Since 1936, the "Commonwealth Aircraft Corporation PTY. Ltd." has built aircraft and engines, starting with the Pratt & Whitney R-1340 Twin Wasp and Wasp.

-Subsequently they produced the Rolls-Royce "Nene" for the Australian Vampires and the "Avon" engines, also from R-R, for the Camberras and Sabres of their Air Force.

-In 1953 CAC made their own 7-cylinder radial engine: "Cicada" that gave 450 hp at 2,600 rpm.

"Cicada"

-It had a supercharger driven by multiplying gears (more than 10 rotations for every crankshaft rotation). It was intended to their own CAC training aircraft, the C-22.

"Atar-Snecma 9C"

-Later there entered a number of partners, including Rolls-Royce.

-They have produced and overhauled engines under license such as the Snecma Atar 9C, the Viper 11 Mk22 from RR/Bristol and the RR Avon Mk1, bound for the Mirage III, etc.

-Besides the Cicada, a native Australian engine, the Commonwealth Aircraft Company (CAC) made other engines under license during WWII.

-This is the case of the P&W R-1340 S1H1-G, that delivered 600 hp at 2,250 rpm with gear.

"CAC, R-1340"

-Another engine that was built under license, was the Pratt and Whitney R-1830 S1C3-G model, a 14-cylinder double-row radial that gave 1,200 hp at 2,700 rpm. It was geared and had a mechanical supercharger at 7.15:1.

"P&W, R-1830"

-The same for the Rolls-Royce Merlin 102 Model with 1,850 hp maximum military power at 3,000 rpm.

"R-R, Merlin 102"