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French piston aircraft engine widely used during WW1 and the 1920s From Wikipedia, the free encyclopedia
The Renault 12Fe, or 300 CV, is a water-cooled V12 aero engine. The 12Fe was the most produced Renault aircraft engine and powered many French aircraft during World War I and the 1920s.
| Renault 12Fe | |
|---|---|
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| Renault 12Fe aero-engine. Displayed at the national air and space museum of France. | |
| Type | Water-cooled V12 aero engine |
| National origin | France |
| Manufacturer | Renault |
| First run | Late 1916 |
| Major applications | Breguet 14 Voisin X |
| Number built | >7,000 |
| Developed from | Renault 12F |
The engines were built in Renault's factories in France and the United Kingdom with additional licensed production by other French and British manufacturers.
By the end of World War I, 12Fe engines powered the bulk of the French bomber force. Post-war the engine type was selected by many of the first airlines and airmail services. During the 1920's 12Fe engines set new standards for endurance and reliability while aircraft fitted with an experimental turbocharged version of the engine claimed a series of high-altitude records.
In 1915, Renault started production of 22.08 L (1,347 cu in) water-cooled 50° V12 engines. These engines were progressively improved with the introduction of aluminium pistons allowing for increased power output and reduced weight. In 1917, the 12Fe model was homologated with a nominal rating of 300 hp (later increased to 320 hp). The 12Fe was the main production variant and accounted for the vast majority of engines built in the series.[1][2]
The 12Fe’s crankshaft is carried on four plain bearings. Master-and-slave connecting rods were used allowing corresponding cylinders in each row to be arranged directly opposite each other. Cylinders are built in pairs with water circulated in welded liners using a single impeller centrifugal pump with dual outlets.[3]
Ignition system has 100% redundancy with two spark plugs per cylinder and four magnetos (two per cylinder bank).[4]
The engine made use of valve overlap to improve cylinder scavenging. The inlet closed 6 degrees late while the exhaust closed 19 degrees late giving a 13-degree overlap.[3]
The Renault 12Fe is by far the most numerous Renault aero-engine ever produced.[1] 5,300 were built during WW1.[1][5] Production continued at a slower pace after WW1 with the total number reaching about 7,000 by the mid 1920s.[6]
In France, production of the engines took place at Renault’s Paris factories located in Boulogne-Billancourt and Vélizy-Villacoublay. In addition to Renault's own production, some engines were built under license by other French manufacturers including Bellanger and Darracq.[1]
In the United Kingdom, Renault 12Fe engines were built under license by Renault's British subsidiary and Wolseley Motors.[7]
The engine was designated as the 12Fe by the Service Technique de l'Aéronautique who treated it as a variant of the 12F series.[8] Renault marketed the engines as a distinct type which they referred to as the 300 CV (cheval-vapeur) (French: "horsepower”).[6]
The 12Fe was primarily used in bomber aircraft during World War One.[1] By the end of the war, the 12Fe had become the standard powerplant for the Breguet 14[9] and had replaced the unreliable Peugeot 8Aa on the Voisin bombers.[10] After the war the engine continued to be used by military aircraft and saw service in early airliners and mail planes.[1]
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Aircraft powered by the Renault 12Fe set numerous records for distance, endurance and reliability in the early 1920s.[11][12] The engine proved to be particularly durable. During the first half of 1923 Aéropostale aircraft powered by the 12Fe travelled a collective 663,700 km (412,400 mi) without experiencing any engine failures. In 1924, a 12Fe powered Aéropostale aircraft set a world safety record by traveling 150,000 km (93,000 mi) without experiencing any engine problems.[11]
From 1918, Renault 12Fe engines, fitted to Breguet 14 aircraft, were used to test experimental turbochargers designed by Auguste Rateau.[1][13] Aircraft fitted with turbocharged 12Fe engines went on to set altitude records in 1919,[12] 1922 and 1923.[11] Ultimately the turbocharged 12Fe engines were rejected for service by the French Airforce due to reliability concerns.[13]
The early Rateau turbochargers delivered air to the engine’s carburetor at around two times atmospheric pressure while consuming less than 30 hp (22 kW).[14] The following results were obtained in 1918 during tests on a Breguet 14 fitted with a turbocharged Renault 12Fe engine:[15]
| Test | Naturally aspirated | Turbocharged | % Gain |
|---|---|---|---|
| Speed at 6,500 m (21,300 ft) | 101 km/h (63 mph) | 113 km/h (70 mph) | 12% |
| Speed at 4,200 m (13,800 ft) | 167 km/h (104 mph) | 194 km/h (121 mph) | 16% |
| Engine revs at 4,200 m (13,800 ft) | 1,380 rpm | 1,590 rpm | 15% |
| Climb rate from 3,500–4,000 m (11,500–13,100 ft) | 2 m/s (6.6 ft/s) | 2.3 m/s (7.5 ft/s) | 15% |
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A preserved Renault 12Fe, fitted with an experimental Rateau turbocharger, is on display at the Musée de l'air et de l'espace. Another Renault 12Fe engine, installed in the nacelle of a Voisin X pusher aircraft, can be seen at the same museum.
One Renault 12Fe engine is on display at the Polish Aviation Museum in Kraków.
Data from Angle,[3] L'Aéronautique[16] and Renault.[2] Data is for a naturally aspirated 12Fe engine.
Comparable engines
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