Discussion
A twin's engine is \( 7.5 \) m from the centreline and produces \( 110 \) kN of thrust. The yawing moment on failure, ignoring windmilling drag, is
Answer: A
The moment is thrust times arm, \( 110 \times 7.5 = 825 \) kN m. Adding the drag of the failed engine typically increases this by ten to twenty per cent, and the fin and rudder must be able to balance the total at the minimum control speed.
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