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 CAC CA 13 Boomerang      
These images came via Matthew Denning, a restorer and owner of airworthy Boomerang A46-122 which he restored over a period of 28 years. Matt was given these photographs by a former CAC worker.
This first series of pictures are of the crash of Hep Cat, a Boomerang belonging to 4 Squadron RAAF which crashed in New Britain
A46-217 a CA-19 C/N 1040 served with 4 and 5 Sqns; was coded QE-G and had "Hep Cat" on the cowl with a painting of a cat in a stripped jumper to the rear of the words while with 4 Sqn at Morotai, Halmaheras around April 1945; swung off Cape Hoskins strip New Britain on 12/2/45 while with 5 Sqn; converted to components 08/45.
This second series comes from a Boomerang crash. A46-70 from 85 SQN which crashed on 1st Nov 1944 at Belmont WA. Flown by W/O GS Cuming who survived the crash with back injuries but recovered in Hospital.
It was a CA-12 model C/N 893.
Thanks to Matt Denning for the information. 
This is the engine which was wrenched from the fuselage. Matt commented the crushed air intake can be seen near the top on the left, moving further to the right is the carburettor, and to the right of that the magnetos.
This is an early production machine with the prototype CA4 Wackett bomber, seen in close-up in the right hand picture.
Boomerangs of an operational training unit, possibly 2 OTU.