COMMONWEALTH WOOMERA - Twin-engined three-seat bomber designed to RAAF Development Specification 2/11 under direction of L J Wackett. Design work initiated April 1940 and single CA-4 prototype (A23-1001) flown at Fishermen's Bend on September 19, 1941. Powered by two 1,200 hp Pratt & Whitney R-1830-S3C4-G radial engines, CA-4 was armed with four 0.303-in (7.7-mm) machine-guns in the nose, two each in remotely-controlled barbettes at rear of nacelles above the wings, and single similar gun in ventral position. Provision for four 250-lb (113-kg) bombs in bays in nacelles and up to 4,000 Ib (1,815 kg) on three external fuselage stations, or two Mk XII torpedoes. CA-4 lost on test flight on January 15, 1943, by which time production order placed (early 1942) for 105 developed CA-11 version. First (and only) CA-11 (A23-1) completed mid-1944, first flown July 7, 1944, with nose armament of two 20-mm cannon and two 0.303-in (7.7-mm) Brownings. Programme cancelled September 1944 when next six aircraft in final assembly stage.

Data for CA-11: Max speed, 282 mph (454 km/h). Rate of climb, 2,090 ftlmin (10.62 m/sec). Service ceiling, 23,500 ft (7,168 m). Max range, 2,225 mis (3,580 km) with one torpedo. Empty weight, 12,756 Ib (5,791 kg). Gross weight, 22,885 Ib (10,390 kg). Span, 59 ft 1 in (18.02 m). Length, 39 ft 6% in (12.06 m). Wing area, 440 sqft (40.88 m2).