Entry No. 6 in the Low-Powered Aeroplane Competition. The B-4 was the best of the entries , beaten only by two DH53s which were illegible by virtue of being imported and operated by the government. B-4 designed by Harry Broadsmith who had come to Australia from the UK to set up an Avro 504 factory. He designed several aircraft during his time down under. Broadsmith used an ABC Scorpion engine in the B-4. Disenchanted with the failure to establish a local aircraft industry, Broadsmith returned to the UK and joined Saunders-Roe. Photo from: National Library of Australia

Built specifically for the competition held at Richmond. Designed by Harry Broadsmith (ex Avro) and built by Hector Ross. Ross withdrew due to illness. The Bett 1 was never registered. Photo from: State Library of Queensland

The Warbler was designed by Lawrence Wackett, a major figure in Australian aviation. It was built at the Government Experimental Aircraft Factory in Sydney, which he headed. The Warbler was powered by a 30hp 1490cc Wizard engine also designed by Wackett. The Warbler came second among the eligible entrants. What happened to it after the event is not known but it was never registered. Photo from: State Library of Queensland