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Scale RC Engines

WW1 Gnome 9N Monosoupape/ Oberursel Radial Engine (Half Cylinder)

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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. British aircraft designer Thomas Sopwith described the Monosoupape as "one of the greatest single advances in aviation".[1]

Produced under license in both seven and nine-cylinder versions in large numbers in most industrialized countries including Germany (by Oberursel), Russia, Italy, Britain and the US. Two differing nine-cylinder versions were produced, the 100 hp (75 kW) 9B-2 and 160 hp (120 kW) 9N, with differing displacements giving the larger displacement 9N version a nearly-cylindrical shaped crankcase, with the 9N also adopting a dual ignition system for increased flight safety.

2,188 units were produced under license in Britain, with an uprated 120 hp (89 kW) version later built in Russia and the Soviet Union, two of which flew the Soviet TsAGI-1EA single lift-rotor helicopter in 1931–32.

Commonly Found in Aircraft Such As:

  • Avro 504
  • Avro 511
  • Bristol-Coanda G.B.75
  • Sopwith Pup
  • Avro 504
  • Airco DH.2
  • Airco DH.5
  • Blackburn Scout
  • Blackburn Twin Blackburn
  • Blackburn Triplane
  • Bristol-Coanda T.B.8
  • Bristol Scout
  • FBA Type B Flying boat
  • Nieuport IV
  • Royal Aircraft Factory B.E.8
  • Royal Aircraft Factory F.E.8
  • Short S.80
  • Short Type C
  • Sopwith Sociable
  • Sopwith Type 807 Folder Seaplane
  • Sopwith Two-Seat Scout
  • Sopwith Schneider
  • Sopwith Pup
  • Sopwith F.1 Camel
  • Vickers Gunbus (FB.2, 3, 5, 6 and 7)
  • Vickers F.B.12
  • Vickers F.B 19 Bullet
  • TsAGI-1EA [ru] helicopter (licence-built as M-2)
  • Nieuport 28
  • Sopwith Camel
  • Morane-Saulnier AI
  • Orenco B


-This Dummy Radial is Designed to be Hard Mounted on Your Models Firewall Using 30-min Epoxy. May also be Mounted Using Standoffs or Directly to the Cowling, 

-Constructed with a Metallic Finished Plastic, this Dummy Radial will be Sure to Add that Realistic Look to Any Model Aircraft.

-These Dummy Radials can be Painted or Glued Using Any Standard Hobby Grade Supplies.

-The Center is Hollow to Allow for Most Electric or Gasoline/Nitro Engines.

-Pushrod Holes are Incorporated into the Design to Accept Aluminum Tubing! (Not Included)


Need a Custom Size or Configuration? No Problem!

We will make you any size or configuration you need at no additional cost!


Plastic and Spring Steel


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