The Miles M.13 Hobby was a small low-winged monoplane built for racing and research in the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and North ...

just before

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

. A single engined single seater, it ended its days in the wind tunnel at the R.A.E.

Design and development

The Hobby, named like many other aircraft designed by F. G. Miles after a bird of prey, was a small low winged cantilever monoplane powered by an inverted, inline 145 hp (108 kW) de Havilland Gipsy Major 2 engine driving a two-blade variable-pitch propeller. It was intended both as a racer and as an aerodynamic research aircraft. It was a wooden aircraft with spruce frames for both fuselage and flying surfaces with a birch plywood skin and a final cover of doped fabric. It was unusual, particularly for a monoplane, in having a span less than its length. The rudder alone was horn balanced. The pilot's cockpit, placed at the wing trailing edge was enclosed and neatly glazed for its day with a single piece Perspex windscreen and separate cover. The Hobby was fitted with flaps and a retractable undercarriage, both hydraulically operated. The main undercarriage legs were mounted almost at mid-span, giving the Hobby a wide track, and when retracted the wheels were completely enclosed by a combination of fairings on the undercarriage legs and separate fairing which filled in the remaining semicircular gap. It had a tailskid at the rear. Hobby threequarter

Civil Aviation Authority A civil aviation authority (CAA) is a national or supranational statutory authority that oversees the regulation of civil aviation, including the maintenance of an aircraft register. Role Due to the inherent dangers in the use of flight vehicles, ...

(CAA) documentsCAA registration
/ref> show it to have been registered (as ''G-AFAW'') on 26 April 1937, but it seems it not to have flown until early September, piloted by F.G Miles at

Woodley Aerodrome Woodley is a town and civil parish in the Borough of Wokingham, Berkshire, England, east of Reading and joined to the neighbouring town of Earley, to the west, and from Wokingham. Nearby are the villages of Sonning, Twyford, Winnersh, Hurs ...

. That was only a few days before the 1937 Kings Cup air race for which it had been entered. Unfortunately, troubles with the novel undercarriage retraction mechanism prevented its completion in time to fly in the eliminating races, held on 10 September. It was able to give a demonstration at Hatfield the following day, when the Kings Cup final was held. Despite this disappointment, the Hobby was used for experimental flying by Miles until the following Spring. It was deregistered in April 1938 but then sold to the RAE for wind tunnel testing, the small span enabling it to fit inside. It was then possible to compare measurements made in the tunnel with those from free flight conditions. Hobby front

Specifications

References

Notes

Bibliography

* * {{Miles aircraft 1930s British sport aircraft Hobby Single-engined tractor aircraft Low-wing aircraft Aircraft first flown in 1937