Hiero 6

Hiero aircraft engines were designed by Otto Hieronimus, a famous Austrian auto racer of the early 1900's. His initial designs were liquid-cooled inline engines built by the Laurin & Klement Automobile Works of Austria. In 1914 Otto Hieronimus manufactured the six cylinder Hiero E engine which was derived from earlier 4 cylinder engines. The Hiero engine like the Austro-Daimler powered many of Austria's WWI aircraft.

The Hiero E had a 135mm x 180mm bore/stroke and delivered 200-230hp. The engine had the typical features of an inline vertical 6 cylinder: aluminum bed, cast iron cylinders, one inlet and one exhaust valve per cylinder controlled by bars and rockers, with the cam-shaft in the bed, and dual start by two Bosch magneto's. During WWI, 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 OHC inline's is that the intake was on the right and the exhaust on the left. After WWI production was continued by the Avia company and powered a number of their early aircraft.

Applications

* Aero A.14
* Letov Š-1
* Phönix C.I
* Phönix D.I
* UFAG C.I
* LLOYD C.II

References

* http://home.adelphia.net/~aeroengine/Hiero.html
* http://www.lompraha.cz/index.php?page=historielom&lang=en
* Gunston, Bill. (1986). "World Encyclopaedia of Aero Engines". Patrick Stephens: Wellingborough. p.23