Discussion
An engine's gross thrust is \( 45 \ \mathrm{kN} \) and its ram drag is \( 18 \ \mathrm{kN} \). Its net thrust is
Answer: D
Correct answer: 27 kN
Net thrust is what the airframe actually receives:
\[ F_n = F_g - F_{ram} = 45 - 18 = 27 \text{ kN} \]Ram drag is the momentum of the incoming air, \( \dot{m}V_0 \), which the engine must first arrest; it is zero at rest and grows with flight speed. This is why an engine’s static rating always exceeds what it delivers in cruise.
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