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Which frame type consists of many small tubes forming a triangulated structure?

  • A.The monocoque, in which the stressed skin carries the loads without any internal framework being required at all
  • B.The space frame
  • C.The backbone frame, which instead relies upon a single large tube running along the centre line of the vehicle
  • D.The ladder frame

Answer: B

A space frame builds the structure from many small tubes arranged so that each carries only tension or compression, which is extremely efficient in stiffness per unit weight. Triangulation is essential, since an untriangulated bay deforms as a parallelogram. It is labour intensive to build, which restricts it to racing cars and low volume specialist vehicles. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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