In 1914 Otto Hieronimus manufactured the six-cylinder Hiero E, also known as the Hiero 6 engine which was derived from earlier 4-cylinder engines. The Hiero engine like the

Austro-Daimler Austro-Daimler was an Austro-Hungarian automaker company, from 1899 until 1934. It was a subsidiary of the German ''Daimler-Motoren-Gesellschaft'' (DMG) until 1909. Early history In 1890, Eduard Bierenz was appointed as Austrian retailer. The com ...

powered many of Austria's World War I aircraft. Hiero aircraft engines were designed by Otto Hieronimus, a famous Austrian auto racer of the early 1900s. His initial designs were liquid-cooled inline engines built by the Laurin & Klement Automobile Works of Austria.

Design and development

The Hiero E had a 135 mm x 180 mm bore/stroke (15.46L / 943.4cuin) and delivered 200-230 hp. The engine had the typical features of an inline vertical 6-cylinder: aluminum crankcase, cast iron cylinders, one inlet and one exhaust valve per cylinder controlled by bars and rockers, as part of a "SOHC" (single overhead camshaft) valvetrain like the Mercedes D-series aviation engines of the German Empire, and dual ignition with two Bosch

magneto A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current. Unlike a dynamo, a magneto does not contain a commutator to produce direct current. It is categorized as a form of alternator, ...

s. During World War I, the highly regarded Hiero engines were built under license by Essler, Warschalowski & Company of Vienna and the Breitfeld-Daněk company of Czechoslovakia. A point of recognition of Hiero engines compared with other

Central Powers The Central Powers, also known as the Central Empires,german: Mittelmächte; hu, Központi hatalmak; tr, İttifak Devletleri / ; bg, Централни сили, translit=Tsentralni sili was one of the two main coalitions that fought in ...

OHC inlines is that the intake was on the right and the exhaust on the left. After World War I, production was continued by the Avia company and powered a number of their early aircraft.

Variants

;Hiero 145 hp: (probably designated Hiero B or Hiero C ) ;Hiero 185 hp: (probably designated Hiero D) ;Hiero B: ;Hiero C: ;Hiero D: ;Hiero E: - ;Hiero L: ;Hiero N:

Applications

Aero A.14 The Aero A.14 was a Czechoslovakian biplane military reconnaissance aircraft built in the 1920s. It was essentially a slightly modified version of the Hansa-Brandenburg C.I aircraft that Aero had built during World War I as the Ae.10, and for ...

* Letov Š-1 * Hansa-Brandenburg C.I * Phönix D.I *

Ufag C.I The UFAG C.I was a military reconnaissance aircraft produced in the Austro-Hungarian Empire during World War I, by the ''Ungarische Flugzeugfabrik Abteil Gesellschaft'' (UFAG) . It was introduced in April 1918, and was widely used on the Italian ...

* Lloyd C.II

Specifications (Hiero E)

References

External links

* http://home.adelphia.net/~aeroengine/Hiero.html * http://www.lompraha.cz/index.php?page=historielom&lang=en {{Aeroengine-specs 1910s aircraft piston engines Straight-six engines