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Anti-submarine helicopter, British, 1962-2000 From Wikipedia, the free encyclopedia
The Westland Wasp is a small 1960s British turbine-powered, shipboard anti-submarine helicopter. Produced by Westland Helicopters, it came from the same Saunders-Roe P.531 programme as the British Army Westland Scout, and is based on the earlier piston-engined Saunders-Roe Skeeter. It fulfilled the requirement of the Royal Navy for a helicopter small enough to land on the deck of a frigate and carry a useful load of two homing torpedoes.
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| Wasp | |
|---|---|
.jpg) A Westland Wasp HAS.1 in Royal Navy markings | |
| General information | |
| Type | Helicopter |
| National origin | United Kingdom |
| Manufacturer | Westland Helicopters |
| Primary users | Royal Navy |
| Number built | 133 |
| History | |
| Introduction date | 1963 |
| First flight | 28 October 1962 |
| Retired | 2000 (Royal Malaysian Navy) |
| Developed from | Saro P.531 |
The increasing speed and attack range of the submarine threat, and the increased range at which this threat could be detected, led to a Royal Navy requirement for a "Manned Torpedo-Carrying Helicopter" (MATCH). Contemporary shipboard weapons did not have the necessary range, therefore MATCH was in essence a stand-off weapon with the helicopter carrying the torpedo or other weapon to the target and being instructed when and where to drop it.[1] Unlike the larger Westland Wessex, the Wasp carried no sonar of its own, and was limited strictly to working in partnership with its parent ship, other ships or other anti-submarine warfare (ASW) units.[2]
The first prototype Saro P.531 flew on 20 July 1958,[3] with the prototypes being subject to detailed testing by the Royal Navy, including the evaluation of several undercarriage layouts, before settling on the definitive arrangement. An order for a pre-production batch of two "Sea Scouts" was placed in September 1961. The first flight of the two pre-production Wasp took place on 28 October 1962.[4] Full production soon commenced, 98 in total being procured for the RN. The Wasp was successfully exported to Brazil, the Netherlands, Indonesia, Malaysia, New Zealand and South Africa. 133 aircraft were built in total.[5]
Wasp was essentially a navalised Scout, indeed it was originally to be called the Sea Scout, and differed mainly in design details. It had a unique 4-wheeled castering undercarriage that allowed the aircraft to be manoeuvred on small, pitching flightdecks. The Wasp could use "negative pitch" from the rotor-blades to enable the aircraft to "adhere" to the deck until the lashings were attached. Additional fuel tankage was installed in the cabin floor, and both the tail boom and main rotor blades were foldable to allow stowage in the small hangars fitted to the first generation helicopter-carrying escorts. It was fitted with a winch above the starboard rear door, and also had the capacity to carry underslung loads from the semi-automatic cargo release unit mounted under the fuselage. With a crew of two (Pilot and Missile Aimer/Aircrewman) and the capacity to seat three passengers, Wasp was useful for short-range transport missions, and for casualty evacuation with room for one stretcher fitted across the rear cabin area.
Later modifications included the ability to carry the Nord SS.11 wire-guided missile, with the fitting of the Aimer's sight in the left cockpit roof, and the installation of large inflatable emergency floats in sponsons on either side of the cabin to prevent capsizing of the top-heavy aircraft in the event of ditching. The SS.11 had limited range, targeting small surface targets such as patrol boats or shore positions, and was later replaced by the AS.12, which effectively had double the range.
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The Wasp HAS.1 was introduced to service in the small ships role in 1964, after an intensive period of trials by 700(W) Intensive Flying Trials Unit between June 1963 and March 1964. It served in this primary role with 829 Naval Air Squadron, but also in training units to supply crews for the front line with 706 NAS between 1965 and 1967 and in 703 NAS between 1972 and 1981. Single airframes also served for light liaison duties in the Commando Assault squadrons, 845 NAS and 848 NAS, until 1973. Although effective as a submarine killer, it was best deployed paired with a Wessex HAS.3 submarine hunter. In the late 1970s, the Westland Lynx started to replace the Wasp.
On 25 April 1982 the Argentinian submarine ARA Santa Fe was spotted by a Wessex helicopter from HMS Antrim. The Wessex and a Lynx HAS.2 from HMS Brilliant then attacked it with depth charges, a Mk 46 torpedo, and also strafed it with General Purpose Machine Gun. A Wasp launched from HMS Plymouth and two Wasps launched from HMS Endurance fired AS.12 anti-ship missiles at the submarine, scoring hits. Santa Fe was damaged badly enough to prevent her from submerging. The crew abandoned the submarine at the jetty on South Georgia and surrendered to the British forces, thus becoming the first casualty of the sea war, as well as the first direct engagement by the Royal Navy Task Force.
The last Wasp was withdrawn from service in 1988 when the last of the Type 12 Rothesay-class frigates was decommissioned.
The Wasp came into service with the Royal Malaysian Navy quite late, compared to the other nations who procured the aircraft when it joined the RMN on 8 April 1988. The Wasp had a relatively short career and was phased out ten years later, replaced by the Eurocopter Fennec.
The first four of an eventual nineteen Wasps were purchased by the Royal New Zealand Navy (RNZN) in 1966, being immediately assigned to the new Leander-class frigate, HMNZS Waikato. They fulfilled numerous tasks, as well as taking part in the Armilla Patrol in the Persian Gulf during the 1980s. The Wasps were flown by RNZN pilots but maintained by ground crews of No. 3 Squadron RNZAF.
In 1997, four Wasps performed a flypast marking the arrival of the new Anzac-class frigate, HMNZS Te Kaha.
The Wasp served 32 years with the RNZN, retiring in 1998, the same year HMNZS Waikato, which first operationally deployed the Wasp in New Zealand, was herself decommissioned. They were replaced by the Kaman SH-2 Seasprite as a stopgap until the arrival of their SH-2G(NZ).
With the Royal Netherlands Navy beginning in the late 1960s, after the fire onboard HNLMS Karel Doorman, NATO anti-submarine commitments were taken over by a squadron of Westland Wasp helicopters, operated from six Van Speijk-class anti-submarine frigates. The shore base was at De Kooy Airfield. The Royal Netherlands Navy 860 Naval Air Squadron received 12 Wasp helicopters between November 1966 and June 1967, operated from Van Speijk-class frigates as AH-12As and flown in the ASW role. The last of the Dutch Wasps were withdrawn from service in 1981 when they were replaced by the Westland Lynx.
The Wasp was also in service with the Brazilian, Indonesian, and South African navies. The Indonesian aircraft were all former Dutch aircraft and the last of the type in active service.
The last of the ten surplus Dutch Navy helicopters refurbished by Westland for the Indonesian Navy was grounded in 1998. Flown by 400th Air Squadron (RON 400) from NAS Juanda, when at sea they were embarked upon the Indonesian Navy's ex-Royal Navy Tribal-class and ex-Dutch Navy Van Speijk class frigates.
The Brazilian Navy operated the Wasp as the UH-2 & UH-2A, taking delivery of three new build helicopters in April 1966 and a further seven ex-Royal Navy helicopters in 1977. 1º Esquadrão de Helicópteros de Emprego Geral (HU-1) flew the helicopters from Navy's Gearing and Allen M. Sumner-class destroyers and the Niterói-class frigates.
The South African Navy received their first batch of ten new-build airframes in 1963, followed by the delivery of a second batch of eight from 1973. Only six of this batch were delivered due to the international arms embargo placed on South Africa during the apartheid regime. The Wasps were flown by 22 Flight from Ysterplaat; the unit became 22 Squadron, Maritime Command in 1976. The helicopters were operated from the navy's President-class frigates. The South African Navy also acquired one ex-Bahrain Public Security Force airframe as an instructional airframe to support its Wasp programme. The South African Navy withdrew their last Wasp in 1990.
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A small number of helicopters are still used by the military and technical colleges for maintenance and engineering training.
Data from Westland Aircraft since 1915[27]
General characteristics
Performance
Armament
Related development
Aircraft of comparable role, configuration, and era
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