Which CG location influences the tail force direction for equilibrium?

Which CG location influences the tail force direction for equilibrium?

• A. CG position
• B. Wing area
• C. Fuselage length
• D. Engine power

Answer: (A)

Equilibrium is set by balancing pitching moments about the center of gravity. The center of gravity fixes where the weight and the wing lift create moments relative to the plane’s balance point, and the tail’s force provides the counter-moment. If the CG is moved forward, the aircraft tends to nose down, so the tail must push downward to produce a nose-up moment and restore balance. If the CG is moved aft, the aircraft tends to nose up, so the tail must provide upward lift to produce a nose-down moment. In short, the CG position determines the required direction of the tail force to achieve equilibrium. Wing area, fuselage length, and engine power affect overall trim margins but do not dictate the tail force direction in the trimmed state.

Equilibrium is set by balancing pitching moments about the center of gravity. The center of gravity fixes where the weight and the wing lift create moments relative to the plane’s balance point, and the tail’s force provides the counter-moment. If the CG is moved forward, the aircraft tends to nose down, so the tail must push downward to produce a nose-up moment and restore balance. If the CG is moved aft, the aircraft tends to nose up, so the tail must provide upward lift to produce a nose-down moment. In short, the CG position determines the required direction of the tail force to achieve equilibrium. Wing area, fuselage length, and engine power affect overall trim margins but do not dictate the tail force direction in the trimmed state.