Hispano-Suiza 8
The Hispano-Suiza 8 (HS 8) is an aircraft engine from the Spanish manufacturer Hispano-Suiza . It is a water-cooled eight-cylinder V-engine with a 90 ° bank angle .
history
The engine was designed at the end of 1914 by the Swiss engineer Marc Birkigt , who founded the company in Barcelona in 1904 together with the Spaniard Damian Mateu . In 1911 a second plant was set up in Levallois-Perret near Paris. Until the beginning of the war, Hispano-Suiza only built automobiles and manufactured the engines themselves. It was not until December 1914 that the owners decided to also build aircraft engines. The first was a four-cylinder - line engine ; with two rows of cylinders, the HS 8 was created.
Special feature of coming in in February 1915 to the test first motor HS 8A were made of cast aluminum produced in one piece cylinder banks , in which the cylinder liners were screwed steel. The crankcase was divided horizontally. Each of the two rows of cylinders had an overhead camshaft with a vertical shaft drive. One inlet and one outlet valve per cylinder were actuated by the camshaft via bucket tappets .
After successfully passing the acceptance test on July 21, 1915, the engine was manufactured in France from 1915 onwards. From this first, 140 hp version, only 50 engines were made, which were equipped with a Claudel twin carburetor. From October 1915, the HS 8Aa version, equipped with a Zenith double carburetor and increased to 150 hp, was completed, for which Great Britain, Italy, Japan, Russia, Switzerland and also the USA acquired the reproduction rights and produced the engine in large numbers. The total number of this version was about 6000 units. In Great Britain the version HS 8Aa was manufactured as Wolseley Viper and used among other things in the Royal Aircraft Factory SE5 .
The improved version HS 8Ab was delivered from November 1916 and developed 180 hp due to higher compression. This version was initially used mainly by the French Navy. A total of 11,320 of these were manufactured in France, plus another 1,853 pieces at Wolseley. Both versions were u. a. used in the SPAD S.VII .
In April 1917 the Hispano-Suiza 8B came out with 200 HP, later 235 HP, and a standard reduction gear. The SPAD S.XIII was also equipped with this version . With a total of around 21,000 units built by a large number of licensees, this was one of the most widely used engines of the First World War.
In order to further increase the performance, the displacement was increased. This is how the HS 8F with 300 hp was created, which was also produced in the USA by the Wright-Martin Aircraft Company and their successors. Of this last version, about 9,000 pieces were made, 6,000 of them in the USA.
In order to achieve even higher performance, the development of the Hispano-Suiza 12 began in 1919 .
Technical specifications
| Hispano-Suiza | 8A | 8Aa | 8 Fig | 8B | 8F |
|---|---|---|---|---|---|
| Bore [mm] | 120 | 140 | |||
| Stroke [mm] | 130 | 150 | |||
| Displacement [cm³] | 11,760 | 11,730 | 18,500 | ||
| compression | 4.7 | 5.3 | |||
| Length [m] | 1.19 | 1.25 | 1.31 | 1.36 | 1.32 |
| Width [m] | 0.81 | 0.83 | 0.85 | 0.86 | 0.89 |
| Height [m] | 0.77 | 0.81 | 0.87 | 0.90 | 0.88 |
| Mass [kg] | 195 | 215 | 230 | 236 | 256 |
| Horsepower] | 140 | 150 | 180 | 200/235 | 300 |
| at speed | 1900 | 2000 | 2100 | 2300 | 2100 |
swell
- Description Hispano Suiza 8 (PDF file; 3 MB)
- Jane's all the worlds aircraft , 1919
