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The CAC Boomerang was an Australian light single-seat fighter. This single-engine monoplane was based heavily on the CAC Wirraway trainer but was armed with two 20mm cannons and four 0.303 inch machine guns. The aircraft had solid handling qualities at low altitudes, but a mediocre performance at height and a poor top speed. After the first batch of Boomerang Mk I aircraft (also known as CA-12s) was completed, a CA-13 or Mk II modification was released which incorporated some minor changes: to improve the handling of the rudders and ailerons the fabric in their construction was replaced with duralumin and a larger tailfin and rudder was developed. In addition, the wings were sheathed with plywood instead of duralumin, and the wing tips were replaced with wooden ones. The shape of the exhaust pipe was changed to the characteristic Beaufort shape. A new propeller and geared cooling fan were also fitted to boost performance, although the planned supercharger was dropped from production models due to component priority being given to Spitfires and Mustangs. Still, the Boomerang Mk II’s performance was noticeably superior to that of the Mk I. 95 CA-13 Boomerang Mk.IIs were produced, with a further 49 CA-19s being manufactured with various minor modifications.