Friday, March 11, 2011

Folland Gnat

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Gnat
Gnat T.1 during a display at Kemble Air Day in 2008
Role Fighter and trainer
Manufacturer Folland Aircraft
Designed by W.E.W. Petter
First flight 18 July 1955
Introduced 1959, RAF
Retired 1979, UK
Primary users Royal Air Force
Indian Air Force
Finnish Air Force
Number built 449 (including HAL Ajeet)
Developed from Folland Midge
Variants HAL Ajeet
The Folland Gnat was a small, swept-wing British subsonic jet trainer and light fighter aircraft developed for the Royal Air Force, and flown extensively by the Indian Air Force. It was designed by W.E.W. Petter, and first flew in 1955. Its design allowed its construction without specialised tools by countries not highly industrialised.[1][2] Although never used as a fighter by the Royal Air Force (RAF), the Gnat T.1 trainer variant was widely used. The Gnat became well known as the mount for the RAF Red Arrows aerobatic team.
The Gnat also achieved export success, particularly with India, the largest foreign operator who manufactured the aircraft under licence. India then developed the HAL Ajeet, a modified and improved variant.

Contents

  • 1 Design and development
  • 2 Operational history
    • 2.1 Royal Air Force
    • 2.2 Finland
    • 2.3 India
      • 2.3.1 Indo-Pakistani War of 1965
      • 2.3.2 Bangladesh Liberation War 1971
      • 2.3.3 After 1971
  • 3 Variants
  • 4 Operators
  • 5 Survivors
  • 6 Specifications (Gnat F.1)
  • 7 Notable appearances in media

Design and development

The Gnat was the creation of W.E.W. "Teddy" Petter, a British aircraft designer formerly of Westland Aircraft and English Electric. Designed to meet the 1952 Operational Requirement OR.303 calling for a lightweight fighter, Petter believed that a small, simple fighter would offer the advantages of low purchase and operational costs. New lightweight turbojet engines that were being developed enabled the concept to take shape.[1] Petter's first design resulted in the private venture Folland Midge which had a short lifespan, but served as a proof-of-concept design.
The Midge first flew on 11 August 1954 but was destroyed in a crash on 20 September 1955. The Gnat, being developed in parallel with the Midge, was an improved version of the original fighter design, differentiated by larger air intakes and provision for a 30 mm Aden cannon in each intake lip.[3]
Gnat F.1 single seat fighter variant at the 1957 Paris Air Salon
One of the hallmarks of the Gnat's design was its compact size. However, to achieve such a size, its systems were closely packed, making maintenance more difficult. Some of its systems were not noted for their reliability and the aircraft suffered from high operating costs. There were also concerns that its cockpit was cramped and obstructed the instructor's forward visibility.[4] Furthermore, the limited weapons load and reduced fuel capacity – both designed to reduce overall kerb weight – meant that it could not operate for protracted periods. Despite the shortcomings, the Gnat and the Midge were praised by the RAF evaluation and the test pilots in the 1955 Gnat Flight Development Team that included a pilot from India. The lower purchase price of the Gnat, its compact dimensions, as well as "good press" for the aircraft in air shows, were among the factors that prompted a spurt in its export sales.[5]

Operational history

Royal Air Force

An operational Folland Gnat T.1 of No.4 Flying Training School at RAF Valley in 1967
Gnat T.1 on display in 2009
Although the Gnat was evaluated by the RAF in 1958 as a possible DH Venom replacement, the Hawker Hunter was the eventual winner of the fly-off competition. Although RAF interest waned in its possible use as a fighter, the Gnat was modified to meet the 1957 Trainer Specification T.185D that called for an advanced two-seat trainer that could transition pilots between the current DH Vampire T 11 and operational fighters such as the English Electric Lightning. After review of Folland's proposals, an initial contract for 14 modified Gnat trainers was issued in 7 January 1958.[6] The Folland Fo.144 Gnat Trainer served in the RAF with the designation Gnat T Mk 1. It was notable as the demonstration aircraft of the Red Arrows aerobatic display team between 1964, when the team was formed, and 1979, when it was replaced by the Hawk.
When the RAF sold off its Gnats, many were bought by private collectors and some subsequently appeared in the 1991 comedy film Hot Shots!.
ex-RAF Folland Gnat T.1 during a display at Kemble Airport in 2008. This aircraft is painted in the colours of a former RAF display team, the Yellowjacks.

Finland

The Finnish Air Force received the first of its 13 Gnats on 30 July 1958. It was soon found to be a problematic aircraft in service and required a lot of ground maintenance. Finland considered licence manufacturing the aircraft but decided not to. On 31 July 1958, the Finnish Air Force Major Lauri Pekuri broke the sound barrier for the first time in Finland at Lake Luonetjärvi with a Folland Gnat.[7]
All Gnats were grounded on 26 August 1958 for six months after the destruction of GN-102 due to a technical error, and the aircraft soon became the subject of severe criticism. Three other aircraft were also destroyed in other accidents. The Gnats were removed from active service in 1972 when the Häme Wing moved to Rovaniemi, and when the new Saab 35 Drakens were taken into use.

India

Indo-Pakistani War of 1965

Serving primarily with the Indian Air Force, the Gnat is credited by many independent and Indian sources to have shot down seven Pakistani Canadair Sabres (licence-built F-86s) in the 1965 war.[8][9][10] The Pakistan Air Force (PAF) claims only three Gnat victories over F-86s in air to air combat,[11] while two Gnats were downed by PAF fighters. During the initial phase of the 1965 war, an IAF Gnat, piloted by Squadron Leader Brij Pal Singh Sikand, landed at an abandoned Pakistani airstrip at Pasrur and was captured by the PAF. Two Lockheed F-104 Starfighters forced the Gnat down.[12][13] [N 1][14] This Gnat is displayed as a war trophy in the Pakistan Air Force Museum, Karachi. After the ceasefire, one Pakistani Cessna O-1 was shot down on 16 December 1965 by a Gnat.[15]

Bangladesh Liberation War 1971

The Gnats were used again by India in the Bangladesh Liberation War against Pakistan.[16][17] The most notable action was the Battle of Boyra where the first dogfights over East Pakistan (Bangladesh) took place. The IAF Gnats downed two PAF Canadair Sabres in minutes and badly damaged one. The Pakistan Air Force claims that one Gnat was shot down, which was proved incorrect. Another notable dogfight involving a Gnat was over Srinagar airfield where a lone Indian pilot held out against six Sabres,[18] scoring hits on two of the Sabres in the process,[19][20] before being overwhelmed. Gnat pilot Nirmal Jit Singh Sekhon was posthumously honoured with Param Vir Chakra (India's highest gallantry award), becoming the only member of the IAF to be given the award.
By the end of 1971, the Gnat proved to be a frustrating opponent for the technically superior Sabres and had lived up to its Indian Air Force nickname of "Sabre Slayers" since all its combat "kills" during the two wars were against Sabres.[21][22] The Canadair Sabre Mk 6 was widely regarded as the best dogfighter of its era.[8][23][24] Tactics called for Gnats taking on the Sabres in the vertical arena, where the Sabres were at a disadvantage. Moreover, because the Gnat was lightweight and compact in shape, it was hard to see, especially at the low levels where most of the dogfights took place.[10] Apart from air defence operations, the aircraft performed multiple roles in the Bangladesh Liberation War, being used in anti-shipping operations, ground attack, bomber/transport escort and close air support with devastating effects on the PAF.[16][17] The success of the indigenously produced Gnats against the more sophisticated Pakistani-flown aircraft was viewed as a significant achievement.[25]

After 1971

The IAF were impressed by the Gnat's performance in the two wars, but the aircraft had problems including hydraulics and unreliable control systems. To address these issues, the IAF issued a requirement for an improved "Gnat II" in 1972, at first specifying that the new version was to be optimized as an interceptor, but then expanding the specification to include the ground-attack role. Over 175 of the Hindustan Aeronautics Limited-built licenced version, the Ajeet ("Unconquerable"), were produced in Bangalore, while about 40 were purchased directly from Folland.
Gnats served in India from 1958–1978, and several remain in use in private hands. Some IAF Gnats, one of which had participated in the 1971 war in East Pakistan (present day Bangladesh), were presented to the Bangladesh Air Force.[26]

Variants

The third prototype of the Gnat T.1, XM693 at the SBAC show in 1961, showing the short nose of the early aircraft. It now guards the old Folland plant at Hamble, though painted as a Red Arrows aircraft.
  • Fo.141 Gnat : Single seat lightweight fighter aircraft.
    • Gnat F.1 : Single-seat lightweight fighter version for Finland and India. This was also built in India under licence as the HAL Gnat.
    • HAL Ajeet : Single-seat development of the Gnat F.1
    • HAL Ajeet Trainer : Two-seat tandem trainer version for the Indian Air Force. This version was derived from the HAL Ajeet and differed considerably from the Gnat T.1 used by the RAF.
  • Fo.144 Gnat trainer : Two-seat advanced trainer aircraft.
    • Gnat T.1 : Two-seat advanced trainer version for the RAF.

Operators

Folland Gnat with markings of SFR Yugoslav Air Force markings in Belgrade Aviation Museum.
 Finland
 India
A former Red Arrows aircraft, XR537
 United Kingdom
 Yugoslavia
  • SFR Yugoslav Air Force received only two aircraft, construction numbers FL14 and FL17, machines originally marked as G-39-8 and G-39-9 respectively, and became Yugoslav AF inventory registration numbers 11601 and 11602. They were used for evaluation and tests by VOC (Flight test center).

Survivors

Folland Gnat T.1 'XR572/N572XR' in the markings of the RAF Red Arrows at the Jeffco open house in June 2006.
A privately owned Folland Gnat T.1
Private Gnat on display in 2007 showwing nose compartment open
A number of Gnats survive including a number of airworthy examples (particularly in the United States and the United Kingdom) and others on public display:
 Australia
  • Gnat T.1 XS101 is being restored to flying condition in Essendon. Operated by Xjet.
 Finland
 Pakistan
  • One Indian Gnat which was captured by Pakistan Air Force is on display at PAF museum Karachi.
 United Kingdom
 United States
  • Gnat T.1 XM694 (N694XM) is on display at Pima, Arizona.
  • Gnat T.1 XR572 is painted in the markings of the Red Arrows and operates from Rocky Mountain Metropolitan Airport with the US registration 'N572XR'.
  • Gnat T.1 XS105 (N18GT) is on display in flying condition at the Planes of Fame Air Museum, Chino.
 Serbia

Specifications (Gnat F.1)

On the left is the single-seater fighter version of the Gnat. The Gnat trainer on the right was a two-seater aircraft with other modifications.
Data from The Great Book of Fighters[29]
General characteristics
Performance
Armament
  • 2x 30mm ADEN cannons
  • 2x 500 lb (227 kg) bombs or 18x 3 in (76 mm) rockets

Notable appearances in media

The Gnat was the fictional naval fighter flown by the Americans in the 1991 comedy Hot Shots!.[citation needed]

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