Details of the designer / builder are sketchy; his name was Eric Adney, he was an accountant/bookkeeper with no flying experience or engineering training.
It took around two years to build, which makes it a very early example of an Australian powered rotary wing flying machine.
It appears that the whole machine has been made with just a drill and hacksaw and maybe a vice). The aluminium tube and sheet appears to be of aircraft quality, probably obtained from war surplus aircraft, which were wrecked in thousands after WWII.
Another feature demonstrating how advanced the design was the inclusion of a "one-way" clutch to disengage the engine from the rotor(s) in the event of an engine failure. It appears to have been made from automotive ignition distributor bob-weights!
http://www.redbackaviation.com/articles/historical/early-australian-experimental-helicopter-2
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