Hudson Fysh in his book on QF described setting out from Sydney in 1921. Fysh flew a BE2E and McInnes flew an Avro Dyak.
THe Avro Dyak was an Avro 504 which had been re-engined with a more reliable Dyak engine. I suppose that is the aircraft QF is seeking. It was crashed at Ingham in 1922 I think but was repaired and continued in service till....when?
I think it will be a miracle if it still exists in any form. <img src="frown.gif" border="0">