For the next 20 years the Museum grew as more and more aircraft came into the collection and the theme of the Museum was quickly established. An aircraft or artefact acquired by the Museum had to be relevant to Australian aviation history. Without realising it the Museum was establishing what would be labelled by museum professionals years later as a collection policy. This theme is what held the Museum collection together and provided a sense of purpose to the collection. Other aviation museums would form in Australia but none would acquire the vast range of aircraft types, all of which related directly to Australian history. The collection ranges from gliders and homebuilts to World War II combat aircraft, jet fighters, crop dusters and four engine airliners.