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SNECMA 14R

Radial piston aircraft engine

Field	Value
name	SNECMA 14R
image	File:Gnome et Rhône 14R 04-05 - Musée Safran 07.jpg
engine_type	14 cylinder two-row air-cooled radial piston engine
manufacturer	Gnome-Rhône / SNECMA
national_origin	France
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 just prior to the start of World War II from the Gnome-Rhône 14N. The 14N radial engine was itself an improved version of the popular pre-war Gnome-Rhône 14K Mistral Major series; designed and manufactured by Gnome et Rhône, a major French aircraft engine manufacturer whose origins pre-date the First World War.

The improved 14R was initially known as the Gnome-Rhône 14P and then the Gnome-Rhône 14R. There were several improvements such as the introduction of a longer crankshaft and crankcase with a centre bearing, an increase in cylinder capacity, and a two-speed compressor. These changes allowed the engine to deliver 1,400hp at take-off and 1,300hp at 1,500m (1st gear) and 1200hp at 4000m (2nd gear). This came at the cost of a much increased total weight. It was expected that further development, such as the introduction of higher grade fuels, would lead to a power output of 1,660hp at low altitude.

With the Fall of France, engine development was stopped under the occupation. After the war, development recommenced; however production of this engine after 1945 was transferred to the newly formed SNECMA and the engine was renamed the SNECMA 14R.

Variants

;14R-04:Improved higher performance using 92 Octane fuel. 14N with 2-speed supercharge (6.5:1 and 9:1), LH rotation, 1590 hp for take-off. ;14R-05:RH rotation version of 14R-4. ;14R-08:RPM increased from 2,400 to 2,600 improving power output. LH rotation. ;14R-09:RH rotation version of 14R-08 ;14R-24:LH rotation, 1600 hp. ;14R-25:RH rotation version of 14R-24. ;14R-26:LH rotation, 1600 hp. ;14R-27:RH rotation version of 14R-26. ;14R-28:LH rotation, 1600 hp. ;14R-29:RH rotation version of 14R-28. ;14R-32:LH rotation ;14R-100: ;14R-200:LH rotation ;14R-201:RH rotation ;14R-210: ;28T-1:28 cylinder, double 14R-24 engines placed back-to-back with co-axial contra-rotating propeller shafts, direct fuel injection, 2-speed supercharger, 77.4 L displacement, delivering 3200 hp for take-off using 100/130 octane fuel.

Applications

Sud-Est SE.200 Amphitrite
SNCASE SE-1010
Nord Noroit - only the prototypes had the Gnome-Rhône 14R
Nord 1500 Noréclair
Nord Noratlas - only the prototype had the Gnome-Rhône 14R
SNCAC NC.211 Cormoran

Specifications (14R-04)

**Take-off:**1590 hp at 2,600 rpm at 1180 mm Hg boost with 100 octane fuel
- **Military, low:**1660 hp at 2,600 rpm at 1000 m
- **Military, high:**1580 hp at 2,600 rpm at 5500 m
- **Normal, low:**1320 hp at 2,400 rpm at 2100 m
- **Normal, high:**1230 hp at 2,400 rpm at 6000 m |power/weight= 1.494 kW/kg (0.909• hp/lb)
B.M.E.P.: 213 psi
Ignition: 2 x R.B. magnetos, 2 x 18 mm short reach spark plugs per cylinder fed by a shielded ignition harness.

References

Wilkinson, Paul H.. (1946). "Aircraft engines of the World 1946". Sir Isaac Pitman & Sons Ltd..
Wilkinson, Paul H.. (1945). "Aircraft engines of the World 1945". Sir Isaac Pitman & Sons Ltd..

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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