Béarn 6D
Type 6-cyl. inverted air-cooled inline piston aircraft engine
National origin France
Manufacturer Construction Mécanique du Béarn (CMB)

The Béarn 6 was a six-cylinder air-cooled piston aircraft engine produced in France in the late 1930s, 1940s and early 1950s.[1]

Design and development

The Béarn 6 suffered from lack of development and was not a commercial success, most production engines had been removed from service by 1950 due to poor reliability.

Variants

6C
6D
6D.07

Applications

Specifications (Béarn 6D)

Data from Aircraft Engines of the World 1946.[1]

General characteristics

  • Type: 6 cylinder, inverted, in-line, four-stroke piston engine
  • Bore: 130 mm (5.12 in)
  • Stroke: 135 mm (5.31 in)
  • Displacement: 10.7 L (653 cu in)
  • Length: 1,500 mm (59.06 in)
  • Width: 450 mm (17.72 in)
  • Height: 825 mm (32.48 in)
  • Dry weight: 290 kg (640 lb)
  • Frontal Area: 0.33 m2 (3.6 sq ft)

Components

  • Valvetrain: 2 overhead valves per cylinder, pushrod actuated.
  • Supercharger: Gear driven single-speed supercharger with 11.15:1 gear ratio.
  • Fuel system: 1x Zenith 80RGSL-05 updraught carburettor with automatic boost control
  • Fuel type: 87 octane petrol
  • Oil system: Pressure fed at 4.8 bar (70 psi), dry sump
  • Cooling system: Air-cooled
  • Reduction gear: Planetary reduction gear, 0.67:1 ratio adapted for Ratier or Chauvière variable-pitch propellers
  • Starter: Air Equipment 51020 electric inertia starter
  • Ignition: 2 x R.B. GPBA magnetos, 2 x spark plugs per cylinder fed by a shielded ignition harness.

Performance

  • Power output:
    • Take-off: 310 kW (410 hp) at 2,800rpm, 1,160 mm (46 in) / +3.6 kg (7.9 lb) boost with 100/130 octane petrol
    • Normal: 260 kW (350 hp) at 2,700rpm at 2,000 m (6,600 ft)
    • Cruising: 190 kW (260 hp) at 2,200rpm at 2,000 m (6,600 ft)
  • Specific power: 27.89 kW/L (0.63 hp/cu.in)
  • Compression ratio: 7.2:1
  • Specific fuel consumption: 0.322 kg/(kW h) (0.53 lb/(hp h))
  • Oil consumption: 0.00669 kg/(kW h)(0.011 lb/(hp h))
  • Power-to-weight ratio: 0.968 kW/kg (0.585 hp/lb)

See also

Related lists

References

  1. 1 2 Wilkinson, Paul H. (1946). Aircraft engines of the World 1946 (3rd ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 220–221.
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