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Taken together, the layout decisions in an airframe are governed principally by

  • A.Making every member as thick as possible
  • B.Using a single material throughout
  • C.Minimising the number of ribs and frames
  • D.Tracing each load to where it is reacted

Answer: D

Airframe layout is the discipline of load paths: wherever a concentrated load enters a thin shell, a fitting or a heavy frame appears to spread it, and wherever a path is interrupted, weight follows. Everything else, material choice included, is subordinate to getting those paths right.

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