Grips From A/c Design- Longitudnal Trim Analysis..

Grips From A/c Design- Longitudnal Trim Analysis During Tail Design-

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  • The fuselage contribution for most conventional aircraft is usually about 5%
    C
    . Since the wing aerodynamic center is often located at about quarter mean aerodynamic chord (i.e. 25%C ), hence the wing-fuselage aerodynamic center is often located between 20 percent of MAC to 30 percent of MAC.The wing-fuselage lift (Lwf) is the wing lift (Lw) when the contribution of fuselage lift (Lf) is included.The fuselage lift is usually assumed to be about 10 percent of the wing lift. When the cg is aft of the ACwf , this moment of the wing-fuselage lift (Lwf) is positive, while when the cg is forward of the ACwf , this moment of the wing-fuselage lift is negative.The wing-fuselage a pitching moment (Mowf) is the wing pitching moment (Mow) when the contribution of the fuselage (Mf) is included.distance between horizontal tail aerodynamic center to the wing-fuselage
    aerodynamic center is denoted as l, while the distance between horizontal tail aerodynamic
    center to the aircraft center of gravity is denoted as=Mowf+lwf(HC-Hoc)-Lh.Lf=0.
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