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

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

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.^{[citation needed]}

Variants

6C

6D

6D.07

Applications

• Dassault MD-303
• Nord 2101 Norazur
• Dewoitine HD.731
• SFCA Lignel 16
• S.C.A.N. 20
• SNCASO SO.90
• SNCASE SE-700A
• S.N.C.A.C. NC.420

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

• List of aircraft engines

References

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