Discussion
An intake of area \( 0.8 \ \mathrm{m^2} \) captures a streamtube of \( 0.6 \ \mathrm{m^2} \) at cruise. The capture area ratio is
Answer: A
The ratio is \( 0.6/0.8 = 0.75 \), meaning the streamtube expands towards the intake as it decelerates. External diffusion of this kind is normal at cruise but must be kept modest, since excessive turning invites separation at the lip.
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