correct Incidence Prevents Drag Rise
To counteract this and achieve a stable hands-off flight condition, the horizontal stabilizer is set to produce a downward force, effectively pushing the tail down. Impact on Trim and Stability The angle of incidence plays a pivotal role in the aircraft's longitudinal stability and trim.
This configuration causes the wing to generate more lift than the tailplane, which would naturally cause the nose to pitch up. If the incidence were set incorrectly, the aircraft would either require excessive tail-down force (creating induced drag) or be unable to maintain altitude at a comfortable cruise speed, forcing the pilot to use more thrust to compensate.
Correct Incidence Prevents Drag Rise
This balance ensures the aircraft flies level without requiring constant, strenuous control column pressure from the pilot. On takeoff, the pilot pulls back on the control column to increase the angle of attack, allowing the wing to generate the massive lift needed to become airborne.
More About Angle of incidence in aircraft
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