Discussion
At sea level an engine produces \( 120 \ \mathrm{kN} \). At a density ratio of 0.30, assuming thrust scales with density, it produces approximately
Answer: D
Correct answer: 36 kN
\[ 120 \times 0.30 = 36\ \mathrm{kN}. \] Thrust is proportional to the mass flow the engine can swallow, and that is proportional to the density, so a density ratio of 0.30 leaves 30 per cent of the sea level thrust. It is why an engine that is comfortably powerful at sea level becomes marginal at altitude, and why cruise altitude is limited by thrust as much as by anything else.
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