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[1]The Lockheed XFV (sometimes referred to as the "Salmon")[2] [N 1] was an American experimental tailsitter prototype aircraft built by Lockheed in the early 1950s to demonstrate the operation of a vertical takeoff and landing (VTOL) fighter for protecting convoys.

XFV "Salmon"
Role	Experimental VTOL fighter aircraft Type of aircraft
National origin	United States
Manufacturer	Lockheed Corporation
First flight	16 June 1954
Primary user	United States Navy (intended)
Produced	1954
Number built	1 flying prototype plus 1 incomplete airframe

Design and development

The Lockheed XFV originated as a result of a proposal issued by the U.S. Navy in 1948 for an aircraft capable of vertical takeoff and landing (VTOL) aboard platforms mounted on the afterdecks of conventional ships. Both Convair and Lockheed competed for the contract but in 1950, the requirement was revised, with a call for a research aircraft capable of eventually evolving into a VTOL ship-based convoy escort fighter. On 19 April 1951, two prototypes were ordered from Lockheed under the designation XFO-1 (company designation was Model 081-40-01). Soon after the contract was awarded, the project designation changed to XFV-1 when the Navy's code for Lockheed was changed from O to V.[1]

The XFV was powered by a 5,332 hp (3,976 kW) Allison YT40-A-6 turboprop engine driving three-bladed contra-rotating propellers. The tail surfaces were a reflected cruciform v-tail (forming an x) that extended above and below the fuselage. The aircraft had an ungainly appearance on the ground with a makeshift, fixed landing gear attached.[3] Lockheed employees derisively nicknamed the aircraft the "pogo stick" (a direct reference to the rival Convair XFY's name).[4]

Testing and evaluation

To begin flight testing, a temporary non-retractable undercarriage with long braced V-legs was attached to the fuselage, and fixed tail wheels attached to the lower pair of fins. In this form, the aircraft was trucked to Edwards AFB in November 1953 for ground testing and taxiing trials. During one of these tests, at a time when the aft section of the large spinner had not yet been fitted, Lockheed chief test pilot Herman "Fish" Salmon managed to taxi the aircraft past the liftoff speed, and the aircraft made a brief hop on 22 December 1953. The official first flight took place on 16 June 1954.

Full VTOL testing at Edwards AFB was delayed pending the availability of the 7,100 shp Allison T54, which never materialized. After the brief unintentional hop, the aircraft made a total of 32 flights. All further XFV-1 flights did not involve any vertical takeoffs or landings. The XFV-1 was able to make a few transitions in flight from the conventional to the vertical flight mode and back, and had briefly held in hover at altitude. Performance remained limited by the confines of the flight test regime. With the realization that the XFV's top speeds would be eclipsed by contemporary fighters and that only highly experienced pilots could fly the aircraft, the project was cancelled in June 1955.[5]

Salmon taxied the XFV-1 on its temporary gear "from a standing start to 175 mph, and then brought it back down to a dead stop without any use of the brakes, all within a distance of one mile."[6]

Variants

• XFO-1/XFV-1: (Model 081-40-01) Two prototypes built, one flown.
• FV-2: Proposed production version (Model 181-43-02) was to have been powered by the T54-A-16 turboprop, incorporating a bullet-proof windshield, armor and radar in the fixed forward part of the nose spinner. The proposed armament was four 20 mm cannon fitted in the two wingtip pods. Alternatively, 48 23⁄4-inch folding-fin rockets could be fitted.

Aircraft on display

The single flying prototype [N 2] ended up as an exhibit at the Sun 'n Fun Campus Museum at Lakeland Linder International Airport in Lakeland, Florida. This example was refurbished at the museum's Buehler Restoration Center and is currently on outdoor display. The aircraft was assigned USN/USMC Bureau Number 138657, but was marked as 658 following restoration.[7] The second prototype, which was never completed, is on display at Los Alamitos Army Airfield in California.

Specifications (XFV-1)

General characteristics

• Crew: 1
• Length: 36 ft 10.25 in (11.23 m)
• Wingspan: 30 ft 10.1 in (9.4 m)
• Height: 36 ft 10.25 in (11.23 m)
• Wing area: 246 sq ft (22.85 m²)
• Empty weight: 11,599 lb (5,261 kg)
• Gross weight: 16,221 lb (7,358 kg)
• Max takeoff weight: 16,221 lb (7,358 kg)
• Powerplant: 1 × Allison XT40-A-14 turboprop, 6 blade contra-rotating, 5,100 shp (3,800 kW)

Performance

• Maximum speed: 580 mph (930 km/h, 500 kn)
• Cruise speed: 410 mph (660 km/h, 360 kn)
• Service ceiling: 43,300 ft (13,100 m)
• Rate of climb: 10,820 ft/min (55.0 m/s)
• Wing loading: 65.9 lb/sq ft (322 kg/m²)

Armament
4 × 20 mm (.79 in) cannons or 48 × 2.75 in (70 mm) rockets

Note: Performance estimates are based on XFV with YT40-A-14 engine.

See also

Aircraft of comparable role, configuration, and era

• Convair XFY
• Focke-Wulf Triebflügel
• Heinkel Lerche
• Ryan X-13 Vertijet

Related lists

• List of Lockheed aircraft
• List of fighter aircraft
• List of United States Navy aircraft designations (pre-1962)
• List of military aircraft of the United States

References

Notes

Citations

Bibliography

External links

Wikimedia Commons has media related to Lockheed XFV.

• "Heads Up Fighters." Popular Mechanics, May 1954, pp. 96–97.

На других языках

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[de] Lockheed XFV-1

Bei der Lockheed XFV-1 Salmon handelt es sich um einen in den USA in den 1950er Jahren entwickelten einsitzigen Heckstarter zur Abfangjagd. Der Zusatzname Salmon wurde nicht offiziell vergeben, sondern rührt wahrscheinlich vom Namen des Testpiloten Herman „Fish“ Salmon her. Meistens wurde die Maschine jedoch als Pogo angesprochen, obwohl der Name offiziell für den Konkurrenzentwurf der Convair XFY-1 vergeben wurde. Entwicklungsleiter war Clarence Johnson, Projektnummer von Lockheed war 081-400.

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- [en] Lockheed XFV

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[fr] Lockheed XFV

Le Lockheed XFV-1 (surnomme "Salmon" -Saumon- d'après le nom de son pilote d'essai Herman "fish" Salmon) est un avion militaire de la guerre froide construit par Lockheed pour l’United States Navy en 1953-1954 comme avion de chasse embarqué. Ce projet était très audacieux (l’appareil devait décoller et atterrir verticalement) et ne dépassa pas le stade du prototype. Il fut officiellement abandonné en 1956.

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[it] Lockheed XFV

Il Lockheed XFV (a volte chiamato anche Salmon in onore del pilota collaudatore Herman "Fish" Salmon) era un caccia turboelica VTOL in configurazione posacoda realizzato dall'azienda statunitense Lockheed Corporation negli anni cinquanta e rimasto allo stadio di prototipo.

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[ru] Lockheed XFV-1

XFV-1 Salmon (Лосось) — экспериментальный турбовинтовой самолёт-истребитель вертикального взлёта и посадки, созданный в начале 1950-х годов фирмой Lockheed.

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