Boulton & Paul P.11/ Type XXI

The Boulton & Paul P.11/ Type XXI was a design for a two-seat amphibian aircraft, produced in response to RAF Specification XXI.

Specification XXI called for a two-seat amphibian that could operate from land bases, from the sea, or from aircraft carriers.

The main evidence for the design comes from Boulton & Paul drawings labelled Type XXI, and the P.11 designation is tentative, and based on a gap in the recorded P numbers.

The P.11 was a two-bay biplane, powered by one 475hp Napier Lion V engine. The crew of two sat just below the upper wing, which was pierced by a circular cut-out and a rear cut-out. Both were intended to improve visibility, and the circular cut out was also the pilot's entrance. The fuselage was also designed to improve visibility, with a hump in the central section. The pilot had a fixed forward firing Vickers gun, the gunner a Lewis gun on a Scarff ring.

Boulton & Paul built a mock-up of the P.11, but the prototype order went to the Fairey Pintail. The Fairey aircraft didn’t enter British service, but three were ordered by the Japanese Navy. 

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How to cite this article: Rickard, J (29 June 2016), Boulton & Paul P.11/ Type XXI , http://www.historyofwar.org/articles/weapons_boulton_paul_P11.html

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