Discussion
A twin and a four-engine aircraft of equal total thrust are compared for fin sizing.
Which generally needs the larger fin, and why?
Answer: B
Correct answer: The twin, since losing one engine removes half the total thrust
With equal total thrust \( 4T \), the twin's engines produce \( 2T \) each and the four-engine aircraft's produce \( T \). Losing one leaves an asymmetry of \( 2T \) on the twin against \( T \) on the four.
Even though the four-engine outboard sits on a longer arm, the doubled thrust usually dominates: at 8 m and 12 m the moments are \( 16T \) against \( 12T \). Losing one of two is a far greater proportional loss than losing one of four, and that is what sizes the fin.
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