{{Short description|American air-cooled aircraft engine of the early 1940s}} {{Use mdy dates|date=July 2023}} {{Use American English|date=July 2023}} <!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. --> {{infobox aero engine |name= O-200/4AC-199 |image = File:Franklin O-200.jpg |caption = Franklin O-200 engine on display at the [[Hiller Aviation Museum]] |engine_type= [[Piston]] [[aircraft engine]] |national_origin = United States |manufacturer= [[Franklin Engine Company]] |first_run= 1941 |major_applications= |number_built = |developed_from = |developed_into = |variants_with_their_own_articles = }}

The '''Franklin O-200''' (company designation '''4AC-199''') was an American air-cooled aircraft engine of the early 1940s. The engine was of [[Flat-four engine|four-cylinder, horizontally-opposed layout]] and [[Engine displacement|displaced]] {{convert|200|cuin|L|abbr=on|0}}. The power output ranged between {{convert|65|hp|kW|abbr=on|0}} and {{convert|100|hp|kW|abbr=on|0}} depending on variant. The '''O-200-5 (4ACG-199)''' featured a [[Propeller speed reduction unit|geared propeller drive]].

==Variants== ;4AC-199: ::'''O-200-1''' ::'''O-200-3''' ::'''O-200-7''' ::'''O-200-9''' ;4ACG-199: ::'''O-200-5'''

==Applications== ===Direct drive=== *[[CAP-1 Planalto]] *[[CAP-5 Carioca]] *[[Aeronca Arrow]] *[[Babcock LC-11]] *[[Culver Cadet]] *[[Culver Cadet|LAR-90]] *[[Culver Cadet|XPQ-8]] *[[Culver Cadet|TDC-1 target drone]] *[[Interstate Cadet]] *[[Langley Twin]] *[[Monocoupe 90]] *[[Piasecki PV-2]] *[[Rearwin Skyranger]] *[[Sackett Jeanie]] *[[Stinson Voyager#Variants|Stinson 10]] *[[Stinson Voyager#Variants|Stinson L-9]] *[[Stout Skycar]]

===Geared drive=== *[[Stout Skycar|Convair (Stinson) Model 103]] *[[Spratt Tilt-Wing]] *[[Goodyear Duck]] *[[Interstate Cadet]] *[[Interstate L-6]] *[[Piper PA-7|Piper PA-7 Skycoupe]]

==Specifications (O-200-5/4ACG-199)== {{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={{fact|date=May 2012}} |type=4-cylinder air-cooled [[flat-4|horizontally opposed]] aircraft piston engine |bore=4.25 in (108 mm) |stroke=3.5 in (88.9 mm) |displacement=198.6 in³ (3.25 L) |length= |diameter= |width= |height= |weight=224 lb (102 kg) |valvetrain= |supercharger= |turbocharger= |fuelsystem= |fueltype= |oilsystem= |coolingsystem=Air-cooled |power=102 hp (76 kW) at 3,500 rpm |specpower= |compression= |fuelcon= |specfuelcon= |oilcon= |power/weight= }}

==See also== {{aircontent <!-- include as many lines are appropriate. additional lines/entries with carriage return. --> |see also= |related= |similar engines= *[[Continental O-200]] |similar aircraft=<!-- similar or comparable aircraft --> |lists=<!-- related lists --> *[[List of aircraft engines]] }}

==References== {{Commons category}} ;Notes {{reflist}} ;Bibliography {{refbegin}} * Gunston, Bill. (1986) ''World Encyclopedia of Aero Engines''. Patrick Stephens: Wellingborough. p.&nbsp;57 {{refend}}

{{Franklin aeroengines}} {{US military piston aeroengines}}

[[Category:Franklin aircraft engines]] [[Category:1940s aircraft piston engines]] [[Category:Boxer engines]] [[Category:Four-cylinder engines]] [[Category:Air-cooled aircraft piston engines]]