The Béarn 6 was a six cylinder air-cooled piston aircraft engine produced in France in the late 1930s, 1940s and early 1950s.
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.
6C6D6D-07Dassault MD-303Nord 2101 NorazurDewoitine HD.731SFCA Lignel 16S.C.A.N. 20SNCASO SO.90SNCASE SE-700AS.N.C.A.C. NC.420Data from Aircraft Engines of the World 1946
Type: 6 cylinder, air-cooled, inverted, in-line, geared, super-charged, 4-stroke piston engineBore: 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)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 controlFuel type: 87 Octane gasolineOil system: Pressure fed at 482.6 kPa (70 psi), dry sumpCooling system: Air baffledReduction gear: Planetary reduction gear, 0.67:1 ratio adapted for Ratier or Chauvière variable-pitch propellersStarter: Air Equipment 51020 electric inertia starterIgnition: 2 x R.B. GPBA magnetos, 2 x spark plugs per cylinder fed by a shielded ignition harness.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 gasolineNormal: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: 7.2:1Specific fuel consumption: 0.322 kg/kW/hr (0.53 lb/hp/hr)Oil consumption: 0.00669 kg/kW/hr (0.011 lb/hp/hr)Power-to-weight ratio: 0.968 kW/kg (0.585 hp/lb)