Lorraine 14A Antarès

TheLorraine 14A Antarèswas a French 14-cylinder radialaero enginebuilt and used in the 1930s. It was rated in the 370 kW (500 hp) range.

14A Antarès
14E
Type	14-cylinder air-cooled radialaircraft engine
National origin	France
Manufacturer	Société Lorraine,Argenteuil,Paris
Variants	Lorraine Sirius

Design and development

The Antarès was a conventionally laid outradial engine,with 14 cylinders in two rows. Thecrankcasewas a barrel-shaped aluminium alloy casting, with an internal integral diaphragm which held the front crankshaft bearing. Forward of the diaphragm there was an integrally castcam-gearcase for the double trackcam-rings.The reduction gear was housed under a domed casing attached to the front of the crankcase.

Flange-mounted steel barrels were bolted to the crankcase and enclosed with cast aluminium alloy, screwed-on, cylinder heads with integralcooling fins.The pistons were also made of aluminium alloy and had floatinggudgeon pins.The fourteen pistons drove the double throw crankshaft via two channel-sectionmaster rodsand twelve circular section auxiliary rods. The master rod had an integral, split typebig-end.The crankshaft was machined from a single forging, with bolt-on balance weights.

The Antarès had a single pair ofoverheadinlet and exhaust valves per cylinder. The cam-rings drove rollertappets,mounted in the cam-case, which in turn operatedrocker arms,fitted with ball bearings, viapushrods.The cam-rings were concentric with the crankshaft and driven viaepicyclic gears.Most Antarès were conventionally aspirated via a singlecarburettor.

Variants

14A

14Ac

14E

14L

Specifications

Data fromSociete Generale Aeronautique

General characteristics

• Type:14-cylinder two-row radial piston engine
• Bore:140 mm (5.51 in)
• Stroke:150 mm (5.91 in)
• Displacement:32.326 L (1,972.7 cu in)
• Length:1,424 mm (56.06 in) - direct drive, 1,552 mm (61.10 in) - reduction gear
• Diameter:1,240 mm (48.82 in)
• Dry weight:complete 448 kg (988 lb) - direct drive, 487 kg (1,074 lb) - reduction gear

Components

• Valvetrain:one inlet and one exhaust overhead valve per cylinder, operated with rocker arms, pushrod driven via roller tappets bearing on a double track cam-ring
• Fuel system:dual 75 mm (2.95 in) Zenith carburettors
• Fuel type:petrol
• Cooling system:air-cooled
• Reduction gear:0.647:1

Performance

• Power output:370 kW (500 hp) at 1900 rpm
• Compression ratio:5:1
• Specific fuel consumption:0.311 kg/kW/hr (0.511 lb/hp/hr)
• Oil consumption:0.016 kg/kW/hr (0.026 lb/hp/hr)

References

• Revue de la Societe Generale Aeronautique(PDF)(in French). Paris: Societe Generale Aeronautique. November 1932. pp. 28–30.Retrieved12 October2014.