<!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{infobox aero engine |name=Hiero 6 |image=Phonix-engine.jpg |size=300px |alt= |caption=Hiero 6 engine of an Austro-Hungarian Phönix J.1 fighter biplane in a Swedish museum |engine_type =6-cyl water-cooled in-line piston engine <!-- The type of engine, eg: Air-cooled rotary, High-bypass turbofan --> |national_origin =Austria <!-- The country where the engine was first manufactured. Use the main nation (ie. UK), not constituent country (England); don't use "EU". List collaborative programs of only 2 or 3 nations; for more than 3, use "Multi-national --> |manufacturer =Hiero / Laurin & Klement Automobile Works <!-- The firm which manufactured the engine. --> |designer =Otto Hieronimus <!-- The person or persons who designed the engine. Only appropriate for single designers, not project leaders --> |first_run = <!-- The date that the engine was first run. If this hasn't happened, skip this field - don't speculate. --> |major_applications = <!-- aircraft (or other vehicles) that were powered by this engine --> |produced = <!-- Years in production (eg. 1970-1999) if still in active use but no longer built --> |number_built = <!-- Total program cost --> <!-- Incremental or flyaway cost for military or retail price for commercial aircraft --> |developed_from = <!-- The engine which formed the basis for this engine --> |variants_with_their_own_articles = <!-- Variants OF this engine --> }}
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.
==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 magnetos. 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 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: {{convert|145|hp|kW|abbr=on|1}} (probably designated '''Hiero B''' or '''Hiero C''' ) ;Hiero 185 hp: {{convert|185|hp|kW|abbr=on|1}} (probably designated '''Hiero D''') ;Hiero B: ;Hiero C: ;Hiero D: ;Hiero E: {{convert|200|hp|kW|abbr=on|1}} - {{convert|230|hp|kW|abbr=on|1}} ;Hiero L: ;Hiero N: {{convert|230|hp|kW|abbr=on|1}}
==Applications== * Aero A.14 * Letov Š-1 * Hansa-Brandenburg C.I * Phönix D.I * Ufag C.I * Lloyd C.II
==Specifications (Hiero E)== {{pistonspecs| <!-- If you do not understand how to use this template, please ask at Wikipedia talk:WikiProject Aircraft --> <!-- Please include units where appropriate (main comes first, alt in parentheses). If data are missing, leave the parameter blank (do not delete it). For additional lines, end your alt units with )</li> and start a new, fully formatted line with <li> --> |ref=''World Encyclopaedia of Aero Engines.''<ref name="Gunston WEoAE">{{cite book|last=Gunston|first=Bill|title=World Encyclopaedia of Aero Engines|location=Stroud|date=2006|edition=5th|isbn=0-7509-4479-X}}</ref> |type=6-cyl in-line Water-cooled |bore=135 mm (5.31 in) |stroke=180 mm (7.09 in) |displacement=15,459 cc (943.4 cu in) |length= |diameter= |width= |height= |weight= |valvetrain=overhead-cam |supercharger= |turbocharger= |fuelsystem= |fueltype= |oilsystem= |coolingsystem=water |power=200 - 230 hp (149 - 172 hp) |specpower= |compression= |fuelcon= |specfuelcon= |oilcon= |power/weight=
|designer=Otto Hieronimus |reduction_gear=
|general_other= |components_other= |performance_other= }}
==See also== {{aircontent <!-- other related articles that have not already linked: --> |see also=
<!-- designs which were developed into or from this aircraft: --> |related=
<!-- aircraft that are of similar role, era, and capability this design: --> |similar aircraft=
<!-- relevant lists that this aircraft appears in: --> |lists= *List of aircraft engines
<!-- For aircraft engine articles. Engines that are of similar to this design: --> |similar engines= *Austro-Daimler 6 *BMW IIIa *Liberty L-6 *Mercedes D.III *SPA 6A
<!-- See WP:Air/PC for more explanation of these fields. --> }}
==References== {{reflist}}
==Further reading== {{Commons category}} * Gunston, Bill. (1986). ''World Encyclopaedia of Aero Engines''. Patrick Stephens: Wellingborough. p. 23
{{Aeroengine-specs}}
Category:1910s aircraft piston engines Category:Straight-six engines