- Source: Pobjoy R
The Pobjoy R is a British seven-cylinder air-cooled radial aircraft engine designed and built by Pobjoy Airmotors. 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 as the Walter Mira.
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
Letov Š-139
Engines on display
A preserved Pobjoy R engine is on display at the Shuttleworth Collection, Old Warden, Bedfordshire.
Two Pobjoy R engines, one installed in the remains of Comper Swift (R222 / LV-FBA) will be soon on display at the National Aviation Museum in Buenos Aires Province, Argentina.
Specifications (Pobjoy R)
Data from Lumsden.
= General characteristics
=Type: 7-cylinder air-cooled, radial, left-hand tractor
Bore: 3.03 in (77 mm)
Stroke: 3.43 in (87 mm)
Displacement: 173.05 cu in (2.84 L)
Diameter: 25.5 in (647.7 mm)
Dry weight: 135 lb
= Components
=Oil system: Dry sump
Cooling system: Air-cooled
= Performance
=Power output: 85 hp
Specific power: 0.5 hp/cu in
Fuel consumption: 4.9 imp. gallons per hour
Power-to-weight ratio: 0.63 hp/lb
See also
Related development
Pobjoy Niagara
Comparable engines
Rotec R2800
Related lists
List of aircraft engines
References
= Notes
== Bibliography
=Kata Kunci Pencarian:
- Pobjoy R
- Pobjoy Airmotors
- Pobjoy P
- Pobjoy Niagara
- Lippisch Delta IV
- List of aircraft (N)
- List of aircraft engines
- Couzinet 100
- Walter Aircraft Engines
- General Aircraft Monospar
