Discussion
A fin \( 6 \) m from the centre of gravity must trim a yawing moment of \( 960 \) kN m. The side load it must produce is
Answer: A
Dividing the moment by the arm, \( 960/6 = 160 \) kN. That load is reacted through the fin spars into reinforced rear fuselage frames, and the shell carries the resulting torsion forward, which is why the rear fuselage of a twin is so noticeably strengthened.
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