The result was the Widgeon, a wooden hull biplane flying boat powered by an Armstrong Siddeley Puma of located below and forward of the upper wing. This aircraft, the first flying boat to be wholly designed and constructed in Australia, was registered to the Civil Aviation Branch out of the Australian sequence (i.e. G-AUxx) as G-AEKB, after E. K. Bowden, Minister for Defence. The aircraft was launched on 7 July 1925 into Botany Bay. The following day it hit a sandbank during taxi tests and later overturned whilst attempting a takeoff. Wackett was on board with Brinsmead and two mechanics; all were unhurt. The aircraft was repaired and made its first flight on 3 December that year. Wackett subsequently installed a more powerful ADC Nimbus engine and an undercarriage, converting it into an amphibian. Following the modifications the Widgeon I was transferred to the RAAF and used at Point Cook for flying boat training from 1927. The aircraft operated with the RAAF until 1929, when it was scrapped. A larger amphibian, the Widgeon II, powered by a Armstrong Siddeley Jaguar engine, was the next aircraft to emerge from the Experimental Section workshop. Wackett himself flew the Widgeon II extensively, later saying, "I proved its capability by flying it on a journey across and around part of the Australian continent in 1928". The next aircraft developed at Randwick was the two-seat Warrigal I of 1929, a biplane trainer of conventional design, powered by a Armstrong Siddeley Lynx radial engine. This was followed in 1930 by the improved Warrigal II, powered by a Armstrong Siddeley Jaguar radial engine.