High Quality Content by WIKIPEDIA articles! The Warrigal I and II were Australian aircraft designed by Squadron Leader Lawrence James Wackett and built by the Experimental Section of the Royal Australian Air Force (RAAF) at Randwick, New South Wales, during the late 1920s. They were both single-engined, two-seat biplanes of mixed wood and metal construction. The Warrigal I was the first aircraft designed and built in Australia to an official RAAF specification.