Aircraft Mass & Balance Tutorial - PPSC

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The magnitude of the pitching moment will depend on the magnitude of lift and weight forces, but also on the distance between the centre of gravity and the centre of pressure. 27. The position of the C of G will depend on the way in which the aircraft is loaded, and on the manner in which fuel is transferred/consumed in flight. The position of the centre of pressure depends on the angle of attack, with the C of P moving slowly forward as the angle increases, and then rapidly backwards at the stalling angle.

9 inches aft of the datum. Chapter 3 Page 16 © G LONGHURST 1999 All Rights Reserved Worldwide Weight and Balance Theory EXAMPLE 3-3 EXAMPLE The datum is positioned between the nose and the main wheels of a single engined light aircraft. The nose-wheel is 45 inches forward of the datum and the main wheels are 55 inches aft of the datum. The weights measured through each wheel are: Left Hand Main Wheel 810 lb. Right Hand Main Wheel 815 lb. Nose-Wheel 320 lb. Determine the weight of the aircraft, and the position of the aircraft CG relative to the datum.

27. The position of the C of G will depend on the way in which the aircraft is loaded, and on the manner in which fuel is transferred/consumed in flight. The position of the centre of pressure depends on the angle of attack, with the C of P moving slowly forward as the angle increases, and then rapidly backwards at the stalling angle. 28. It is rarely possible to design an aircraft in which the forces of lift, weight, thrust and drag are exactly in equilibrium in flight. The centre of pressure moves with changing angle of attack, as does the drag line.

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