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Semi-monocoque structure inside an aircraft's rear fuselage
ARV Super2 with semi-monocoque fuselage

The term semi-monocoque refers to a stressed shell structure that is similar to a true monocoque, but which derives at least some of its strength from conventional reinforcement. Semi-monocoque construction is used for, among other things, aircraft fuselages, car bodies and motorcycle frames.

Examples of semi-monocoque vehicles[edit]

Semi-monocoque aircraft fuselages differ from true monocoque construction through being reinforced with longitudinal stringers.[1][2] The Mooney range of four seat aircraft, for instance, use a steel tube truss frame around the passenger compartment with monocoque behind.[citation needed]

Peter Williams' 1973 John Player Norton 750 with sheet stainless steel semi-monocoque frame, exhibited at Castletown, Isle of Man in 1999

The British ARV Super2 light aircraft has a fuselage constructed mainly of aluminium alloy, but with some fibreglass elements. The cockpit is a stiff monocoque of "Supral" alloy, but aft of the cockpit bulkhead, the ARV is conventionally built, with frames, longerons and stressed skin forming a semi-monocoque.[3]

Peter Williams' 1973 Formula 750 TT-winning JPS Norton racer was an early example of a semi-monocoque motorcycle.[4]

See also[edit]


  1. ^
  2. ^ "Archived copy". Archived from the original on 2016-03-05. Retrieved 2015-10-17.CS1 maint: archived copy as title (link)
  3. ^ "Pilot" magazine, June 1985 pages 5-6
  4. ^[permanent dead link]