{{short description|1930s German piston aircraft engine}} <!-- This article is a part of Wikipedia:WikiProject Aircraft. Please see Wikipedia:WikiProject Aircraft/page content for recommended layout. --> {{infobox aero engine |name=As 8 |image=Argus As 8 1.jpg |caption=Argus As 8 aircraft engine |engine_type=Piston aircraft engine |manufacturer=Argus Motoren |first_run= |major_applications= |number_built = |developed_from = |developed_into = |variants_with_their_own_articles = }}
The '''Argus As 8''' was a four-cylinder, air-cooled, inverted inline aircraft engine produced in Germany by Argus Motoren in the 1930s.
==Variants== ;As 8A:Initial production version {{convert|95|hp|kW|abbr=on|disp=flip}} maximum for 5 minutes, {{convert|80|hp|kW|abbr=on|disp=flip}} continuous. ;As 8B:A more powerful variant developing {{convert|135|hp|kW|abbr=on|disp=flip}} maximum for 5 minutes, {{convert|115|hp|kW|abbr=on|disp=flip}} continuous. ;As 8R:A variant produced for sport aircraft, particularly for competition use, developing {{convert|150|hp|kW|abbr=on|disp=flip}} for take-off. Featuring: :*Increased compression ratio, from 5.36 to 5.8 :*Improved cooling by increasing the numbers of cooling fins at the cylinder head and the cylinder body :*Increasing the heat dispersing area of the pistons :*Improved crankcase and oil cooling :*Improved cylinder charging :*Modified valve timing
==Applications== *Albatros L 100 *Albatros Al 101 *Arado L II (As 8A) *Arado L IIa (As 8R) *Baumgärtl Heliofly III *BFW M.23 *BFW M.27 *BFW M.29 *BFW M.35 *Blohm & Voss Ha 136 *Comte AC-12 Moskito *Darmstadt D-22 *DFS 40 *Focke-Wulf Fw 44 *Heinkel He 64 *Heinkel He 72 *Klemm L 25E *Klemm Kl 32 *Raab-Katzenstein RK.25/32 *Ruhrtaler Ru.3
==Specifications (As 8B)== {{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=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=German |page=357}}</ref> Argus AS-8R<ref name=he64.com>{{cite web|title=Argus AS-8 R:|url=http://he64.com/?site=Engine&lang=en|website=he64.com|accessdate=12 August 2014}}</ref> |type=4-cylinder inverted air-cooled in-line piston engine |bore={{convert|120|mm|in|abbr=on|2}} |stroke= {{convert|140|mm|in|abbr=on|2}} |displacement={{convert|6.332|L|cuin|abbr=on|2}} |length={{convert|1075|mm|in|abbr=on|1}} without airscrew hub |diameter= |width={{convert|470|mm|in|abbr=on|1}} |height={{convert|731|mm|in|abbr=on|1}} |weight={{convert|116|kg|lb|abbr=on}} dry ::::{{cvt|128.4|kg|0}} equipped |valvetrain=Overhead valves operated by pushrods and rockers |supercharger= |turbocharger= |fuelsystem=One down-draught carburretor |fueltype=80 Octane Aviation gasoline |oilsystem=Pressure feed at {{cvt|3|-|6|bar|psi}} |coolingsystem=Air-cooled |power=<br> :*{{cvt|135|PS|hp kW|0}} at 2,200 rpm (5 minutes) at sea level :*{{cvt|125|PS|hp kW|0}} at 2,150 rpm (30 minutes) at sea level :*{{cvt|115|PS|hp kW|0}} at 2,090 rpm (max continuous) at sea level |specpower={{cvt|21.3|PS/L|hp/cuin kW/L}} |compression=5.35:1 |fuelcon= |specfuelcon=<br> :*{{cvt|0.235|kg/PSh|lb/hph kg/kWh}} at maximum rpm :*{{cvt|0.230|kg/PSh|lb/hph kg/kWh}} at maximum continuous rpm |oilcon={{cvt|0.008|kg/PSh|lb/hph kg/kWh}} at maximum continuous rpm |power/weight={{cvt|1.149|PS/kg|hp/lb kW/kg}} *'''B.M.E.P.:''' {{cvt|7.7|atm|bar psi}} |designer= |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 as 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= *Alfa Romeo 110 *Blackburn Cirrus Major *de Havilland Gipsy Major *Elizalde Tigre IV *Hirth HM 504 *Menasco C4 <!-- See WP:Air/PC for more explanation of these fields. --> }}
==References== {{Reflist}}
==Further reading== {{cite book |last= Gunston |first= Bill |title=World Encyclopedia of Aero Engines |year=1986 |publisher=Patrick Stephens |location= Wellingborough |pages=15 }}
==External links== {{Commons category|Argus As 8}} * [https://web.archive.org/web/20070930184633/http://www.luftfahrtmuseum.com/htmd/dtf/as8.htm Das Virtuelle Luftfahrtmuseum]
{{Argus aeroengines}}
Category:Aircraft air-cooled inline piston engines Category:Argus aircraft engines Category:1930s aircraft piston engines Category:Inverted aircraft piston engines Category:Straight-four engines