Jacobs R-915

The Jacobs R-915 or Jacobs L-6 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States, production started in 1936.[1]

R-915
Type Radial engine
Manufacturer Jacobs Aircraft Engine Company
Developed from Jacobs R-755

Design and development

The R-915 was effectively an enlargement of the R-755 with strengthened stressed parts.[2] With a bore and stroke of 5.5 in × 5.5 in (140 mm × 140 mm), for a displacement of 915 cu in (15 L). Take-off power was around 330 hp (250 kW). The engine features steel cylinders with aluminum-alloy cylinder heads.

Variants
R-915A1
Baseline variant; an enlarged R-755
R-915A3
Similar to the A1 but with Scintilla magnetoes
R-915A4
With a power take-off for autogyros

Applications

Engines on display

Specifications (R-915A1)

Data from Jane's[5]

General characteristics

  • Type: 7-cylinder air-cooled radial piston engine
  • Bore: 5.5 in (140 mm)
  • Stroke: 5.5 in (140 mm)
  • Displacement: 915 cu in (15 L)
  • Length: 40 in (1,030 mm)
  • Diameter: 45.5 in (1,160 mm)
  • Dry weight: 555 lb (252 kg)

Components

  • Valvetrain: 2 valves per cylinder (pushrod-actuated); sodium cooled exhaust valves
  • Fuel system: Single Stromberg NA-R7A carburetor
  • Fuel type: 80 octane
  • Oil system: One pressure pump, two scavenge pumps
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive, right hand tractor

Performance

See also

Related development

Comparable engines

Related lists

References

Notes
  1. Gunston 1989, p.85.
  2. Wilkinson, Paul H. (1950). Aircraft engines of the World 1950 (8th ed.). London: Sir Isaac Pitman & Sons Ltd. p. 161.
  3. Nanton Lancaster Society: Jacobs L-6 MB Retrieved: 23 July 2015
  4. The Canadian Museum of Flight - L-6 Retrieved: 31 January 2009
  5. Janes 1989, p.305.

Bibliography
  • Gunston, Bill. World Encyclopedia 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, 1989. ISBN 0-517-67964-7
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