CAC Wirraway

The CAC Wirraway is a training and general purpose military aircraft manufactured in Australia by the Commonwealth Aircraft Corporation (CAC) between 1939 and 1946. It was an Australian development of the North American NA-16 training aircraft. The Wirraway has been credited as being the foundation of Australian aircraft manufacturing.

When the name was announced on 6 April 1938, it was said to be "an Aboriginal word meaning challenge". The word presumably comes from Daniel Bunce's compilation Language of the Aborigines of the colony of Victoria, where Wirraway is glossed 'challenge; dare, to defy; incite, to stir up; menace, to threaten'.

During the Second World War, the Royal Australian Air Force (RAAF) deployed a number of Wirraways into combat roles, where they served in a light bomber/ground attack capacity, striking against the advancing forces of the Empire of Japan. While the type had been primarily used as a general purpose aircraft, being present in small quantities within the majority of front-line squadrons for these purposes, the aircraft was often pressed into combat when required. Typically, fighter versions of the Wirraway were operated over theatres such as New Guinea to perform ground attack missions and other Army co-operation tasks over extended periods until more advanced aircraft had become available in sufficient quantities. On 12 December 1942, the Wirraway achieved its only shoot-down of an enemy aircraft—thought to be a Mitsubishi A6M Zero at the time, but later determined to be a Nakajima Ki-43 Hayabusa—while flown by Pilot Officer John S. "Jack" Archer.

Following the end of the conflict, the Wirraway was operated for over a decade as a trainer by the RAAF, the newly formed RAN Fleet Air Arm, and the squadrons of the Citizen Air Force. During 1957, the last of the RAN's Wirraways was retired, having been replaced by the newer jet-powered de Havilland Vampire; as the CAC Winjeel came into squadron service, the RAAF phasing out its remaining fleet of Wirraways during the late 1950s. Officially, the last military flight to be performed by the type was conducted on 27 April 1959. Notably, the Wirraway had also functioned as the starting point for the design of a wartime "emergency fighter", which was also developed and manufactured by CAC, known as the Boomerang.

During the mid-1930s, some political leaders observed that both the Empire of Japan and Nazi Germany had the appearance of having been making strides towards a heavy preparedness for war, which in turn led to several other countries commencing their own preparations in response. However, in the case of Australia, the nation had no domestic aircraft industry, partially due to a historical preference for the procurement of both civil and military-orientated aircraft to be sourced overseas from manufacturers based in the United Kingdom, which had come about through strong political and cultural ties between the two nations. Around the same time, the Australian government decided to embark upon the development and expansion of the RAAF into a fighting force capable of defending the nation against external aggressors, in line with recommendations made by a formal evaluation compiled by Sir John Salmond in 1928. Allegedly, the move in Australia had been heavily influenced by a British decision taken in May 1935 to massively increase the front-line strength of the Royal Air Force (RAF).

However, it was recognised that, while Britain had traditionally been the main source of aircraft for Australia, comprising around 50 per cent of all operational aircraft at one point, British industry was already coming under strain to meet the demands for the RAF (a planned front line strength of 1,500 aircraft by 1930), let alone satisfying major orders from other nations. Coincidentally, figures such as the industrialist Essington Lewis had taken an interest in the development of a domestic aircraft industry within Australia. These factors cumulated in a special conference held by the Australian government at which the first plans for syndicate-operated factories to produce both aircraft and aero engines were formulated. Accordingly, during early 1936, three Royal Australian Air Force (RAAF) officers, led by Wing Commander Lawrence Wackett, were sent on an overseas evaluation mission to inspect aircraft production in Europe, Britain, and the United States, as well as to support the selection of an aircraft design for local production in Australia.

In light of the industrial circumstances, the production of cutting-edge high performance fighter aircraft, such as the Supermarine Spitfire, were viewed as being too ambitious and a potential jeopardy to the whole venture. The government's position focused on the establishment of an industrial base capable of producing aircraft; thus, it was determined that the first aircraft to be domestically manufactured should be a reliable and established general purpose aircraft, while a long-term goal of proceeding to locally produce high-performance fighters would take around five years to attain. The question of what specific aircraft should be manufactured was a more complex question, as it was quickly recognised that there was no existing aircraft in RAAF service that was attractive to pursue local production of.

On 17 October 1936, with the encouragement of the Government of Australia, three companies came together to form a joint venture, registered as the Commonwealth Aircraft Corporation (CAC), which had the initial goal of assessing the viability for developing a self-sufficient aircraft industry in the nation. Early on, CAC set about planning for the establishment of both engine and aircraft manufacturing and testing facilities at Fishermans Bend, Melbourne, Victoria, purchasing tooling and equipment from manufacturers in both Britain and the United States. The newly formed company quickly decided that it would initially pursue the development and production of a single-engine armed advanced trainer aircraft, which would likely be a licence-built version of an existing aircraft. An investigation of various European and American-sourced aircraft was conducted to judge candidate designs for suitability.