Douglas F3D Skyknight
|F3D (F-10) Skyknight|
|EF-10B Skyknight of VMCJ-2 Playboys|
|National origin||United States|
|Manufacturer||Douglas Aircraft Company|
|First flight||23 March 1948|
|Primary users||United States Navy|
United States Marine Corps
|Developed into||Douglas F6D Missileer|
The Douglas F3D Skyknight (later designated F-10 Skyknight) is an American twin-engined, mid-wing jet fighter aircraft manufactured by the Douglas Aircraft Company in El Segundo, California. The F3D was designed as a carrier-based all-weather night fighter and saw service with the United States Navy and United States Marine Corps. The mission of the F3D was to search out and destroy enemy aircraft at night.
The F3D Skyknight was never produced in great numbers but it did achieve many firsts in its role as a night fighter over Korea. While it never achieved the fame of the North American F-86 Sabre, it did down several Soviet-built MiG-15s as a night fighter over Korea with only one air-to-air loss of its own against a Chinese MiG-15, which occurred on the night of 29 May 1953.
The Skyknight played an important role in the development of the radar-guided AIM-7 Sparrow missile which led to further guided air-to-air missile developments. It also served as an electronic warfare platform in the Vietnam War as a precursor to the EA-6A Intruder and EA-6B Prowler. The aircraft is sometimes unofficially called "Skynight", dropping the second "k". The unusual, portly profile earned it the nickname "Willie the Whale". Some Vietnam War U.S. Marine veterans have referred to the Skyknight as "Drut", whose meaning becomes obvious when read backwards. This may be in reference to its age, unflattering looks or its low-slung air intakes that made it vulnerable to foreign object damage (FOD).
Design and development
The F3D was not intended to be a typical sleek and nimble dogfighter, but as a standoff night fighter, packing a powerful radar system and a second crew member. It originated in 1945 with a US 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. The result was an aircraft with a wide, deep, and roomy fuselage. Instead of ejection seats, an escape tunnel was used, similar to the type used in the A-3 Skywarrior.
The XF3D-1 beat out Grumman Aircraft Engineering Corporation's G-75 two-seat, four-engined, Westinghouse J30-powered night fighter design, and a contract was issued on 3 April 1946. The US Navy's Bureau of Aeronautics (BuAer) also issued a contract to Grumman for two G-75 (company designation) XF9F-1 (BuAer designation) experimental aircraft on 11 April 1946 in case the Skyknight ran into problems. Grumman soon realized that the G-75 was a losing design but had been working on a completely different, single-engined day fighter known as the Grumman G-79 which became the F9F Panther.[N 1]
The first flight of the XF3D-1 was on 23 March 1948 at Douglas' El Segundo facility with test pilot Russell Thaw at the controls.[N 2] Further flight testing followed at El Segundo until October 1948. Three prototypes were then taken to Muroc Air Force Base (later renamed Edwards Air Force Base) for service trials. These units were powered by two Westinghouse J34-WE-24 turbojets of 3,000 lbf (1,361 kgf) thrust, mounted under the roots of then-standard straight wings of the early jet era. A production contract for 28 F3D-1 J34-WE-32 powered production aircraft was issued in June 1948 with the first production aircraft flying on 13 February 1950.
As a night fighter that was not expected to be as fast as smaller daylight fighters, the expectation was to have a stable platform for its radar system and the four 20 mm cannon mounted in the lower fuselage. The F3D was, however, able to outturn a MiG-15. The fire control system in the F3D-1 was the Westinghouse AN/APQ-35. The AN/APQ-35 was advanced for the time, a combination of three different radars, each performing separate functions: an AN/APS-21 search radar, an AN/APG-26 tracking radar, both located in the nose, and an AN/APS-28 tail warning radar. The complexity of this vacuum tube-based radar system, which was produced before the advent of semiconductor electronics, required intensive maintenance to keep it operating properly.
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, but because of development problems with the J46, the F3D-2 was initially fitted with J34-WE-36 engines instead. Higher-thrust J34-WE-38 engines which increased aircraft performance were installed later. The F3D-2 also incorporated an improved Westinghouse AN/APQ-36 fire control 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.
The 28 F3D-1 aircraft were used primarily to train F3D crews and did not see combat in the Korean War. The F3D-2 Skyknight was only deployed to Korea by USMC land–based squadrons, beginning in September 1952. The Skyknight downed more enemy aircraft in Korea than any other single type of naval aircraft. The first air-to-air victory occurred on the night of 2 November 1952 in a USMC F3D-2 piloted by Major William T. Stratton, Jr., and his radar operator, Master Sergeant Hans C. Hoglind of VMF(N)-513 Flying Nightmares, Major Stratton shot down what he believed was a Yakovlev Yak-15 (even though no Yak-15s were reported in Korea) which was the first successful night radar interception by a jet of a jet. The Skyknight claimed its first MiG-15 jet fighter on 8 November 1952, when Captain O.R. Davis and Warrant Officer D.F. "Ding" Fessler downed a MiG-15 northwest of Pyongyang. USMC pilot Lt. Joseph Corvi and his radar operator Sergeant Dan George set another record with the Skyknight on the night of 10 December 1952, when they downed the first aircraft by an aircraft with a radar track and lock-on and without visual contact; they performed the feat by using their radar to lock onto a Polikarpov Po-2 biplane. They were also credited with another probable kill that night.
The number of USMC Skyknights in Korea was doubled in January 1953 to 24 which allowed them to effectively escort B-29 Superfortresses on night bombing missions. On 12 January 1953, an F3D-2 of VMF(N)-513 that was escorting B-29s on a night bombing mission was vectored to a contact and shot down the fourth aircraft by a Skyknight. By the end of the war, Skyknights had claimed six enemy aircraft (one Polikarpov Po-2, one Yakovlev Yak-15 and four MiG-15s). One aircraft was lost to enemy fire, which was piloted by LTJG Bob Bick and his crewman, Chief Petty Officer Linton Smith, on 2 July 1953. This aircraft was with a detachment from Fleet Composite Squadron FOUR (VC-4) at NAS Atlantic City, and was attached to Marine Fighter Squadron 513 (VMF(N)-513). While the Skyknight lacked the swept wings and high subsonic performance of the MiG-15, its powerful fire control system enabled it to find and shoot down other fighters at night, while most MiG-15s could only be guided by ground-based radar.
Post Korean War
After the Korean War, the F3D was gradually replaced by more powerful aircraft with better radar systems. Its 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. The Sparrow missile was developed at Pacific Missile Test Center and early test firings were conducted at Naval Ordnance Test Station China Lake.
In 1954, the F3D-2M was the first Navy jet aircraft to be fitted with an operational air-to-air missile: the Sparrow I, an all weather day/night BVR missile that used beam riding guidance for the aircrew to control the missile's track. Only 28 aircraft (12 F3D-1Ms, and 16 F3D-2Ms) were modified 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). A few aircraft were also converted for use as trainers and were designated F3D-2T. Some of these aircraft were fitted with a single 10" aerial reconnaissance photography camera, which was mounted in the tail section.
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 air-to-air missile, with the most important characteristics being its generous fuel capacity, its considerable time-on-station, a 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. Its weapons system would be adapted for the supersonic swing-wing General Dynamics-Grumman F-111B, the U.S. Navy version of a joint USAF/USN tactical jet aircraft which also specified side-by-side seating. The USAF version would eventually see service as an air-to-ground fighter bomber, but the Navy version, envisioned as a Fleet Air Defense fighter and dogfighter, would be cancelled when it was clear that its performance was not sufficient for an air-to-air dogfighter role. The AWG-9/Phoenix and TF30 turbofan engine would eventually enter service on the F-111B's successor, the swing-wing Grumman F-14 Tomcat.
Skyknights continued in service through the 1960s in a 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 jet fighter that also flew in Vietnam. EF-10Bs served in the Electronic warfare role during the Vietnam War until 1969. The large interior provided ample room for electronic equipment. U.S. Marine Composite Reconnaissance Squadron One VMCJ-1 Golden Hawks began operating the EF-10B in Vietnam on 17 April 1965 under Lt. Col Wes Corman at Da Nang Air Base Republic of Vietnam with six aircraft. No more than 10 EF-10Bs were in Vietnam at one time. The Electronic Warfare (EW) Skyknight was a valuable Electronic countermeasure (ECM) asset to jam the SA-2 surface-to-air missiles (SAM) tracking and guidance systems. VMCJ-1 made history when its EF-10Bs conducted the first USMC airborne radar jamming mission on 29 April 1965 to support a USAF strike mission. Four EF-10Bs also supported a massive strike on the SA-2 SAM sites near Hanoi on 27 July 1965.
Many U.S. aircraft were lost to SA-2 surface-to-air missiles in Vietnam and the electronic attack on the associated radar systems was known as "Fogbound" missions. The F3D also dropped chaff over the radar sites. The first EF-10B lost in Vietnam was to an SA-2 SAM on 18 March 1966, while four more EF-10Bs were lost in Vietnam to accidents and unknown causes. Their mission was gradually taken over by the more capable EA-6A "Electric Intruder", an Electronic Warfare/Electronic Countermeasures (EW/ECM) variant of the Grumman A-6 Intruder attack bomber. The EF-10B Skyknight continued to fly lower–threat EW missions until they were withdrawn from Vietnam in October 1969. The U.S. Navy's EKA-3 Skywarrior and the USAF's Douglas RB-66 Destroyer also took on EW missions.
The U.S. Marine Corps retired its last EF-10Bs in May 1970.
The U.S. Navy continued to use the F-10s for avionics systems testing. The F-10 was used as a radar testbed to develop the APQ-72 radar. The nose of an F-4 Phantom was added to the front of an F-10B. Another F-10 had a modified radome installed by the radar manufacturer Westinghouse. Yet another TF-10B was modified with the nose from an A-4 Skyhawk. In 1968, three Skyknights were transferred to the U.S. Army. These aircraft were operated by the Raytheon Corporation at Holloman AFB where they were used testing at the White Sands Missile Range into the 1980s; they were the last flyable Skyknights.
- Prototype aircraft, two Westinghouse J34-WE-24 turbojet engines of 3,000 lbf (1,361 kgf), APQ-35 search and target acquisition radar, four 20mm cannon, three built.
- Two-seat all-weather day or night-fighter aircraft, powered by two 3,000 lbf Westinghouse J34-WE-32 turbojet engines, tail warning radar, ECM, and other electronics that added over 5,000 lb (2,300 kg) of weight, 28 built. First flight: 13 February 1950.
- 12 F3D-1s were converted into missile-armed test aircraft, used in the development of the AIM-7 Sparrow air-to-air missile.
- Second Production version, initially powered by two 3,400 lbf (1,542 kgf) Westinghouse J34-WE-36 and later by two 3,600 lbf (16 kN) Westinghouse J34-WE-38 turbojet engines, 490 kn (560 mph; 910 km/h) @ 20,000 ft (6,100 m), equipped with wing spoilers, autopilot and an improved Westinghouse AN/APQ-36 radar, 237 built. First flight: 14 February 1951.
- One F3D-1 was used for special armament test in 1952.
- 16 F3D-2s were converted into missile armed aircraft. The F3D-2Ms were armed with AIM-7 Sparrow air-to-air missiles.
- 35 F3D-2s were converted into electronic warfare aircraft.
- Five F3D-2s were converted into night fighter training aircraft.
- 55 F3D-2s were used as radar-operator trainers and electronic warfare aircraft.
- Unbuilt project, intended to be an advanced version incorporating swept wings.
- 1962 re-designation of the F3D-1.
- 1962 re-designation of the F3D-2.
- 1962 re-designation of the F3D-2Q.
- 1962 re-designation of the F3D-1M.
- 1962 re-designation of the F3D-2M.
- 1962 re-designation of the F3D-2T2.
Aircraft on display
- BuNo 124598 – National Museum of Naval Aviation at NAS Pensacola, Florida.
- BuNo 124629 – Pima Air & Space Museum adjacent to Davis-Monthan AFB in Tucson, Arizona.
- BuNo 124630 – Flying Leatherneck Aviation Museum at MCAS Miramar, California.
- BuNo 125807 – Combat Air Museum in Topeka, Kansas.
- BuNo 125870, (repainted as BuNo 127039) – Korean War and Vietnam War memorial in Del Valle Park in Lakewood, California. Originally displayed in 1950s-era dark blue coloring, the aircraft was repainted in 1963 to the grey and white color scheme of Marine Corps aircraft at the time. With this repainting, the aircraft had the tail code "7L," which was the 1960s-era tail code for Marine Corps Air Reserve and Naval Air Reserve aircraft at nearby Naval Air Station Los Alamitos, California. In 2015, the aircraft was refurbished and painted in grey and white to depict a late 1950s-era Skyknight of VMFT(N)-20 with tail code "BP."
- BuNo 124618 – National Museum of the Marine Corps, in Quantico, Virginia.
- BuNo 124620 – Quonset Air Museum at Quonset State Airport (former NAS Quonset Point) in Quonset Point, Rhode Island.
- BuNo 125850 – Air Force Flight Test Center Museum at Edwards AFB, California. This aircraft served until 1970 as part of VMCJ-3 (U.S. Marine Composite Reconnaissance Squadron 3) based at Marine Corps Air Station El Toro, California, carrying tail code "TN."
- BuNo 127074 – Empire State Aerosciences Museum (ESAM) near Schenectady, New York. This F3D was operated by Raytheon in Massachusetts for electronics tests until it was donated to the Intrepid Sea-Air-Space Museum in New York City, New York. It was displayed at the museum from 1987 until April 2012, when it was one of three aircraft moved to the ESAM to make room for the Space Shuttle Enterprise. It is painted in the livery of U.S. Marine Night Fighter Squadron 513 (VMF(N)-513) as flown during the Korean War.
- Crew: 2
- Length: 45 ft 5 in (13.84 m)
- Wingspan: 50 ft 0 in (15.24 m)
- Width: 26 ft 10 in (8.18 m) wings folded
- Height: 16 ft 1 in (4.90 m) wings spread
- 16 ft 6 in (5.03 m) wings folded
- 18 ft 6 in (5.64 m) maximum height during wing fold
- Wing area: 400 sq ft (37 m2)
- Aspect ratio: 6.23
- Mean Aerodynamic Chord (MAC): 99.8 in (2,530 mm)
- Airfoil: NACA 1412
- Empty weight: 18,160 lb (8,237 kg)
- Gross weight: 23,575 lb (10,693 kg)
- Max takeoff weight: 27,681 lb (12,556 kg)
- Maximum landing weight: 24,500 lb (11,100 kg)
- Fuel capacity: Avgas 115/145 1,350 US gal (1,120 imp gal; 5,100 l) maximum internal fuel in:-
- Forward fuselage tank: 650 US gal (540 imp gal; 2,500 l)
- Centre fuselage tank: 290 US gal (240 imp gal; 1,100 l)
- Aft fuselage tank: 410 US gal (340 imp gal; 1,600 l)
- Optional drop-tanks under-wing 2x 150 US gal (120 imp gal; 570 l)
- Maximum speed: 491 kn (565 mph, 909 km/h) at 20,000 ft (6,100 m)
- Cruise speed: 339 kn (390 mph, 628 km/h)
- Stall speed: 80.6 kn (92.8 mph, 149.3 km/h) with approach power
- Range: 1,338 nmi (1,540 mi, 2,478 km) on internals
- Ferry range: 1,338 nmi (1,540 mi, 2,478 km) with 2 × 150 US gal (120 imp gal; 570 l) drop-tanks
- Service ceiling: 38,200 ft (11,600 m)
- g limits: +5.5 at 19,700 lb (8,900 kg)
- +5.1 at 21,374 lb (9,695 kg)
- +4 at 26,731 lb (12,125 kg)
- Rate of climb: 4,000 ft/min (20 m/s)
- Wing loading: 58.9 lb/sq ft (288 kg/m2)
- Thrust/weight: 0.288
- Guns: 4 × 20 mm (0.787 in) Hispano-Suiza M2 cannon, 200 rpg
- Rockets: 2 × 11.75 in (298 mm) Tiny Tim un-guided rockets
- Missiles: 4× Sparrow I air-to-air missiles (F3D-2M)
- Bombs: 2 × 2,000 lb (910 kg) bombs
- VHF command radio AN/ARC-1
- UHF command radio AN/ARC-27
- Intercom AN/AIC-4 or 4A
- DF AN/ARN-6
- Homing AN/ARN-21
- Homing Rx AN/ARR-2A
- Radar AN/APQ-35A or -35B
- Radar Westinghouse AN/APQ-36
- IFF AN/APX-6
- IFF (I-R) AN/APX-17
- UHF DF AN/ARA-25
- Rad.Alt. AN/APN-1
Aircraft of comparable role, configuration and era
- Avro Canada CF-100 Canuck
- Curtiss-Wright XF-87 Blackhawk
- de Havilland Sea Venom
- de Havilland Sea Vixen
- Gloster Javelin
- Lockheed F-94 Starfire
- Northrop F-89 Scorpion
- Yakovlev Yak-25
- List of fighter aircraft
- List of military aircraft of the United States
- List of military aircraft of the United States (naval)
- Due to some interesting bureaucracy, BuAer did not cancel the G-75 (XF9F-1) contract, however, but changed the wording to include three entirely different G-79 prototypes. The G-79 became the successful Grumman F9F Panther.
- Russell Thaw as a test pilot for Douglas, and besides the F3D, was responsible for a number of test programs, including the Douglas XB-43 Jetmaster and XF4D-1 Skyray.
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