Friday, March 11, 2011

Douglas F3D Skyknight

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F3D (F-10) Skyknight
An EF-10B Skyknight of VMCJ-2 Playboys
Role Fighter aircraft
Manufacturer Douglas Aircraft Company
First flight 23 March 1948
Introduced 1951
Retired 1970
Status Phased out of service
Primary users United States Navy
United States Marine Corps
Number built 265
The Douglas F3D Skyknight, (later F-10 Skyknight) was a United States twin-engine, midwing jet fighter aircraft manufactured by the Douglas Aircraft Company in El Segundo, California. The F3D was designed as a carrier-based all-weather aircraft. It saw service with the United States Navy and United States Marine Corps. While it never achieved the notoriety of the North American F-86 Sabre it downed several MiG-15s as a night fighter over Korea against no losses of its own. It also served as an electronic warfare platform in the Vietnam War. The aircraft is sometimes unofficially called "Skynight", dropping the second "k".

Contents

  • 1 Design and development
  • 2 Operational history
  • 3 Variants
  • 4 Operators
  • 5 Aircraft on display
  • 6 Specifications (F3D-2)

Design and development

The F3D was not intended to be a typical sleek and nimble dogfighter, but it was a night fighter packing a powerful radar system and second crew member. It originated in 1945 with a U.S. Navy requirement for a jet-powered radar-equipped carrier-based night fighter. The Douglas team led by Ed Heinemann designed around the bulky air intercept radar systems of the time, with side-by-side seating for the pilot and radar operator [1]. The result was an airplane with a wide, deep, and roomy fuselage. Instead of ejection seats, an escape tunnel was used, similar to the A-3 Skywarrior[1].
Maintenance on an APQ-35 radar of a F3D-2 in Korea, 1953
Power was provided by two Westinghouse J34 turbojets mounted in the roots of then-standard straight wings of the early jet era. As a night fighter that was not expected to be as agile as smaller daylight fighters; the expectation was to be a stable platform for its radar system and the four 20 mm cannon mounted in the lower fuselage. The U.S. Navy awarded Douglas a contract for three XF3D-1 prototype aircraft on 3 April 1946. (The losing design from Grumman evolved into the F9F Panther.)[citation needed]
The radar system in the F3D-1 was the Westinghouse AN/APQ-35. The AN/APQ-35 was a combination of three different radars, each performing separate functions: an AN/APS-21 search radar, an AN/APG-26 fire control radar, both located in the nose, and an AN/APS-28 tail warning radar.[2] The complexity of this radar system, which was produced before the advent of semi-conductor electronics, required intensive maintenance to keep it operating fully.[citation needed]
First flight of the XF3D-1 occurred on 23 March 1948 [3]. A production contract for 28 F3D-1 production aircraft soon followed in June 1948. The F3D-1 was followed by the F3D-2, which was first ordered in August 1949. The F3D-2 was intended to have Westinghouse J46 engines in enlarged nacelles to replace the J34—WE-32 engines of the F3D-1. Development problems with the J46 lead to F3D-2 aircraft being fitted with J34-WE-36 engines instead. The F3D-2 also incorporated an improved Westinghouse AN/APQ-36 radar system. A total of 237 F3D-2s were built before production ended on 23 March 1952. A higher performance F3D-3 version with swept wings and J46 engines was planned, but was cancelled when the trouble-plagued J46 engine program was terminated.

Operational history

F3D-2s of VMFN-513 at Kunsan, Korea, in 1953
The few F3D-1 aircraft were used primarily to train F3D crews and did not see combat. F3D-2 aircraft, however, saw extensive service during the Korean War and destroyed more enemy aircraft in Korea than any other Navy or Marine fighter aircraft[4]. Although initially designed to shoot down bombers, they were painted in black and served to escort B-29 Superfortress bombers on night raids. They also flew nighttime intercept and interdiction missions. By the end of the war, while the F-86 Sabre would become famous for victories over MiG Alley, Skyknights had shot down six enemy aircraft (one Polikarpov Po-2 and five Mikoyan-Gurevich MiG-15) [5]. During that time there was the loss of one aircraft piloted by Lt. (jg) Bob Bick and crewman Chief Linton Smith on July 2, 1953. This aircraft was with a detachment from VC-4 of NAS Atlantic City, and was attached to Marine Squadron 513.[6] The first air-to-air victory occurred on 3 November 1952 in a United States Marine Corps F3D-2 piloted by Major William T. Stratton, Jr. and radar operator Master Sergeant Hans C. Hoglind of VMF(N)-513. While the Skyknight lacked the graceful swept wings and high subsonic performance of the MiG-15, its onboard radar enabled it to find and kill other fighters, while the MiG-15 could only be guided by ground-based radar to the general vicinity of large B-29 formations.
In the years after the Korean War, the F3D was gradually replaced by more powerful aircraft with better radar systems. The F3D's career was not over though; its stability and spacious fuselage made it easily adaptable to other roles. The F3D (under the designations F3D-1M and F3D-2M) was used to support development of a number of air-to-air missile systems during the 1950s, including the Sparrow I, II, and III and Meteor missiles[citation needed].
The F3D-2M was the first operational Navy jet aircraft to be fitted with an air-to-air missile, the Sparrow I, a missile that used beam riding guidance for the aircrew to control the flight of the missile. Only 38 aircraft (12 F3D-1Ms[7], and 16 F3D-2Ms[8]) were made able to use the missiles.
In the late 1950s, a number of the Marine F3D-2 aircraft were re-configured as electronic warfare aircraft and were designated F3D-2Q (later EF-10B). Also, a few aircraft were converted for use as trainers and were designated F3D-2T.
An EF-10B of VMCJ-1 over Vietnam in 1966
Skyknights continued service through the 1960s in gull white color scheme, when their contemporaries had long since been retired. In 1962, when the U.S. Navy and U.S. Air Force unified their designation systems, the F3D-1 was redesignated F-10A and the F3D-2 was re-designated F-10B. The Skyknight was the only Korean war fighter that also flew in Vietnam (as also did the A-1 Skyraider attack plane). EF-10Bs served in the electronic countermeasures role during the Vietnam War until 1969. The U.S. Marine Corps retired its last EF-10Bs in 1970. Some aircraft continued flying as testbeds for Raytheon until the 1980s.[9]
When the U.S. Navy issued a requirement for a fleet defense missile fighter in 1959, Douglas responded with the F6D Missileer, essentially an updated and enlarged F3D that would carry the AAM-N-10 Eagle long-range missile with the most important characteristics being able to carry a large load of fuel, long time-on-station, crew of two, and sophisticated electronics rather than speed or maneuverability. This concept which kept the straight wings in an age of supersonic jets was soon cancelled because it would not be able to defend itself against more nimble fighters.[10][11] Its weapon system would be adapted for the supersonic swing-wing General Dynamics/Grumman F-111B which also specified side-by-side seating, but would also prove vulnerable to MiGs. The AWG-9/Phoenix and TF30 turbofan engine (with afterburner) would eventually reach service on the F-14 Tomcat which could swing its wing straight forward for loiter.
The unusual portly profile earned it the nickname "Willie the Whale".[12] It is less clear how it also came to be known "drut."[13][14][15][16] It should be noted, however, that "Drut" is "Turd" spelled backward.

Variants

XF3D-1
Prototype aircraft, three built.
F3D-1 Skyknight
Two-seat all-weather day or night-fighter aircraft, powered by two 3,000 lbf (1,400 kgf) Westinghouse J34-WE-32 turbojet engines, 28 built.
F3D-1M Skyknight
12 F3D-1s were converted into missile-armed test aircraft. Used in the development of the AIM-7 Sparrow air-to-air missile.
F3D-2 Skyknight
Improved version, powered by two 4,600 lbf (2,100 kgf) Westinghouse J34-WE-36 or J34-WE-36A turbojet engines, equipped with an autopilot and a Westinghouse AN/APQ-36 radar, 237 built.
F3D-2B Skyknight
One F3D-1 Skynight was used for special armament test in 1952.
F3D-2M Skyknight
16 F3D-2s were converted into missile armed aircraft. The F3D-2Ms were armed with AIM-7 Sparrow air-to-air missiles.
F3D-3Q Skyknight
35 F3D-2s were converted into electronic warfare aircraft.
F3D-2T Skyknight
Five F3D-2s were converted into night fighter training aircraft.
F3D-2T2
55 F3D-2s were used as radar-operator trainers and electronic warfare aircraft.
F3D-3 Skyknight
Unbuilt project, intended to be an advanced version fitted with swept wings.
F-10A Skyknight
1962 re-designation of the F3D-1.
F-10B Skyknight
1962 re-designation of the F3D-2.
EF-10B Skyknight
1962 re-designation of the F3D-2Q.
MF-10A Skyknight
1962 re-designation of the F3D-1M.
MF-10B Skyknight
1962 re-designation of the F3D-2M.
TF-10B Skyknight
1962 re-designation of the F3D-2T2.

Operators

 United States

Aircraft on display

Specifications (F3D-2)

Orthographically projected diagram of the F3D-2 Skyknight.
Data from Standard Aircraft Characteristics F3D-2 "Skyknight" [18]
General characteristics
Performance
Armament

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