semi-monocoquen.

1918 Flight 28 Feb. 224/2 This semi-monocoque structure would retain its strength even after damaging some of the longitudinal members.

1931 Warner & Johnston Aviation Handbk. 653 The semimonocoque has the skin reinforced by longerons and vertical bulkheads but has no diagonal web members.

1931 Warner & Johnston Aviation Handbk. 653 For the semimonocoque type the verticals should be designed as for the true monocoque designs.

1948 C. E. Chapel Aircraft Basic Sci. ii. 84/2 Monocoques may be divided into three classes (monocoque, semimonocoque, and reinforced shell), and different portions of the fuselage may belong to any of these classes. The true monocoque has as its only reinforcement vertical bulkheads formed of structural members... All stresses are carried by the shell or skin.

1960 C. H. Gibbs-Smith Aeroplane xii. 93 As many of the so-called ‘monocoque’ structures came to include internal stiffening members—the skin bearing most but not all of the loads—the term ‘stressed-skin’ is better, implying a ‘semi~monocoque’ rather than a wholly unaided ‘shell’ structure.

1980 R. C. Mikesh Albatros D.Va i. 13 Their semi~monocoque, smoothly contoured plywood fuselage was a radical change from the boxy, fabric-covered structures then in general use.

1966 Publ. Amer. Dial. Soc. 1964 xlii. 8 Semi~monocoque, adj., applied to a chassis which combines constructions of both monocoque and space frame, such as that of the Jaguar.

1973 C. Campbell Design Racing Sports Cars viii. 134 The Formula 1 solution is usually called ‘semi-monocoque’ since the typical design has a centre section that is more like a bath-tub than an egg.