Franklin O-805
{{Short description|American air-cooled aircraft piston engine designed in the mid-1940s}}
| {{Infobox aircraft begin
|name= O-805/12AC |image = File:Franklin 805.jpg |caption = Franklin O-805 on display at the National Museum of the United States Air Force }} {{Infobox Aircraft Engine |type= 12-cylinder horizontally opposed piston engine |national origin = |manufacturer= Franklin Engine Company |first run=c.1945 |major applications= |number built = |program cost = |unit cost = |developed from = |developed into = |variants with their own articles = }} |
The Franklin O-805 (company designation 12AC) was an American air-cooled aircraft piston engine, designed in the mid-1940s and was to be used in radio-controlled pilotless drones that were to be guided from an accompanying control plane. Due to project requirement changes and cancellations the engine was not produced.{{citation|title=Franklin O-805-2|author=NMUSAF|date=June 8, 2015|url=https://www.nationalmuseum.af.mil/Visit/MuseumExhibits/FactSheets/Display/tabid/509/Article/195703/franklin-o-805-2.aspx|publisher=National Museum of the United States Air Force}}
A smaller displacement 12-cylinder Franklin engine of 1941 was known as the O-595 or 12AC-596.
Variants
=O-805=
;12AC-806:{{convert|450|hp|kW|abbr=on|0}}0
;12ACG-806 (XO-805-1):{{convert|456|hp|kW|abbr=on|0}} at 3,200 rpm, geared to 0.632:1.
;12ACGSA-806 (XO-805-3 and O-805-5):{{convert|500|hp|kW|abbr=on|0}} at 3,200 rpm, supercharged and geared to 0.632:1 (XO-805-3), or to 0.587:1 (O-805-5).
=O-595=
;12AC-596:{{convert|300|hp|kW|abbr=on|0}} at 2,600 rpm
;12ACG-596:{{convert|350|hp|kW|abbr=on|0}} at 3,500 rpm
Applications (intended)
Survivors
- There is an O-805-2 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT {{Cite web|url=http://neam.org/index.php?option=com_content&view=article&id=1073|title = New England Air Museum}}
- One surfaced and was sold privately in August, 2016, on eBay for US$8500.{{Cite web|url=http://bringatrailer.com/2016/08/29/13-liter-ww2-drone-engine-super-rare-franklin-0-805/|title = 13 Liter WW2 Drone Engine: Super Rare Franklin 0-805|date = 29 August 2016}}
Specifications (12ACGSA-806/XO-805-3)
{{pistonspecs
|
|ref=
|type=12-cylinder air-cooled horizontally opposed aircraft piston engine
|bore={{convert|4.625|in|mm|abbr=on|1}}
|stroke={{convert|4.0|in|mm|abbr=on|1}}
|displacement={{convert|806.4|cuin|L|abbr=on|1}}
|length=
|diameter=
|width=
|height=
|weight=
|valvetrain=OHV
|supercharger=
|turbocharger=
|fuelsystem=
|fueltype=
|oilsystem=
|coolingsystem=Air-cooled
|power={{convert|500|hp|kW|abbr=on|0}} at 3,200 rpm
|specpower=
|compression=
|fuelcon=
|specfuelcon=
|oilcon=
|power/weight=
|designer=
|reduction_gear=0.632
|general_other=
|components_other=
|performance_other=
}}
See also
References
;Notes
{{reflist}}
External links
{{Commons category}}
- [http://home.comcast.net/~aeroengine/FrkFam.html A table showing the relationship of the military models]
{{Franklin aeroengines}}
{{US military piston aeroengines}}
{{Aeroengine-specs}}