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Which geometry makes a diagonal split safe?

  • A.Zero camber
  • B.Ackermann steering geometry, which ensures that the two front wheels turn through the correct relative angles
  • C.Negative scrub radius at the front wheels
  • D.Positive castor, which returns the steering to the straight ahead and therefore counteracts the pull when braking

Answer: C

With negative scrub radius the braking force on the working front wheel steers the vehicle against the pull, which cancels most of it. Without that geometry a diagonal split failure would produce a violent swerve. The two developments arrived together. The order in which the effects act is what decides the outcome, so it is worth establishing first. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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