Engineering:Vickers Valetta

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Short description: British military transport aircraft, 1947
Valetta
Vickers Valetta.jpg
Role Military transport aircraft
Manufacturer Vickers-Armstrongs Ltd
First flight 30 June 1947
Primary user Royal Air Force
Number built 262
Developed from Vickers VC.1 Viking
Variants Vickers Varsity

The Vickers Valetta is a twin-engine military transport aircraft developed and produced by the British manufacturing company Vickers-Armstrongs Ltd. Developed from the Vickers VC.1 Viking compact civil airliner, it was an all-metal mid-wing monoplane with a tailwheel undercarriage.

Development of the Valetta commenced during immediate postwar years as a consequence of Royal Air Force (RAF) interest in a military transport model of the Viking. Amongst the requirements stipulated for the aircraft was the need for it to rapidly alternate between various different roles, including that of a troop transport, air ambulance, freighter, glider tug and paratroop carrier. To accommodate these various roles, many of the aircraft's furnishings were designed to be rapidly removed and replaced by alternative configurations. Further design changes from the Viking included the adoption of more powerful Bristol Hercules 230 radial engines, a reinforced cabin floor and a strengthened undercarriage.

Having performed its maiden flight on 30 June 1947, the Valetta was quickly introduced to RAF service during the following year. The type promptly became a major element of Transport Command's activities and participated in various British military operations conducted during the 1950s and 1960s, including the Suez Crisis, Aden, and the Malayan Emergency. It was further developed into multiple variants, including a VIP model, and multiple training models. Most extensively, the Valetta was the basis for the Vickers Varsity, a dedicated military trainer aircraft.

Development

Background

The origins of the Valetta are closely associated with the aircraft from which it was derived from, the Vickers VC.1 Viking, a civil-orientated airliner which had in turn been derived from the Second World War-era Vickers Wellington medium bomber.[1] During the latter stages of the Viking's development, it underwent extensive evaluations by the Royal Air Force (RAF). Several officials took an interest in seeing the type procured as a dedicated military transport variant with which to equip RAF Transport Command, using the aircraft as a quick replacement for numerous worn-out transport aircraft that had served in the Second World War.[2]

It was on the basis of this interest that the Air Ministry decided to formalise the requirement, issuing Specification C.9/46 with Vicker's design specifically in mind. The aviation author C. F. Andrews observed that the specification was relatively forward-looking for the era, particularly as it required the aircraft to be rapidly convertible for performing various roles, including as a troop carrier, air ambulance, freighter, glider tug, and for air-dropping both paratroopers and supplies.[2]

Into flight

The first prototype Valetta, which had originally been built as a standard Viking (c/n 158), was completed during the first half of 1947. On 30 June 1947, this prototype performed the type's maiden flight from Brooklands, piloted by Vicker's test pilot Mutt Summers.[3][4]

Although the Valetta was named after the Maltese capital Valletta, the aircraft's name is spelt with only a single "l". The Viking and Valetta provided the basis of the Varsity. The Varsity, although similar, was slightly larger and had a tricycle undercarriage arrangement and was equipped with a distinctive under-fuselage pannier for accommodating a bomb-aimer and up to 24 practice bombs.[5]

Design

The Vickers Valetta was a twin-engine military transport aircraft. The fundamental differences between the Valetta and its Viking predecessor consisted of the fitting of more powerful engines, the installation of a strengthened cabin floor and the presence of a sizable pair of reinforced double-doors on the side of the fuselage for loading and unloading cargoes.[6][2] The use of more powerful engines was largely necessitated by the aircraft's roughly 2,000 lb increase in all-up weight over that of the Viking. The engines fitted to the Valetta were a pair of Bristol Hercules 230 radial engines, each capable of providing up to 2,000 hp.[3]

To best accommodate its use as a transport aircraft, Valetta was designed to accommodate various-sized military cargoes, even relatively bulky ones; thus the interior floor was designed to support as much as 1,500 lb being exerted upon any single focused point of contact; this floor was lined with anchoring points from which to secure cargoes to.[2] Furthermore, many of the interior furnishings were designed to be quickly-removable, enabling the aircraft to quickly be converted between roles; these furnishings included multiple styles of seating, a loading winch, vehicle ramps, floor rollers, glider-towing apparatus, additional fuel tanks, and side-wall soundproofing measures.[7] As a troop transport, up to 34 fully-equipped soldiers could be carried by a single Valetta, while up to 20 stretcher-bound personnel, along with two medical attendants, could be transported in the air ambulance layout; the paratroop configuration accommodated as maximum of 20 paratroopers along with nine 350 lb air-droppable supply containers.[8]

Several external provisions for handling various payloads were present, such as the carriable of supply containers upon twin racks installed under the centre fuselage.[8] To enable gliders to be towed, the rear fuselage featured a pyramid-shaped structure that was used for the anchoring point and release mechanism alike. For extended range operations, optional flexible bag-like tanks could be installed. To accommodate higher weight payloads that had been anticipated in the Viking's operations and to better withstand rougher landings, the undercarriage was reinforced considerably.[9]

Operational history

During 1948, the Valetta C.1 entered service with the RAF. Its arrival in quantity led to the rapid replacement of the wartime Douglas Dakotas within RAF Transport Command, including the numerous transport squadrons stationed across the Middle East and Far East.[4] The Valetta was used over active conflict zones, such as to perform numerous parachute drops over Egypt during the 1956 Suez Crisis.[10] The type was frequently in its transport capacity to support a number of other British military operations throughout the 1950s and 1960s, including during the Malayan Emergency,[11] and Aden.[12][3]

Vickers Valetta T.3 of the RAF College at Blackbushe airport in September 1956. Note the cabin-top astrodomes and aerials for navigational training
Valetta T.4 of No.2 ANS with extended radar nose

While the vast majority of Valettas were of the C.1 standard, there were several specialised variants inducted as well. The Valetta C.2 was a dedicated VIP passenger transport, its performance was largely similar save for its extended range capabilities.[13][3]

The Valetta T.3 was built to provide a navigational trainer for service with the RAF College at RAF Cranwell and with No.1 and No.2 Air Navigation Schools. They could be visually distinguished from prior variants by the presence of numerous astrodomes across the top of its fuselage.[3] 40 aircraft were delivered from August 1951, with the last being WJ487 in September 1952. A total of 18 Valetta T.3s were subsequently converted to the T.4 standard, which featured an enlarged nose that accommodate a radar unit, enabling the model to be used for the training of personnel in the Airborne Interception (AI) role.[14][15]

Several individual Valettas were modified under various experimental programmes performed by Vickers.[15] Various alternative undercarriages were trialled, although these reportedly displayed little change in ground handling performance when compared against the standard configuration.[15]

Variants

  • Valetta C.1 - transport, 211 built
  • Valetta C.2 - VIP transport, 11 built
  • Valetta T.3 - aircrew trainer, 40 built.[3]
  • Valetta T.4 - converted from T.3 with radar fitted in nose.[16][15]

Operators

 United Kingdom
  • Royal Air Force
    • No. 30 Squadron RAF
    • No. 48 Squadron RAF
    • No. 52 Squadron RAF
    • No. 70 Squadron RAF
    • No. 78 Squadron RAF
    • No. 84 Squadron RAF
    • No. 110 Squadron RAF
    • No. 114 Squadron RAF
    • No. 115 Squadron RAF
    • No. 167 Squadron RAF
    • No. 173 Squadron RAF
    • No. 187 Squadron RAF
    • No. 204 Squadron RAF
    • No. 215 Squadron RAF
    • No. 216 Squadron RAF
    • No. 233 Squadron RAF
    • No. 622 Squadron RAF
    • No. 683 Squadron RAF
    • RAF College
    • No. 1 Air Navigation School
    • No. 2 Air Navigation School

Accidents and incidents

  • On 18 February 1951, an RAF Valetta made a forced belly landing near Stockholm-Bromma Airport following the failure of one engine and radio problems. Airframe icing compounded the situation. Of the 22 passengers and crew, one person was killed. The aircraft was totally destroyed.[citation needed]
  • On 15 January 1953, Valetta C.1 VX562 collided in mid-air over the Mediterranean Sea with a RAF Lancaster, all 19 on the Valetta and seven Lancaster crew were killed.[17]
  • On 11 November 1953, VX490 disappeared while on air test after departing RAF Changi. All 7 on board died. It is thought the plane broke up in a thunderstorm.[citation needed]
  • On 6 January 1954, Valetta T.3 WJ474 crashed near Aldbury, Hertfordshire on takeoff in bad weather from RAF Bovingdon. The aircraft was carrying a rugby team, and 17 on board were killed, with one survivor.[18][19]
  • On 21 February 1954, Valetta C.1 WJ494 Inbound from Hong Kong, crashed 2.4 km (1.5 mi) from Singapore's Changi RAF base during a single engine approach. It was alleged that the pilot feathered the wrong faulty engine whilst approaching the runway. The aircraft lost height and hit trees, bursting into flames; of the twelve occupants, three lost their lives.[20]
  • On 17 April 1957, Valetta C.1 VW832 crashed at Queria, Jordan, five minutes after taking off from King Hussein International Airport, when the left wing separated after encountering turbulence. All 26 people on board were killed.[21]
  • On 22 August 1957, RAF Valetta VX491 'Y' crashed in the jungle near Tanjong Malim, Malaya. Three RAF crewmen were killed, four 55 Coy RASC AD servicemen survived and were rescued Possible cause - engine failure.[citation needed]

Aircraft on display

A Valetta C.2 preserved at the Norfolk and Suffolk Aviation Museum
  • A Valetta T.3 cockpit is displayed at the South Yorkshire Aircraft Museum, Doncaster. While there is no certain identification of the cockpit, it is assumed that it belonged to WJ476.

Specifications (Vickers Valetta C.1)

Data from Vickers Aircraft since 1908[25]

General characteristics

  • Crew: 4
  • Capacity: 34 troops or 20 paratroops[26]
  • Length: 62 ft 11 in (19.18 m)
  • Wingspan: 89 ft 3 in (27.20 m)
  • Height: 19 ft 7 in (5.97 m) (tail down)
  • Wing area: 882 sq ft (81.9 m2)
  • Empty weight: 24,980 lb (11,331 kg)
  • Gross weight: 36,500 lb (16,556 kg)
  • Fuel capacity: 724 imp gal (869 US gal; 3,290 L)[27]
  • Powerplant: 2 × Bristol Hercules 230 14-cylinder radial piston engine, 2,000 hp (1,500 kW) each
  • Propellers: 4-bladed de Havilland (or Rotol) four-bladed constant-speed, 13 ft 3 in (4.04 m) diameter [27]

Performance

  • Maximum speed: 258 mph (415 km/h, 224 kn) at 10,000 ft (3,000 m)
  • Cruise speed: 172 mph (277 km/h, 149 kn) at 10,000 ft (3,000 m)[4][27]
  • Range: 1,460 mi (2,350 km, 1,270 nmi) at 10,000 ft (3,000 m) and 211 mph (183 kn; 340 km/h)
  • Service ceiling: 21,500 ft (6,600 m)
  • Rate of climb: 1,275 ft/min (6.48 m/s)
  • Take-off distance to 50 ft (15 m): 3,750 ft (1,140 m)[27]
  • Landing distance from 50 ft (15 m): 4,275 ft (1,303 m)[27]

Notable appearances in media

A long sequence in the 1957 film High Flight shows the Valetta T3 used as a flying navigation classroom at RAF College Cranwell.[citation needed]

See also

Related development

Aircraft of comparable role, configuration and era

References

Citations

  1. ↑ Andrews 1969, pp. 396, 408.
  2. ↑ 2.0 2.1 2.2 2.3 Andrews 1969, p. 408.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Andrews 1969, p. 411.
  4. ↑ 4.0 4.1 4.2 Thetford 1957, pp. 446–447.
  5. ↑ Andrews 1969, p. 413.
  6. ↑ Donald, David, ed. The Encyclopedia of World Aircraft. London: Aerospace Publishing, 1997. ISBN:1-85605-375-X.
  7. ↑ Andrews 1969, p. 408-410.
  8. ↑ 8.0 8.1 Andrews 1969, p. 410.
  9. ↑ Andrews 1969, pp. 410-411.
  10. ↑ Paul, James Paul and Martin Spirit. "The Last Drop 3 Para at El Gamil airfield." Britain's Small Wars, 2008. Retrieved: 10 April 2007.
  11. ↑ Paul, James Paul and Martin Spirit. "RAF in Malaya." Britain's Small Wars, 2008. Retrieved: 10 April 2007.
  12. ↑ Paul, James Paul and Martin Spirit. "The RAF in Aden and the Radafan." Britain's Small Wars, 2008. Retrieved: 10 April 2007.
  13. ↑ Thetford 1957 (rev 1988), p. 566.
  14. ↑ Martin 1975, pp. 35–37.
  15. ↑ 15.0 15.1 15.2 15.3 Andrews 1969, p. 412.
  16. ↑ Taylor, Michael J.H. Jane's Encyclopedia of Aviation. London: Studio Editions, 1989. ISBN:0-517-10316-8.
  17. ↑ "Accident Description: Valetta C1." aviation-safety.net.
  18. ↑ "Accident Description: Valetta T3." aviation-safety.net.
  19. ↑ Service Aviation Flight 15 January 1954
  20. ↑ "ASN Aircraft accident Vickers Valetta C.1 WJ494 Singapore-Changi RAF Station" aviation-safety.net.
  21. ↑ "ASN Aircraft accident Vickers Valetta C.1 VW832 Queria" aviation-safety.net.
  22. ↑ "Vickers Viking/Valetta/Varsity". http://www.oldprops.ukhome.net/Viking%20Photographs.htm. 
  23. ↑ "OUR AIRCRAFT". http://www.aviationmuseum.net/ouraircraft.htm. 
  24. ↑ "Valetting the Valetta". http://www.aviationmuseum.net/NewsItems/News_170215.html. 
  25. ↑ Andrews and Morgan 1988, p. 416.
  26. ↑ Andrews and Morgan 1988, p. 411.
  27. ↑ 27.0 27.1 27.2 27.3 27.4 Bridgman 1951, pp. 92c–93c.

Bibliography

  • Andrews, C.F. Vickers Aircraft Since 1908. London: Putnam, 1969.
  • Andrews, C.F. and E.B. Morgan. Vickers Aircraft since 1908. London: Putnam, 1988. ISBN:0-85177-815-1.
  • Bridgman, Leonard. Jane's All the World's Aircraft 1951–52. London: Sampson Low, Marston & Company, Ltd, 1951.
  • Martin, Bernard. The Viking, Valetta and Varsity. Air-Britain (Historians) Ltd. 1975. ISBN:0-85130-038-3.
  • Thetford, Owen. Aircraft of the Royal Air Force 1918-57. London: Putnam, 1st edition, 1957.

External links



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