The Winjeel (from a Victorian indigenous word for "young eagle",[1] an alternate spelling of Bunjil) was developed by the Commonwealth Aircraft Corporation at Fishermans Bend in Victoria to satisfy RAAF technical requirement No.AC.77 issued in 1948.

[2][3] However, it proved a very stable aircraft making it almost impossible to spin, and with this being a required part of pilot training the tail had to be redesigned as a result.

[2] For most of its service life, the Winjeel was used as a basic trainer at RAAF Base Point Cook in Victoria, after 1 BFTS was transferred there in 1958.

[2] The failure of this concept ultimately ensured that the Winjeel was retained in the training role until 1975,[4] when it was replaced by the New Zealand-built PAC CT/4A Airtrainer.

[3] Source:[6] Airworthy Static (on display unless otherwise noted) Data from Jane's All The World's Aircraft 1955–56[7]General characteristics Performance