|The Miles M.28 Mercury 6 at Wolverhampton (Pendeford) Airport in May 1951. This aircraft later went to Denmark.|
|Role||Trainer & communications aircraft|
|Manufacturer||Phillips & Powis|
|First flight||11 July 1941|
|Status||one remains operational|
|Primary user||private pilot owners|
The Miles M.28 Mercury was a British aircraft designed to meet the need for a training and communications plane during the Second World War. It was a single-engined monoplane of wooden construction with a twin tail and a tailwheel undercarriage with retractable main units.
In 1941, the project was revived in response to a requirement for a training and communications aircraft. The design was produced as a private venture by Ray Bournon using Miles' normal wooden construction. The resulting machine introduced several features not found on trainers: retractable undercarriage and trailing edge flaps amongst others. In the communications role, the M.28 had four seats and a range of 500 miles (800 km).
The prototype first flew on 11 July 1941  and proved easy to fly, with light controls and a short landing run. Owing to Miles' heavy commitment to war-production, however, only six aircraft were built, of slightly varying specifications, the last being the Mercury 6 which first flew in early 1946. Examples of the type were operated in the United Kingdom, Denmark, Germany, Switzerland and Australia.
- M.28 Mark I: First prototype – Two seat trainer, powered by 130 hp (97 kW) de Havilland Gipsy Major I engine.
- M.28 Mark II: Three seat trainer (with dual controls) powered by 140 hp (100 kW) de Havilland Gipsy Major IIA. One built 1942. Re-engined with 140 hp Blackburn Cirrus Major II and then with a 150 hp (110 kW) Cirrus Major III post-war.
- M.28 Mark III: Three seat trainer with triple controls for two students and one instructor, powered by 150 hp Cirrus Major 3 and with revised wing section. One built (PW937).
- M.28 Mark IV: Four seat communications aircraft powered by 145 hp (108 kW) Gipsy Major IIA. One built 1944.
- M.28 Mark V: Post-war four-seater powered by Cirrus Major III. Square rear windows. One built 1947.
- M.28 Mark VI: Post war four-seater powered by Cirrus Major III. Round rear windows. One built 1946.
Data from The Hamlyn Concise Guide to British Aircraft of World War II
- Crew: one
- Capacity: two or three passengers
- Length: 24 ft (7.32 m)
- Wingspan: 30 ft 8 in (9.35 m)
- Height: 8 ft 4 in (2.54 m)
- Wing area: 162 ft² (15.1 m²)
- Empty weight: 1,658 lb (752 kg)
- Max. takeoff weight: 2,500 lb (1,134 kg)
- Powerplant: 1 × Blackburn Cirrus Major III inline, 150 hp (112 kW)
- Maximum speed: 138 knots (159 mph, 256 km/h)
- Cruise speed: 132 knots (152 mph, 245 km/h)
- Range: 355 NM (408 mi, 657 km)
- Aircraft of comparable role, configuration and era
|Wikimedia Commons has media related to Miles Mercury.|
- Mondey 2002, p. 172.
- Jackson, 1974, p.271
- Jerram Aeroplane Monthly September 1986, p. 474.
- Jerram Aeroplane Monthly September 1986, pp. 475–476.
- Jerram Aeroplane Monthly September 1986, p. 475.
- Mason 2010, p. 251.
- Jerram Aeroplane Monthly September 1986, p. 476.
- Jerram Aeroplane Monthly September 1986, p. 477.
- Amos, Peter. and Brown, Don Lambert. Miles Aircraft Since 1925, Volume 1. London: Putnam Aeronautical, 2000. ISBN 0-85177-787-2.
- Brown, Don Lambert. Miles Aircraft Since 1925. London: Putnam & Company Ltd., 1970. ISBN 0-370-00127-3.
- Jackson, A.J. British Civil Aircraft since 1919 - Volume 3. 1974. Putnam & Company Ltd. ISBN 0-370-10014-X.
- Jerram, Mike. "For Business And Pleasure—No. 3", Aeroplane Monthly, Vol. 14, No. 9, September 1986. pp. 474–477. ISSN 0143-7240.
- Mason, Tim. The Secret Years: Flight Testing at Boscombe Down, 1939-1945. Crowborough, UK: Hikoki Publications, 2010. ISBN 978-1-9021-0914-5.
- Mondey, David. The Hamlyn Concise Guide to British Aircraft of World War II. London: Chancellor Press, 2002. ISBN 1-85152-668-4.