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((Short description|Radial engine brand))
((More citations needed|date=December 2013))
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|((Infobox aircraft begin
 |name =((plainlist|
*LeBlond radial engines
*Ken-Royce engines
))
 |image = LeBlond 90-5F engine.jpg
 |caption = LeBlond 5-F 90 hp engine
))((Infobox Aircraft Engine
 |type=[[Radial engine]]
 |manufacturer=((plainlist|
*[[LeBlond Aircraft Engine Corporation]]
*[[Rearwin Airplanes|Rearwin Aircraft & Engines]]
))
 |national origin=
 |first run=
 |major applications=
 |number built =  
 |program cost = 
 |unit cost = 
 |developed from = 
 |developed into = 
 |variants with their own articles = 
))
|}

The '''LeBlond radial engines''', later produced under the name '''Ken-Royce''', were a family of 3-cylinder, 5-cylinder and 7-cylinder, air-cooled [[Radial engine|radial engines]] for aircraft, built in the 1930s by the [[LeBlond Aircraft Engine Corporation]] until the operation was sold to [[Rearwin Airplanes]] in 1937 and renamed Ken-Royce Engines.<ref name="WRIGHT">((cite book |last1=Wright |first1=Bill |title=Rearwin: A Story of Men, Planes, and Aircraft Manufacturing During the Great Depression |url=https://archive.org/details/rearwinstoryofme0000wrig |url-access=registration |date=1997 |publisher=Sunflower University Press |location=Manhattan, Kansas |isbn=0-89745-207-0))</ref>

==Products==
;LeBlond 40-3:3-cylinder air-cooled radial engine.<ref name=JAWA1928/>
;LeBlond 60-5D
:Introduced in 1928,<ref name = aeroplants>((cite web | title = Powerplants: Reciprocating Engines | work = AeroFiles | url = http://www.aerofiles.com/motors.html | archive-url = https://web.archive.org/web/20210422132105/http://www.aerofiles.com/motors.html | archive-date = 2021-04-22 | last = Eckland | first = K.O. | date = 2008-10-13 ))</ref> the 60-5D was a 60&nbsp;hp (45 kw)  5-cylinder, air-cooled, radial piston engine with a displacement of 234 cuin  (3.8 L).<ref name = 5d>"LeBlond Engines aero engines: LeBlond 5D." PilotFriend. N.p., n.d. Web. 20 June 2010. <http://www.pilotfriend.com/aero_engines/engine_specs/LeBlond%20Engines.htm>.</ref> This model used iron cylinder heads<ref name = rearwin>"Rearwin Aircraft Engines." PilotFriend. N.p., n.d. Web. 20 June 2010. <http://www.pilotfriend.com/aero_engines/engine_specs/Ken_Royce%20Motors/blank.htm>.</ref> and was a direct development of the [[Detroit Air-Cat]].<ref name = aeroplants/><ref name=JAWA1928/>
;LeBlond 70-5DE
:Introduced in 1930,<ref name = aeroplants/> the 70-5F was a 70&nbsp;hp (52 kw) at 1,950 rpm 5-cylinder, air-cooled, radial piston engine, (4.125 x 3.75 = 250.57 cuin (4.11 L)), using iron cylinder heads and two bearings.<ref name = rearwin/>
;LeBlond 85-5DF
:Introduced in 1930,<ref name = aeroplants/> the 85-5F was an 85&nbsp;hp (63 kw) at 1,975 rpm 5-cylinder, air-cooled, radial piston engine, (4.25 x 3.75 = 265.99 (4.36 L)), using aluminum cylinder heads and three bearings.<ref name = rearwin/>
;LeBlond 70-5E
:Introduced in 1930,<ref name = aeroplants/> the 70-5E was a 70&nbsp;hp (52 kw) 5-cylinder, air-cooled, radial piston engine.<ref name = rearwin/> Production of the 5E continued under Ken-Royce Engines as the Ken-Royce 5E.<ref name = aeroplants/>
;LeBlond 80-5F
:Introduced in 1930,<ref name = aeroplants/> the 80-5F was an 80&nbsp;hp (60 kw) 5-cylinder, air-cooled, radial piston engine with a displacement of 266 cubic inches (4.4 litres)<ref name = "leblond/ken-royce"/> Using three bearings as developed for the earlier 5DF series, the LeBlond 5F was introduced in 1930. When aircraft powered with the 5F were commandeered by the U.S. Army, the engine was re-designated the R-265.<ref name = "leblond/ken-royce">"LeBlond / Ken-Royce Engines aircraft engine specifications." PilotFriend. N.p., n.d. Web. 20 June 2010. <http://www.pilotfriend.com/aero_engines/engine_specs/LeBlond%20Engines.htm>.</ref> This engine was the last of the so-called 'greasers'. Production of the 5F continued under Ken-Royce Engines<ref name = rearwin/> as the Ken-Royce 5G.<ref name = aeroplants/>
;LeBlond 85-5DF
:Introduced in 1930,<ref name = aeroplants/> the 85-5F was an 85&nbsp;hp (63 kw) 5-cylinder, air-cooled, radial piston engine with a displacement of 266 cubic inches (4.4 litres)<ref name = "leblond/ken-royce"/>
;LeBlond 90-5F
:Introduced in 1930,<ref name = aeroplants/> the 90-5F was a 90&nbsp;hp (68 kw) 5-cylinder, air-cooled, radial piston engine with a displacement of 266 cubic inches (4.4 litres)<ref name = "leblond/ken-royce"/>
;LeBlond 90-5G
:Introduced in 1930,<ref name = aeroplants/> the 90-5G was a 90&nbsp;hp (68 kw) 5-cylinder, air-cooled, radial piston engine with a displacement of 266 cubic inches (4.4 litres)<ref name = aeroplants/> Production of the 5G continued under Ken-Royce Engines<ref name = rearwin/> as the Ken-Royce 5G.<ref name = aeroplants/>
;LeBlond 90-7D: 90&nbsp;hp (67.1&nbsp;kW) at 1,975rpm 4.125 x 3.75 = 350.81 cu in (5.75 L)<ref name=JAWA1928>((cite book |title=Jane's all the World's Aircraft 1928 |editor1-last=Grey |editor1-first=C.G. |year=1928 |publisher=Sampson Low, Marston & company, ltd |location=London |pages=56d-57d))</ref>
;LeBlond 110-7DF:110&nbsp;hp (82.1&nbsp;kW) at 2,150rpm 4.25 x 3.75 = 372.39 cu in (6.10 L)
;LeBlond 120-7
;Ken-Royce 7F
:Introduced by Ken-Royce Engines in 1939 as a 120hp development of the LeBlond 7DF by increasing the [[compression ratio]] and changing the intake and [[carburetor]].<ref name="WRIGHT" />((rp|153))

==Applications==
* [[Aeronca L]]
* [[Arrow Sport]]
* [[Ellingston Special]]
* [[Rearwin Sportster]]
* [[Vulcan American Moth Monoplane]]
* [[Niagara Amphibion]]
* [[Watkins Skylark]]

==Specifications==
((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=''Jane's all the World's Aircraft 1928'' <ref name=JAWA1928>((cite book |title=Jane's all the World's Aircraft 1928 |editor1-last=Grey |editor1-first=C.G. |year=1928 |publisher=Sampson Low, Marston & company, ltd |location=London |pages=56d-57d))</ref>
|type=Three, five and seven cylinder radial piston engines
|bore=((cvt|4.125|in))
|stroke=((cvt|3.75|in))
|displacement=<br>
**'''40-3''' ((cvt|150.7|cuin|L))
**'''60-5''' ((cvt|251.2|cuin|L))
**'''90-7''' ((cvt|351.7|cuin|L))
|length=<br>
**'''40-3''' ((cvt|21.94|in))
**'''60-5''' ((cvt|21.56|in))
**'''90-7''' ((cvt|22.25|in))
|diameter=((cvt|32.75|in)) all models
|width=
|height=
|weight=<br>
**'''40-3''' ((cvt|168|lb))
**'''60-5''' ((cvt|210|lb))
**'''90-7''' ((cvt|250|lb))
|valvetrain=Cam-plate driven push-rods with rockers driving one inlet and one exhaust overhead valves per cylinder
|supercharger=
|turbocharger=
|fuelsystem=one Zenith carburetor
|fueltype=Aviation gasolene
|oilsystem=
|coolingsystem=Air-cooled
|power=<br>
**'''40-3''' ((cvt|40|hp)) at 1,900 rpm
**'''60-5''' ((cvt|60|hp)) at 1,800 rpm
**'''90-7''' ((cvt|90|hp)) at 1,850 rpm
|specpower=
|compression=
|fuelcon=
|specfuelcon=((cvt|0.55|lb/hph|kg/kWh))
|oilcon=
|power/weight=

|designer=
|reduction_gear=

|general_other=
|components_other=2x Scintilla magnetos
|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=
*[[Armstrong Siddeley Genet Major]]
*[[Warner Scarab]]
<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
))

==References==
((Commons category|LeBlond aircraft engines))
((reflist))

((LeBlond aeroengines))

((DEFAULTSORT:Leblond 5))
[[Category:Radial engines]]
[[Category:1930s aircraft piston engines]]

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