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Which suspension has the notorious jacking behaviour under hard cornering?

  • A.The trailing arm
  • B.The semi-trailing arm, whose inclined pivot axis produces a change of toe as the suspension moves through its travel
  • C.The swing axle
  • D.The double wishbone, whose upper arm can lift the body if it is made shorter than the lower arm beneath it

Answer: C

As the swing axle is compressed the wheel tucks under and the effective roll centre rises, lifting the body and increasing the camber change until the wheel tucks completely. Early Volkswagen and Mercedes designs suffered from it. Low pivot arrangements mitigated it. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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