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The Monosoupape (French for single-valve), was a rotary engine design first introduced in 1913 by Gnome Engine Company (renamed Gnome et Rhône in 1915). It used a clever arrangement of internal transfer ports and a single pushrod-operated exhaust valve to replace the many moving parts found on more conventional rotary engines, and made the Monosoupape engines some of the most reliable of the era.
The later 160 hp nine-cylinder Gnome 9N rotary engine used the Monosoupape valve design while adding the safety factor of a dual ignition system, and was the last known rotary engine design to use such a cylinder head valving format.
In 1915 around 45% of all Le Rhône engines manufactured in France were exported to Great Britain, Italy and Russia. Le Rhône series engines proved to be far more popular with aircraft manufacturers than Gnome et Rhône's other major engine series, the Gnome Monosoupape mainly due to the Rhône’s lower fuel and lube oil consumption. [2]
Gnome Monosoupape; O. Gnome Omega; S. Gnome Sigma This page was last edited on 20 March 2023, at 18:09 (UTC). Text is available under the Creative Commons ...
Data from General characteristics Crew: 1 Length: 7.30 m (23 ft 11 in) Wingspan: 13.90 m (45 ft 7 in) Wing area: 30 m 2 (320 sq ft) Empty weight: 350 kg (772 lb) Gross weight: 625 kg (1,378 lb) Powerplant: 1 × Gnome Monosoupape 9 Type B 9-cylinder air-cooled rotary piston engine, 60 kW (80 hp) Propellers: 2-bladed fixed-pitch propeller Performance Maximum speed: 100 km/h (62 mph, 54 kn) Time ...
The basic Gnome design was then delivered in a series of larger engines. The Gnome Lambda of 1911 was a larger 80 hp (60 kW) version of the Omega, followed by the 9-cylinder 100 hp (75 kW) Gnome Delta in 1914 (also called the Gnome Monosoupape as it used that type of engine design for the first time). Gnome also tried a 14-cylinder two-row ...
The Avro 504 is a single-engine biplane bomber made by the Avro aircraft company and under licence by others. Production during World War I totalled 8,970 and continued for almost 20 years, [2] making it the most-produced aircraft of any kind that served in any military capacity during the First World War.
A single 100 hp (75 kW) Gnome 9 "Type B2" Monosoupape rotary engine driving a four-bladed propeller powered the aircraft, [3] with the capability of taking the lower-powered Le Rhône 9C 80 hp (60 kW) nine-cylinder rotary. Its first flight was made on 15 October 1915 and the test pilot was satisfied with the aircraft's handling.