Discussion
A nacelle of \( 3.2 \) m diameter hangs so that its centreline is \( 2.1 \) m above the ground. The clearance beneath it is
Answer: C
Correct answer: 0.50 m
Subtract the nacelle radius from the height of its centreline:
\[ c = 2.1 - \frac{3.2}{2} = 2.1 - 1.6 = 0.5\ \mathrm{m} \]
Half a metre is tight, and it is the static figure - the working clearance is less once the oleos compress, the tyres deflect and the aircraft banks or the wing flexes. This is the constraint that grows harder with every increase in bypass ratio, and the reason nacelle bottoms are often flattened.
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