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CAC Wackett
The CAC Wackett trainer was the first aircraft type designed in-house by the Commonwealth Aircraft Corporation of Australia. The name was derived from its designer Lawrence Wackett.
==Development==
The type was designed to meet RAAF Specification 3/38 for an ''ab initio'' training aircraft.〔 It was a tandem seat fixed tailwheel-undercarriage monoplane aircraft with a fuselage of steel tube and fabric construction and wings and tail made of wood. Despite the simplicity of the design, construction of the first of two CA-2 prototypes, begun in October 1938, was not completed until September 1939 (this was partly because CAC was still building its factory during this time period). The first prototype flew for the first time on 19 September 1939 fitted with a Gipsy Major engine.〔 The aircraft proved to be underpowered with this engine so the second prototype was fitted with a Gipsy Six prior to its first flight in early November the same year (the first prototype was subsequently also re-engined with a Gypsy Six). Although in-flight performance was improved, the heavier engine negated any benefits to take-off performance obtained from the increased power, so the decision was made to install a Warner Scarab radial engine driving a Hamilton two-bladed propeller. The two prototypes were fitted with Scarabs in mid-1940.
Several months passed before the RAAF committed to the type, partly because for a time it appeared that the organisation's training needs could be met with other types already being procured. However RAAF Specification 1/40 for the "Supply of () CAC Wackett..."〔''Tiger Moth, CT-4, Wackett & Winjeel in Australian Service'' Stewart Wilson.〕 was eventually issued in August 1940 and the Wackett entered production. The first CA-6 Wackett recorded its first flight on 6 February 1941 and entered service in March that year. Supplies of Hamilton propellers, which were being manufactured locally by de Havilland Australia, and the Scarab engines, were erratic during the first half of 1941. The propeller supply problem was not fully resolved until October of that year, so many unflyable aircraft accumulated at the CAC factory at Fisherman's Bend. However, during this time the opportunity was taken to incorporate modifications to the thickness of the lower wing skins that in-service use had shown were required. Following the outbreak of the Pacific War production was increased to make way for the Boomerang and the last Wackett was delivered to the Royal Australian Air Force on 22 April 1942.
In the 1950s several aircraft were converted by Kingsford Smith Aviation Services Pty. Ltd. as agricultural aircraft, being renamed the KS-2 or KS-3 Cropmaster. The KS-2 had a hopper installed in the front cockpit; the single conversion was not a success so it was re-modified as the KS-3 with the hopper located in the rear cockpit. Four more Wacketts were converted to KS-3s and the type was further developed as the Yeoman Cropmaster.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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