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The primary sizing case for the vertical tail on a multi-engine transport is usually

  • A.Cruise directional stability
  • B.Spin recovery
  • C.Ground handling in a tailwind
  • D.Engine failure at the minimum control speed

Answer: D

One engine out at low speed produces the largest asymmetric yawing moment the aircraft will ever meet, and the fin and rudder must balance it with enough left over to manoeuvre. The certified minimum control speed follows directly from that balance.

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