Continental R-670

R-670
An R-670 fitted to a Boeing Stearman at the Imperial War Museum Duxford
Type	Piston aircraft engine
Manufacturer	Continental Motors
First run	1934
Major applications	PT-17 Stearman

The Continental R-670 (factory designation W-670) was a seven cylinder 4-cycle radial aircraft engine produced by Continental displacing 668 cubic inches and a dry weight of 465 lb (211 kg). Horsepower varied from 210 to 240 at 2200 rpm. This engine was used on many airplanes in the 1930s and 1940s. The R-670 was widely used in the PT-17 Stearman primary training aircraft of the U.S. military.^[1]

In addition to being used in aircraft, the R-670 was used in a number of light armored vehicles of World War II.

Applications

• American Airmotive NA-75
• Boeing Stearman
• CallAir Model A
• Cessna 190
• Fairchild PT-23
• G class blimp
• M1 Combat Car
• M2 Light Tank
• M3 Stuart
• LVT-4 Water Buffalo
• Timm N2T Tutor
• Waco 240-A
• Waco UEC and UIC
• Waco VKS-7
• Waco QCF-2

Specifications (R-670-K)

Data from Jane's^[2]

General characteristics

• Type: Seven cylinder air-cooled radial
• Bore: 5 ¹⁄₈ in (130.2mm)
• Stroke: 4 ⁵⁄₈ in (117.5mm)
• Displacement: 668 cu in (10.94 L)
• Length: 31.2 in (792mm)
• Diameter: 42.50 in (1,079.5mm)
• Dry weight: 460 lbs (209 kg)

Components

• Valvetrain: 1 inlet and 1 exhaust valve per cylinder
• Fuel system: 1 Stromberg Carburetor
• Fuel type: 65 octane
• Cooling system: air

Performance

• Power output: 225 hp at 2,175 rpm
• Compression ratio: 5.4:1
• Power-to-weight ratio: 0.49 hp/lb at cruise speed

See also

Comparable engines

• Lycoming R-680
  

Related lists

• List of aircraft engines
  

References

Notes

1. ^ Gunston 1989, p.42.
2. ^ Jane's 1998, p.304

Bibliography

• Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
• Jane's Fighting Aircraft of World War II. London. Studio Editions Ltd, 1998. ISBN 0-517-67964-7

External links

• http://www.oldengine.org/members/diesel/Duxford/usaero1.htm