전방무게중심 허용치 변경에 의한 유상하중 증대법 = Alternate Forward Center of Gravity Limits for Improved Payload

다국어 초록 (Multilingual Abstract)

Alternate Forward CG Limits are potentially, ①increase allowable takeoff weight limited by field length, climb and obstacle ②permit greater use of reduced thrust, that means to increase engine reliability and to reduce engine maintenance costs. The four basic forces acting on the airplane are thrust, drag, weight and lift. The primary components of the total airplane lift are the lift produced by the wing minus the downward force required by the horizontal tail to offset the nose-down moment produced by the wing lift. For an airplane in stabilized flight the total airplane lift equals the wing lift plus the (negative) tail down load. Moving the airplane CG forward will require an increase in the downward force from the horizontal stabilizer to balance the airplane and a corresponding increase in wing lift to maintain the same total airplane lift. Conversely, moving the airplane CG aft will require a decrease in the downward force from the horizontal stabilizer to balance the airplane and a corresponding decrease in wing lift to maintain the same total airplane lift. If less lift is required from the wing at aft CG in order to produce the same total airplane lift ①at a constant angle of attack, the required total airplane lift can be produced at a slower speed ②at a constant speed, the required total airplane lift can be produced at a lower wing angle of attack.