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Monocoque

Monocoque

  • Monocoque construction uses stressed skin to support almost all loads much like an aluminum beverage can.
  •  Although very strong, monocoque construction is not highly tolerant to deformation of the surface.
  •  For For example, an aluminum beverage can support considerable forces at the ends of
  • the can, but if the side of the can is deformed slightly while supporting a load, it collapses easily.
  • Because most twisting and bending stresses are carried by the external skin rather than by an open framework, the need for internal bracing was eliminated or reduced, saving weight and maximizing space.
  • One of the notable and innovative
  • methods for using monocoque construction was employed by Jack Northrop. In 1918, he devised a new way to construct a monocoque fuselage used for the Lockheed S-1 Racer.
  • The technique utilized two molded plywood half-shells that were glued together around wooden hoops or stringers.
  • To construct the half shells, rather than gluing many strips of plywood over a form or stripa, three large sets of spruce strips were soaked with glue and laid in a semi-circular concrete mold
  • that looked like a bathtub.
  •  Then, under a tightly clamped lid, a rubber balloon was infl ated in the cavity to press the plywood against the mold.
  •  Twenty-four hours later, the smooth halfshell was ready to be joined to another to create the fuselage or peak roofing.
  • The two halves were each less than a quarter inch thick.
  • Although employed in the early aviation period, monocoque construction would not reemerge for several decades due to the complexities involved.
  • Every day examples of monocoque construction can be found in automobile ,  honda automobiles manufacturing where the unibody is considered standard in manufacturing.

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