SNECMA 14R

SNECMA 14R
Type	14 cylinder two-row air-cooled radial piston engine
National origin	France
Manufacturer	Gnome-Rhône / SNECMA
Major applications	Breguet Br 500 Colmar
Developed from	Gnome-Rhône 14N

The SNECMA 14R was a 14 cylinder two-row air-cooled radial engine developed in France from the Gnome-Rhône 14N, initially as the Gnome-Rhône 14R, with production after 1945 as the SNECMA 14R.

Variants

14R-04

14R-05

rotates opposite direction to -04

14R-24

14R-100

14R-200

Specifications (14R-04)

Data from

General characteristics

• Type: 14 cylinder two-row air-cooled radial piston engine
• Bore: 146 mm (5.75 in)
• Stroke: 165 mm (6.50 in)
• Displacement: 38.7 L (2,361.62 cu in)
• Length: 1,635 mm (64.37 in)
• Diameter: 1,297 mm (51.06 in)
• Dry weight: 819 kg (1,805.59 lb)
• Frontal Area: 1.33 m² (14.3 sq ft)

Components

• Valvetrain: Single inlet and exhaust valves operated by rockers and pushrods
• Supercharger: Gear-driven 2-speed supercharger at 6.5:1 and 9.0:1 ratios
• Fuel system: 1x Bronzavia updraught carburettor with automatic boost and altitude control
• Fuel type: 92 Octane gasoline
• Oil system: Pressure fed at 480 kPa (70 psi)
• Cooling system: Air-cooled with baffles
• Reduction gear: Planetary / epicyclic bevel reduction gearing at 0.67:1 ratio
• Starter: Air equipment electric inertia starter
• Ignition: 2 x R.B. magnetos, 2 x 18 mm (0.71 in) short reach spark plugs per cylinder fed by a shielded ignition harness.

Performance

• Power output:
  
• Take-off:1,590 hp (1,185.66 kW) at 2,600 rpm at 1,180 mm (46.46 in) Hg boost with 100 octane fuel
  • Military, low:1,660 hp (1,237.86 kW) at 2,600 rpm at 1,000 m (3,280.84 ft)
  • Military, high:1,580 hp (1,178.21 kW) at 2,600 rpm at 5,500 m (18,044.62 ft)
  • Normal, low:1,320 hp (984.32 kW) at 2,400 rpm at 2,100 m (6,889.76 ft)
  • Normal, high:1,230 hp (917.21 kW) at 2,400 rpm at 6,000 m (19,685.04 ft)
• Specific power: 31.85 kW/l (0.7 hp/cu.in)
• Compression ratio: 6.8:1
• Specific fuel consumption: 0.292 kg/kW/hr (0.48 lb/hp/hr)
• Oil consumption: 0.0067 kg/kW/hr (0.011 lb/hp/hr)
• Power-to-weight ratio: 1.494 kW/kg (0.909• hp/lb)
• B.M.E.P.: 1,470 kPa (213 psi)
• 14R-05 propeller rotates in opposite direction