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In 1941, because of a need to replace the Bristol Beaufort and Lockheed Hudson, the RAAF issued Development Specification No. 241. This stipulated an aircraft suitable for: reconnaissance, general bombing, torpedo delivery and dive bombing.
CAC, under Sir Lawrence Wackett, began to re-work an existing, unbuilt design, the CAC CA-4 (sometimes known as the Wackett, and not to be confused with the unrelated CA-6 Wackett single-engine trainer). A prototype CA-4 took to the air on September 19, 1941. The CA-4 was a low wing, twin-engined, dive bomber with a crew of three. It was armed with four nose-mounted .303 calibre machine guns and two remote-controlled twin machine-gun barbettes mounted at the rear of the engine nacelles. It could carry either 500 lb (230 kg) bombs, 250 lb (110 kg) bombs or two torpedoes. It was originally powered by two Pratt & Whitney Twin Wasp R-1830-S3C3-G radials. (The CA-4 prototype was scrapped in 1943 after it suffered major damage, from a mid-air explosion due to a fuel tank leak and a consequent fire.)
With a re-designed tail and rudder, and an improved nose armament of two 20 mm cannon and two .303 calibre machine guns, the CA-4 became the CA-11
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