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Grumman JF Duck

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JF Duck
Grumman JF2 3.jpg
Grumman JF-2 Duck in United States Coast Guard service.
Role Utility amphibian
Manufacturer Grumman
First flight 24 April 1933 (XJF-1 prototype)
Introduction 1935
Primary users United States Navy
United States Coast Guard
United States Marine Corps
Number built 48
Variants Grumman J2F Duck

The Grumman JF "Duck" was a single-engine amphibious biplane.

Design and developmentEdit

The Grumman JF Duck was manufactured from 1934 until 1936, when production switched to the J2F Duck and later variants.[1] 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.[1]

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.

Operational historyEdit

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.

VariantsEdit

XJF-1
Prototype with 700 hp Pratt & Whitney R-1535-62 engine, one built (BuNo 9218).
Grumman JF-1 Duck at NACA Langley Summer 1934

Grumman JF-1 Duck at Langley

JF-1
Production variant with 700 hp 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 hp 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).
JF-4
JF-5
JF-6
Grumman G-20
Civilian version of the Grumman JF-2

OperatorsEdit

United States

Flag of Argentina.svg Argentina

Specifications (JF)Edit

Data from [2]

General characteristics
  • Crew: 3
  • Capacity: 851 lb (386 kg) payload
  • Length: 32 ft 7 in (9.93 m)
JF-1 & JF-3: 33 ft (10 m)
  • Wingspan: 39 ft 0 in (11.89 m)
  • Height: 15 ft 1 in (4.60 m)
  • Powerplant: 1 × Pratt & Whitney R-1830 Twin Wasp 14-cyl two row air-cooled radial piston engine, 700 hp (520 kW)
JF-1: 1 x 700 hp (522 kW) Pratt & Whitney R-1830-62
JF-2: 1 x 720 hp (537 kW) Pratt & Whitney R-1830-102
JF-3: 1 x 750 hp (559 kW) Pratt & Whitney R-1830-80

Performance

See alsoEdit

ReferencesEdit

Notes
  1. 1.0 1.1 Jordan, Corey C. "Grumman's Ascendency: Chapter Two." Planes and Pilots Of World War Two, 2000. Retrieved: 22 July 2011.
  2. Eckland, K.O. "Grumman Aircraft: JF Duck." Aerofiles.com, 11 August 2008. Retrieved: 7 May 2012.
Bibliography
  • 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.
  • 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.
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External linksEdit

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