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Béarn 6

Béarn 6

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
Type6-cyl. inverted air-cooled inline piston aircraft engine
National originFrance
ManufacturerConstruction 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.

Variants

6C6D6D.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, air-cooled, inverted, in-line, geared, super-charged, 4-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 (639.3 lb)

  • Frontal Area: 0.33 m2 (3.6 sq ft)

Components

  • Valvetrain: 2 overhead valves per cylinder, pushrod actuated.

  • Supercharger: Gear driven 1-speed supercharger at 11.15:1 gear ratio.

  • Fuel system: 1x Zenith 80RGSL-05 updraught carburettor with automatic boost control

  • Fuel type: 87 Octane gasoline

  • Oil system: Pressure fed at 482.6 kPa (70 psi), dry sump

  • Cooling system: Air baffled

  • 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:**305.74 kW (410 hp) at 2,800rpm, 1,160 mm (45.67 in) / +3.58 kg (7.9 lb) boost with 100/130 octane gasoline

  • **Normal:**260.99 kW (350 hp) at 2,700rpm at 2,000 m (6,561.68 ft)

  • **Cruising:**193.88 kW (260 hp) at 2,200rpm at 2,000 m (6,561.68 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

[1]
Citation Linkopenlibrary.orgWilkinson, Paul H. (1946). Aircraft engines of the World 1946 (3rd ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 220–221.
Sep 26, 2019, 4:37 AM
[2]
Citation Linken.wikipedia.orgThe original version of this page is from Wikipedia, you can edit the page right here on Everipedia.Text is available under the Creative Commons Attribution-ShareAlike License.Additional terms may apply.See everipedia.org/everipedia-termsfor further details.Images/media credited individually (click the icon for details).
Sep 26, 2019, 4:37 AM