Hiero 6

Hiero 6
Hiero 6 engine of an Austro-Hungarian Phönix J.1 fighter biplane in a Swedish museum
Type 6-cyl water-cooled in-line piston engine
National origin Austria
Manufacturer Hiero / Laurin & Klement Automobile Works
Designer Otto Hieronimus

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 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.