Design and Development
Designed by R. J. Mitchell as a tender to Air Ministry R.24/31 Specification for a coastal reconnaissance flying boat for the RAF, it was initially turned down but Supermarine proceeded with the type as a private venture first known as the Southampton V. A contract was placed in 1933 for a prototype powered by two 820 hp (611 kW) Bristol Pegasus IIIM and the type became known as the Stranraer.
The structure was mainly duralumin, with the hull covered with sheet metal and the wings with fabric.
Following the initial flight-test programme, the Stranraer prototype (K3973) on 24 October 1934 was delivered to the RAF. On 29 August 1935, an initial order was placed for 17 aircraft (serial numbers K7287 to K7303) to the Air Ministry Specification 17/35. The production version was fitted with the 920 hp (686 kW) Pegasus X and first flew in December 1936, entering service operations on 16 April 1937; the last Stranraer was delivered 3 April 1939. An additional order for six aircraft (K9676 to K9681) was placed in May 1936, but subsequently cancelled. A total of 40 Stranraers were built in Canada by Canadian Vickers Limited; Supermarine and Canadian Vickers being subsidiaries of Vickers-Armstrongs.
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