Discussion
A rubber engine is scaled from \( 100 \) kN to \( 120 \) kN thrust. If engine weight scales with thrust, its weight rises by
Answer: B
Correct answer: 20 per cent
With weight scaling linearly with thrust,
\[ \frac{120 - 100}{100} = 0.20 = 20\% \]A rubber engine is a notional engine scaled to whatever thrust the sizing loop asks for, with its weight, dimensions and fuel consumption scaled by simple rules. It lets the loop close without waiting for a real engine to be selected, and it is replaced by a fixed engine deck once a manufacturer is chosen.
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