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. 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.
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.
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.
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.
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. 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.