Discussion
A rear-mounted engine sits \( 2.6 \) m from the centreline and produces the same \( 95 \) kN. Its engine-out moment compared with a \( 7.0 \) m wing mounting is
Answer: B
Correct answer: 37 per cent as large
The moment is proportional to the arm, so the ratio is the ratio of the arms:
\[ \frac{2.6}{7.0} = 0.371 \]
The rear-mounted engine produces only 37 per cent of the wing-mounted moment for the same thrust. That is the central argument for rear-fuselage installation: a much smaller fin and rudder, and a lower minimum control speed. It is paid for with an aft centre of gravity, a heavier rear fuselage and the loss of wing bending relief.
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