The Pobjoy R is a British seven-cylinder air-cooled radial aircraft engine designed and built by

Pobjoy Airmotors Pobjoy Airmotors and Aircraft was a England, British manufacturer of small aircraft engines. The company was purchased by Short Brothers shortly before the start of World War II, production continuing until the end of the war. History Douglas P ...

. Introduced in 1926, it was a popular engine for ultralight and small aircraft in the 1930s. A notable feature of the Pobjoy R was the propeller reduction gear which allowed the small engine to operate at more desirable higher speeds. The engine was license produced in Czechoslovakia by

Walter Aircraft Engines Walter Aircraft Engines is an aircraft engine manufacturer and former automotive manufacturer. Its notable products include the M601 turboprop. The company is based in Prague, Czech Republic. It has been a subsidiary of GE Aerospace since Jul ...

as the Walter Mira.''Letecvi'' magazine, (Walter engine range advertisement, 1935) 1934, Volume 10, No. 12
Retrieved: 27 November 2021

Variants

;Walter Mira R :License produced version of Pobjoy R. ;Walter Mira I-R :Renaming of Mira R. ;Walter Mira II-R :Developed version of the Mira R producing 95 hp (70 kW).

Applications

;Walter Mira *

Letov Š-39 __NOTOC__ The Letov Š-39 was a sport aircraft produced in Czechoslovakia during the 1930s. It was a conventional, parasol-wing monoplane with fixed tailskid undercarriage, and seating for the pilot and passenger in tandem, open cockpits. Becaus ...

* Letov Š-139

Engines on display

A preserved Pobjoy R engine is on display at the

Shuttleworth Collection The Shuttleworth Collection is a working aviation, automotive and agricultural collection located at Old Warden Aerodrome in Bedfordshire, England. History The collection was founded in 1928 by aviator Richard Ormonde Shuttleworth. While ...

Old Warden Old Warden is a village and civil parishes in England, civil parish in the Central Bedfordshire district of the county of Bedfordshire, England, about south-east of the county town of Bedford. The 2011 census shows its population as 328. The ...

Bedfordshire Bedfordshire (; abbreviated ''Beds'') is a Ceremonial County, ceremonial county in the East of England. It is bordered by Northamptonshire to the north, Cambridgeshire to the north-east, Hertfordshire to the south and the south-east, and Buckin ...

. Two Pobjoy R engines, one installed in the remains of

Comper Swift The Comper C.L.A.7 Swift is a British single-seat sporting aircraft designed and produced by the Comper Aircraft Company. It was the company’s first aircraft. The Swift was designed shortly after Nicholas Comper’s departure from the Royal A ...

(R222 / LV-FBA) will be soon on display at the National Aviation Museum in

Buenos Aires Province Buenos Aires, officially the Buenos Aires Province, is the largest and most populous Provinces of Argentina, Argentine province. It takes its name from the city of Buenos Aires, the capital of the country, which used to be part of the province an ...

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

Specifications (Pobjoy R)

References

Notes

Bibliography

* Guttery, T.E. ''The Shuttleworth Collection''. London: Wm. Carling & Co, 1969. SBN 901319-01-5 * Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. . {{Walter aeroengines R 1920s aircraft piston engines Aircraft air-cooled radial piston engines