From Wikipedia, the free encyclopedia
Semi-monocoque structure inside an aircraft's rear fuselage
ARV Super2 with semi-monocoque fuselage

The term semi-monocoque or semimonocoque 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.[3]

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.[4]

Peter Williams' 1973 Formula 750 TT-winning John Player Norton racer was an early example of a semi-monocoque motorcycle.[5]

See also[edit]


  1. ^ "Definition of SEMIMONOCOQUE".
  2. ^ "Semi Monocoque, Mono-what?". Archived from the original on 2016-03-05. Retrieved 2015-10-17.
  3. ^ Mooney article [1]
  4. ^ "Pilot" magazine, June 1985 pages 5-6
  5. ^ "Peter Williams Motorcycles | Jpn Monocoque Replica". Archived from the original on 7 June 2013. Retrieved 22 May 2022.