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((more citations needed|date=January 2015))
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|((Infobox aircraft begin
 |name= JF Duck
 |image= File:Grumman JF2 3.jpg((!))border
 |caption= Grumman JF-2 Duck in United States Coast Guard service
))((Infobox aircraft type
 |type= [[Utility aircraft|Utility]] [[amphibious aircraft|amphibian]]
 |national origin= United States
 |manufacturer= [[Grumman]] 
 |designer=
 |first flight= 24 April 1933
 |introduced= 1935
 |retired=
 |status=
 |primary user= [[United States Navy]]
 |more users= [[United States Marine Corps]] <br> [[Argentine Navy]] <br> [[United States Coast Guard]]
 |produced=
 |number built= 48
 |developed from= 
 |variants with their own articles= [[Grumman J2F Duck]]
 |developed into=
))
|}

The '''Grumman JF "Duck"''' was an American single-engine [[amphibious aircraft|amphibious]] [[biplane]] built by [[Grumman]] for the [[United States Navy]] during the 1930s. The [[Grumman J2F Duck|J2F Duck]] was an improved version of the JF, with its main difference being a longer [[Float (nautical)|float]].<ref name="Allen 49">Allen 1983, p. 49.</ref>

==Design and development==
The Grumman JF Duck was manufactured from 1934 until 1936, when production switched to the [[Grumman J2F Duck|J2F Duck]] and later variants.<ref name=Jordan2>Jordan, Corey C.  [http://www.planesandpilotsofww2.webs.com/Grumman2.html "Grumman's Ascendency: Chapter Two."] ((webarchive|url=https://web.archive.org/web/20120325044407/http://www.planesandpilotsofww2.webs.com/Grumman2.html |date=2012-03-25 )) ''Planes and Pilots Of World War Two,'' 2000. Retrieved: 22 July 2011.</ref> The more obvious external appearance clue to distinguish a JF from an early J2F is the deletion of the inter-[[aileron]] strut between the [[wing]]s on the J2F; less noticeable perhaps is the J2F's slightly longer rear [[fuselage]]/[[Float (nautical)|float]] joining fillet beneath the [[Empennage|tail]].<ref name=Jordan2/>

The Duck's main [[Float (nautical)|pontoon]] was part of the [[fuselage]], almost making it a [[flying boat]], although it appears more like a standard [[Fixed-wing aircraft|aircraft]] with an added float. The XJF-1 prototype first flew on 24 April 1933 piloted by Grumman test pilot Paul Hovgard.<ref name="Thruelson 77">Thruelson 'The Grumman Story' 1976, p. 77.</ref>

==Operational history==
((Expand section|date=April 2017))

The JF-1 that was first ordered had the same Pratt & Whitney R-1830-62 engine as the XJF-1 prototype. The US Navy ordered 27 JF-1s with the first Ducks delivered beginning in May 1934 to Norfolk NAS. These early production series had provisions for mounting a machine gun at the rear seat facing aft, as well as a single bomb rack mounted under each wing, capable of carrying a 100&nbsp;lb (45.4&nbsp;kg) bomb or depth charge on each. The main float was also a Grumman design (Grumman Model "A") and like the prototype, it included retractable main landing gear, making the Duck a true amphibian. Ducks served as general/utility amphibians for photographic, target-towing, scouting, and rescue work.((citation needed|date=April 2017))

==Variants==
;XJF-1: Prototype with 700&nbsp;hp [[Pratt & Whitney R-1535 Twin Wasp Junior|Pratt & Whitney R-1535-62]] engine, one built (BuNo 9218).
[[File:Grumman JF-1 Duck at NACA Langley Summer 1934.jpg|right|thumb|Grumman JF-1 Duck at Langley]]
;JF-1: Production variant with 700&nbsp;hp [[Pratt & Whitney R-1830 Twin Wasp|Pratt & Whitney R-1830-62]] Twin Wasp engine, 27 built (BuNos 9434-9455, 9523-9527).
;JF-2: Variant for the [[United States Coast Guard]] powered by a 750&nbsp;hp [[Wright R-1820|Wright R-1820-102]] Cyclone engine, 15 built (BuNo 0266, 00371-00372, 01647, USCG V141-V155).
;JF-3: JF-2 for the U.S. Navy, five built (BuNos 9835-9839).
;Grumman G-20:Armed version of the Grumman JF-2 for export to Argentina. Eight built.<ref name="ae23 p78">Allen ''Air Enthusiast'' Twenty-three, p.78.</ref>

==Operators==
((ARG))
* [[Argentine Navy]] – Operated eight G-20s.<ref name="ae23 p47-8">Allen ''Air Enthusiast'' Twenty-three, pp. 47–48.</ref>
;((USA))
* [[United States Navy]]
* [[United States Coast Guard]]
* [[United States Marine Corps]] – Operated one JF-2

==Specifications (JF-2)==
((Aircraft specs
|ref=<ref name="avwk437 p70">''Aviation'' April 1937, pp. 70–71</ref>
|prime units?=imp
<!--        General characteristics -->
|crew=2–4
|capacity= 
|length ft=33
|length in=0
|length note=
|span ft=39
|span in=0
|height ft=12
|height in=8
|wing area sqft=409.0
|empty weight kg=
|empty weight lb=4100
|empty weight note=
|gross weight kg=
|gross weight lb=5760
|gross weight note=
|fuel capacity=((convert|150|USgal|impgal L|abbr=on))
<!--        Powerplant -->
|eng1 number=1
|eng1 name=[[Pratt & Whitney R-1830 Twin Wasp]]
|eng1 type=14-cyl two row air-cooled radial piston engine
|eng1 hp=775
|eng1 note=
<!--        Performance -->
|max speed mph=185
|max speed note=at ((convert|7000|ft|m|abbr=on))
|cruise speed mph=155
|stall speed mph=63
|range miles=620
|ceiling ft=22000
|climb rate ftmin=1600
))

==See also==
((Aircontent
|related=
* [[Grumman J2F Duck]]
|similar aircraft=
* [[Loening OL]]
* [[Loening C-2]]
* [[Bellanca XSOE]]
|lists=
|see also=
))

==References==
===Notes===
((reflist))

===Bibliography===
* Allen, Francis J. "A Duck Without Feathers". ''[[Air Enthusiast]]'', Issue 23, December 1983 – March 1984, pp.&nbsp;46–55, 77–78. Bromley, Kent UK: Pilot Press, 1983. 
* [http://archive.aviationweek.com/issue/19370401/#!&pid=66 "Specifications of American Airplanes"]. ''[[Aviation Week & Space Technology|Aviation]]'', Volume 36, No. 4, April 1937, pp.&nbsp;66–71. (Registration required)
*((cite journal |last1=Lezon|first1=Ricardo Martin|last2=Stitt|first2=Robert M.|name-list-style=amp |title=Eyes of the Fleet: Seaplanes in Argentine Navy Service, Part 2|journal=Air Enthusiast |date=January–February 2004 |issue=109 |pages=46–59 |issn=0143-5450))
* Thruelsen, Richard. ''The Grumman Story''. New York: Praeger Publishers, Inc., 1976. ((ISBN|0-275-54260-2)).
* Treadwell, Terry. ''Ironworks: Grumman's Fighting Aeroplanes''. Shrewsbury, UK: Airlife Publishers, 1990. ((ISBN|1-85310-070-6)).

==Further reading==
* ((cite book |last=Ginter |first= Steve |year=2009 |title=Grumman JF/J2F Duck |edition= First |publisher= Ginter Books |series=Naval Fighters |volume=Nº84 |url= http://www.ginterbooks.com/NAVAL/NF84.htm |isbn= 978-0-942612-84-4 |location= California, United States |access-date= 31 January 2015 ))
* ((cite book |last=Nuñez Padin |first=Jorge Félix |year=2002 |title=Grumman G.15, G.20 & J2F Duck |publisher= Museo de la Aviación Naval, Instituto Naval |series=Serie Aeronaval |volume=Nº15 |language=es |location= Buenos Aires, Argentina ))

==External links==
((commons category|Grumman JF Duck))
* [http://www.aviation-history.com/grumman/j2f.html The Grumman J2F Duck]

((Grumman aircraft))
((USN utility aircraft))

[[Category:Grumman aircraft|J01F Duck]]
[[Category:1930s United States military utility aircraft|Grumman J01F]]
[[Category:Single-engined tractor aircraft]]
[[Category:Biplanes]]
[[Category:Floatplanes]]
[[Category:Amphibious aircraft]]
[[Category:Aircraft first flown in 1933]]

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