Editing Supermarine Swift (section)

===Proposed derivative===
{{main|Supermarine 545}}
In 1953, as a response to growing RAF interest in developing [[transonic]] aircraft to serve as a stopgap while the next generation of [[supersonic]] fighters were being developed, both Supermarine and Hawker proposed derivatives of their respective Swift and Hunter aircraft.<ref name = "wood 48 51">Wood 1975, pp. 48–51.</ref> By that time, the shortcomings of the Swift were not yet apparent, which perhaps had allowed Supermarine to gain the RAF's favour for its proposal, designated as the [[Supermarine 545|Type 545]], over the rival [[Hawker Hunter variants#Prototypes|Hawker P.1083]]. The Type 545 had been drawn up to conform with the requirements given by [[List of Air Ministry specifications#Post 1949 Specifications and Air Staff Operational Requirements.2FTargets .28OR.2FASR.2FAST.29|Specification F.105D]]. It was to have been capable of attaining [[Mach number|Mach]] 1.3. powered by an Avon engine, promising superior performance to that of the P.1083.<ref name = "wood 50 51">Wood 1975, pp. 50–51.</ref> The Type 545 bore a resemblance to the Swift, although it was a complete redesign, having an [[area rule|area-rule]]d fuselage and wing changes. In 1955, work on the project was cancelled, in part due to the considerable difficulties experienced with the Swift.<ref name = "wood 51 52">Wood 1975, pp. 51–52.</ref>