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#1390753 - 03/28/04 06:46 AM Engines  
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Clerget Rotary Engine (Type 9) - France
Date: 1916
Cylinders: 9
Configuration: Rotary, Air cooled
Horsepower: 110 (82 kw)
R.P.M.: 1,200
Bore and Stroke: 4.7 in. (120 mm) x 5.9 in. (150 mm)
Displacement: 931 cu. in. (15.3 liters)
Weight: 295 lbs. (134 kg)
Clerget Rotary Engine (Type 9B) - France
Date: 1917
Cylinders: 9
Configuration: Rotary, Air cooled
Horsepower: 130 (96 kw)
R.P.M.: 1,250
Bore and Stroke:4.7 in. (120 mm) x 6.3 in. (160 mm)
Displacement: 992 cu. in. (16.3 liters)
Weight: 381 lbs. (173 kg)


The Clerget had neither the peculiar intake arrangements of the Gnome nor the strange connecting rods of the Le Rhone. Its valves were actuated by conventional rocker arms from two pushrods per cylinder, these constituting a recognition feature. Clergets were made in 110-hp and 130-hp models, and the 130 may have been a little overdeveloped, since it was subject to overheating. It used a special type of piston ring, called an "obdurator" ring, below the wrist pin to block heat transfer from the combustion area to the lower part of the cylinder. When this ring broke, as it was prone to do, the cylinder turned blue from the heat; a blue color meant that the steel had been heated to 600F (316C). Clergets were generally very well engineered except for this problem, those made in England by Gwynne being especially excellent.

Original material copyright 7/8/99 W. Ira Boucher. All Rights Reserved.
Website by Ira Designs last updated on March 28, 2004


"We have come to bring you Liberty and Equality, but don't lose your head about it. The first one of you moves without my permission will be shot." Marshal of the Empire Francois Lefebyre
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#1390754 - 03/28/04 06:47 AM Re: Engines  
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Date of Manufacture: 1915
Country: France
Horespower: 80
Cylinders: 9
Diameter: 960 mm
Depth: 890 mm
Weight: 130 Kg (dry)
Aircraft Example: Nieuport 17
The Le Rhone C-9 was a French air-cooled rotary engine rated at 80 hp. It was installed in combat airplanes early in WWI, but as larger and more powerful engines were developed, it was gradually relegated to training-type airplanes.
Le Rhone engines were quite dependable and by the end of the war, were being manufactured in England, Italy, and the U.S. in addition to France. In fact, the German-produced 110-hp Oberursel was practically and exact copy of the 110-hp LeRhone.

Original material copyright 7/8/99 W. Ira Boucher. All Rights Reserved.
Website by Ira Designs last updated on March 28, 2004


"We have come to bring you Liberty and Equality, but don't lose your head about it. The first one of you moves without my permission will be shot." Marshal of the Empire Francois Lefebyre
#1390755 - 03/28/04 06:49 AM Re: Engines  
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Oberursel UR-2
Country: Germany
Date of Manufacture: 1917
Horsepower:110
Diameter: 960 mm
Depth: 890 mm
Weight: 130 Kg (dry)
Aircraft Example: Fokker Dr.1
The Oberursel UR-2 rotary engine, rated at 110 horsepower, was the type used to power the Fokker Dr.1 Triplane. Built by the Oberursel Motoren Gesellschaft of Frankfurt, Germany, it was an exact copy of the famous French LeRhone 110-horsepower rotary engine. The UR-2 from von Richthofen's airplane is on display at the Imperial War Museum, London, England. This UR-2 is one of the very few others still in existence.

Original material copyright 7/8/99 W. Ira Boucher. All Rights Reserved.
Website by Ira Designs last updated on March 28, 2004


"We have come to bring you Liberty and Equality, but don't lose your head about it. The first one of you moves without my permission will be shot." Marshal of the Empire Francois Lefebyre

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