View source for Hirth HM 506

{{Short description|1930s German aircraft engine}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see 
[[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox aircraft begin
 |name = HM 506
 |image = 
 |caption = 
}}{{Infobox aircraft engine
 |type=[[Inline engine (aviation)|Inline]] [[Reciprocating engine|piston engine]] 
 |manufacturer=[[Hirth|Hirth Motoren GmbH]]
 |national origin= Germany
 |first run=
 |major applications=[[Bücker Bü 133]]
 |number built =  
 |program cost = 
 |unit cost = 
 |developed from = 
 |developed into = 
 |variants with their own articles =
}}
|}
The '''Hirth HM 506''' was a six-cylinder air-cooled inverted inline engine that was developed from the earlier four-cylinder HM 504.<ref name="Gun">{{cite book |last=Gunston |first=Bill |title=World Encyclopaedia of Aero Engines |year=1989 |publisher=Patrick Stephens Limited |location=Cambridge, England |isbn=978-1-85260-163-8 |edition=2nd |page=77}}</ref>  The HM 506 was a popular engine for light aircraft of the 1930s to 1940s and powered the [[Bücker Bü 133]]A model trainer.  The engine featured a cast magnesium alloy crankcase.

==Applications==
*[[Bücker Bü 133|Bücker Bü 133 A]]
*[[Fieseler Fi 99]]
*[[Fieseler Fi 157]] ([[Unmanned aerial vehicle|UAV]] prototype)
*[[Fieseler Fi 158]] ([[Unmanned aerial vehicle|UAV]] prototype)
*[[Gotha Go 241]]
*[[Klemm Kl 35|Klemm Kl 35 B (D-ERLQ)]]

==Specifications (HM 506A)==

{{pistonspecs
<!-- 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=Jane's All the World's Aircraft 1938,<ref name=JAWA1938>{{cite book |title= Jane's All the World's Aircraft 1938|last= Grey |first= C.G. |year=1972|publisher= David & Charles|location= London|isbn=0-7153-5734-4|pages=60d-61d}}</ref> Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944<ref name=schneider>{{cite book |last=Schneider |first=Helmut (Dipl.Ing.) |title=Flugzeug-Typenbuch. Handbuch der deutschen Luftfahrt- und Zubehör-Industrie 1944 |date=1944 |publisher=Herm. Beyer Verlag |location=Leipzig |isbn=381120484X |edition=Facsimile reprint 1986 |language=de |page=396}}</ref>
|type=6-cylinder air-cooled inverted inline 
|bore={{cvt|105|mm|2}}
|stroke={{cvt|115|mm|2}}
|displacement={{cvt|5.976|L|cuin|2}}
|length={{cvt|1276|mm|1}}
|diameter=
|width={{cvt|490|mm|1}}
|height={{cvt|735|mm|1}}
|weight={{cvt|149|kg|0}} dry, unequipped
::::{{cvt|174|kg|0}} wet, equipped
|valvetrain=1 inlet and 1 exhaust valve per cylinder, operated by push-rods and rockers
|supercharger=
|turbocharger=
|fuelsystem=2x SUM 713/1 down draught carburetters, automatic mixture control and suitable for inverted flight.
|fueltype=[[80 Octane]]
|oilsystem=Fresh oil, metered for each cylinder.  Rockers in oil bath.
|coolingsystem=air
|power=<br>
:*{{cvt|160|PS|hp kW|0}} at 2,500 rpm (5 minutes) at sea level
:*{{cvt|145|PS|hp kW|0}} at 2,420 rpm (30 minutes) at sea level
:*{{cvt|130|PS|hp kW|0}} at 2,330 rpm (max. continuous / cruise) at sea level
|specpower={{cvt|26.8|PS/L|hp/cuin kW/L|2}}
|compression=6.2:1
|fuelcon=
|specfuelcon={{cvt|0.220|kg/PSh|lb/hph kg/kWh|3}} at max continuous
|oilcon={{cvt|0.003|kg/PSh|lb/hph kg/kWh|3}} at max continuous
|power/weight={{cvt|1.075|PS/kg|hp/lb kW/kg}}
*'''B.M.E.P.:''' {{cvt|9.65|atm|bar psi}}
}}

==References==
{{reflist}}

<!--==Further reading==-->

==External links==
*[http://www.hirth-engines.de Göbler-Hirthmotoren Company website no historical section]
*[http://www.luftfahrt-archiv-hafner.de no access - for sale of Hirth Flugmotoren manuals]

{{Hirth aeroengines}}

[[Category:Hirth aircraft engines]]
[[Category:Air-cooled aircraft piston engines]]
[[Category:1930s aircraft piston engines]]
[[Category:Inverted aircraft piston engines]]
[[Category:Straight-six engines]]