Discussion
A turbofan of \( 300 \ \mathrm{kg/s} \) total flow produces \( 60 \ \mathrm{kN} \). Its specific thrust is
Answer: A
Correct answer: 200 N per kg/s
Specific thrust is thrust divided by air mass flow:
\[ F_s = \frac{60\,000}{300} = 200 \text{ N per kg/s} \]Two hundred is typical of a high bypass turbofan, which makes its thrust from a large mass of air given a small velocity increment. A turbojet works near 800, passing a quarter of the air at four times the increment, which is why it is so much smaller and so much less efficient at subsonic speed.
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