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Jacobs R 915

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

Contents

Design and development

The R-915 was effectively an enlargement of the R-755 with strengthened stressed parts. With a bore and stroke of 5.5 in × 5.5 in (140 mm × 140 mm) the displacement was 914 cu in (15 L), takeoff power was around 330 hp (246 kW). The engine features steel cylinders with aluminum-alloy cylinder heads. The R-915A4 variant features a drive shaft for autogyro use.

Applications

  • Avro Anson Mk II and Mk III
  • Beechcraft Model 18D
  • Beechcraft F-17D Staggerwing
  • Fleet 50
  • Howard DGA-15J
  • Kellett KD-1
  • Waco AQC, AGC, ARE, AVN

    • Engines on display

  • A preserved Jacobs R-915 is on display at the Nanton Lancaster Society.
  • A Jacobs L-6 is on display at the Canadian Museum of Flight

    • Specifications (R-915A1)

    Data from Jane's

    General characteristics

  • Type: 7-cylinder air-cooled radial piston engine
  • Bore: 5.5 in (140 mm)
  • Stroke: 5.5 in (140 mm)
  • Displacement: 914 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: 73 octane
  • Oil system: One pressure pump, two scavenge pumps
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive, right hand tractor

    • Performance

  • Power output: 330 hp (246 kW) at 2,200 RPM at sea level
  • Specific power: 0.36 hp/cu-in (16.4 kW/L)
  • Compression ratio: 6:1
  • Power-to-weight ratio: 0.6 hp/lb (1 kW/kg)

    • References

    Jacobs R-915 Wikipedia
    (Text) CC BY-SA


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