The Boarhound prototype, unsuccessful as a contender to replace the Bristol Fighter in the army cooperation role. Photo from: Bristol

The first Virginia V awaiting delivery to 58 Sqn. Photo from: Imperial War Museums

The first of three Berkeleys built to meet an RAF requirement for a day and night bomber. The Hawker Horsley emerged the winner. The three Bristols were taken on charge by the RAF for use in experiments by the Royal Aircraft Establishment at Farnborough. At least one survived until 1930. The Berkeley was the first Bristol aircraft to be built with a model number. 90 was arrived at by counting back over past designs. Photo from: Imperial War Museums

Schiphol in 1925. Six military hangars were initially constructed near the Schiphol fortress and the barracks in the bottom right corner. A tent has been pitched near the civilian hangars for an event. Many visitors will have arrived by boat at the hotel and restaurant on the canal dike, now the N232 road. New Fokker aircraft also arrived by boat from the factory in North Amsterdam, to be reassembled in the Fokker hangar, built in 1924. Photo from: KB - National Library of the Netherlands

The caption at the library says 1925 however no reference to this accident can be found. Whim Creek, which now has a population of only five, had hundreds of residents in the 1920s because of a copper mine. G-AUEL was operated by West Australian Airways service on its long Perth to Broome service which stopped at Whim Creek. Photo from: State Library of Western Australia

The first Stout AT-2, unregistered and named Maiden Dearborn (I). Photo from: Library of Congress

The lowest power category in the 1925 German Round Flight for light aircraft was up to 40 hp. Hans Klemm thought this disadvantaged his Daimler L20, which had a 20-hp Mercedes F7502 engine, and improvised the L21 with two of these. Two L21s were built, D-623 flown by Bruno Loerzer winning the rally, and D-622, flown by Friedrich Siebel during the event. The photo was probably taken in 1925. The L21 was not pursued further since it could not maintain altitude on one engine. Klemm started his own company in 1927, and his partner Siebel did the same in 1937. Location not known - perhaps Daimler airfield at Sindelfingen. Photo from: Daimler

Helicopter designed by Dutch engineer Albert Gillis von Baumhauer. A short first flight was made on 5 September 1925 and a more substantial one on 10 February 1926. The vehicle featured a tail rotor, powered by its own engine, but lacking pitch control. Slow progress was made until the helicopter crashed on 29 August 1930. By then working for the Dutch CAA, Von Baumhauer was killed in the crash of Boeing Stratoliner NX19901 on 18 March 1939. Photo from: Nederlands Instituut voor Militaire Historie

Photo taken by a Swiss geologist, apparently at Dübendorf. This trimotor was taken on charge in November 1924 by CIDNA's predecessor company, CFRNA - Compagnie Franco-Roumaine de Navigation Aérienne. It crashed near Budapest on 24 May 1928. Photo by: Paul-Louis Mercanton / ETH-Bibliothek Zürich

First flown in November 1922, the D.1 was a modern fighter built largely of metal. The fabric-covered wing was originally mounted on the fuselage but raised on the D.1bis and ter to improve the visability for the pilot. Main customers were Italy, where a smaller variant was built as the Ansaldo AC.2, Yugoslavia and the French navy. Two D.1s, including this one, were delivered to Switzerland. C1 on the tailfin is a French code for a single-engined fighter. Photo from: ETH-Bibliothek Zürich