Design of Derringer fast 2-seater (2 x 160-hp) started at Hi-Shear factory June 1960, aircraft flying 1 May 1962. Wing Aircraft Co. formed 27 June 1968, still at Torrance (LA) but severed from Hi-Shear parent. Four aircraft used for certification (20 December 1966), but planned production at Coffeyville, Kansas, never funded.