Grumman JF Duck
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|Grumman JF-2 Duck in United States Coast Guard service|
|National origin||United States|
|First flight||24 April 1933|
|Primary users||United States Navy
United States Marine Corps
United States Coast Guard
|Variants||Grumman J2F Duck|
The Grumman JF "Duck" was an American single-engine amphibious biplane built by Grumman for the United States Navy during the 1930s. The J2F Duck was an improved version of the JF, with its main difference being a longer float.
Design and development
The Grumman JF Duck was manufactured from 1934 until 1936, when production switched to the J2F Duck and later variants. The more obvious external appearance clue to distinguish a JF from an early J2F is the deletion of the inter-aileron strut between the wings on the J2F; less noticeable perhaps is the J2F's slightly longer rear fuselage/float joining fillet beneath the tail.
The Duck's main pontoon was part of the fuselage, almost making it a flying boat, though it appears more like a standard aircraft with an added float. This general configuration was shared with the earlier Loening OL. The XJF-1 prototype first flew on 24 April 1933 piloted by Grumman test pilot Paul Hovgard.
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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, a single bomb rack mounted under each wing, capable of carrying a 100 lb (45.4 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.
- Prototype with 700 hp Pratt & Whitney R-1535-62 engine, one built (BuNo 9218).
- Production variant with 700 hp Pratt & Whitney R-1830-62 Twin Wasp engine, 27 built (BuNos 9434-9455, 9523-9527).
- Variant for the United States Coast Guard powered by a 750 hp Wright R-1820-102 Cyclone engine, 15 built (BuNo 0266, 00371-00372, 01647, USCG V141-V155).
- 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.
Data from 
- Crew: 2–4
- Length: 33 ft 0 in (10.06 m)
- Wingspan: 39 ft 0 in (11.89 m)
- Height: 12 ft 8 in (3.86 m)
- Wing area: 409.0 sq ft (38.00 m2)
- Empty weight: 4,100 lb (1,860 kg)
- Gross weight: 5,760 lb (2,613 kg)
- Fuel capacity: 150 US gal (120 imp gal; 570 L)
- Powerplant: 1 × Pratt & Whitney R-1830 Twin Wasp 14-cyl two row air-cooled radial piston engine, 775 hp (578 kW)
- Maximum speed: 185 mph (298 km/h; 161 kn) at 7,000 ft (2,100 m)
- Cruise speed: 155 mph (249 km/h; 135 kn)
- Stall speed: 63 mph (101 km/h; 55 kn)
- Range: 620 mi (539 nmi; 998 km)
- Service ceiling: 22,000 ft (6,700 m)
- Rate of climb: 1,600 ft/min (8.1 m/s)
- Related development
- Aircraft of comparable role, configuration and era
- Allen 1983, p. 49.
- Jordan, Corey C. "Grumman's Ascendency: Chapter Two." Planes and Pilots Of World War Two, 2000. Retrieved: 22 July 2011.
- Allen Air Enthusiast Twenty-three, p.78.
- Allen Air Enthusiast Twenty-three, pp. 47–48.
- Aviation April 1937, pp. 70–71
- Allen, Francis J. "A Duck Without Feathers". Air Enthusiast, Issue 23, December 1983—March 1984, pp. 46–55, 77—78. Bromley, Kent UK: Pilot Press, 1983.
- "Specifications of American Airplanes". Aviation, Volume 36, No. 4, April 1937, pp. 66–71. (Registration required)
- 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.
- Ginter, Steve (2009). Grumman JF/J2F Duck. Naval Fighters. Nº84 (First ed.). California, United States: Ginter Books. ISBN 0-942612-84-1. Retrieved 31 January 2015.
- Nuñez Padin, Jorge Félix (2002). Grumman G.15, G.20 & J2F Duck. Serie Aeronaval (in Spanish). Nº15. Buenos Aires, Argentina: Museo de la Aviación Naval, Instituto Naval.
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