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From: Miloch <Miloch_member@newsguy.com>
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Subject: Grumman JF Duck
Date: 14 Mar 2017 07:23:50 -0700
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https://en.wikipedia.org/wiki/Grumman_JF_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.
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.
Role
Utility amphibian
National origin
United States
Manufacturer
Grumman
First flight
24 April 1933
Introduction
1935
Primary users
United States Navy
United States Marine Corps
Argentine Navy
United States Coast Guard
Number built
48
Variants
Grumman J2F Duck
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.
Specifications (JF-2)
General characteristics
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)
radial piston engine, 775 hp (578 kW)
Performance
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)
*
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