Kalpana Kalpana (Editor)

Jacobs R 830

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit

The Jacobs R-830 or L-5 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States, production started in 1935.

Contents

Design and development

The R-830 was effectively an enlargement of the R-755 with strengthened stressed parts. With a bore and stroke of 5.0 in × 5.5 in (140 mm × 127 mm) the displacement was 831 cu in (13.6 L), takeoff power was around 285 hp (212 kW). The engine features steel cylinders with aluminum-alloy cylinder heads.

Applications

  • Beechcraft Model 18
  • Beechcraft Staggerwing
  • Fleet 50
  • Fleetwings Sea Bird
  • Howard DGA-8
  • Waco S Series

    • Specifications (L-5)

    Data from FAA TCDS

    General characteristics

  • Type: 7-cylinder air-cooled radial piston engine
  • Bore: 5.5 in (140 mm)
  • Stroke: 5.0 in (127 mm)
  • Displacement: 831 cu in (13.6 L)
  • Dry weight: 515 lb (234 kg)

    • Components

  • Valvetrain: 2 valves per cylinder, pushrod-actuated, Sodium cooled exhaust valves
  • Fuel system: Stromberg NA-R7A carburetor
  • Fuel type: 73 octane
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive, right hand tractor

    • Performance

  • Power output: 285 hp (212 kW) at 2,000 rpm at sea level
  • Compression ratio: 6:1
  • Power-to-weight ratio: 0.55 hp/lb (0.9 kW/kg)

    • References

    Jacobs R-830 Wikipedia
    (Text) CC BY-SA