Short Knuckleduster

The Short R.24/31 (or Short S.18 and nicknamed the Knuckleduster) was a British twin-engined, high-wing cantilever gull winged monoplane flying-boat designed and built by Short to Air Ministry specification R.24/31 for a "General Purpose Open Sea Patrol Flying Boat". The contract also specified the use of the experimental Rolls-Royce Goshawk engine. The Saunders-Roe London and the Supermarine Stranraer competed successfully for this contract.

R.24/31 (S.18 Knuckleduster)
Short S.18 'Knuckleduster' (K3574), at Felixstowe, 1934
Role General purpose flying-boat
Manufacturer Short Brothers
Designer (Sir) Arthur Gouge
First flight 30 November 1933
Retired 1938
Status Prototype
Primary users Short Brothers
Marine Aircraft Experimental Establishment (MAEE), Felixstowe
Produced Rochester
Number built 1

Although it never saw military service, the Knuckleduster provided useful information on the steam-cooling of engines and the handling of monoplane flying-boats; much experimental data gathered contributed to the design of the successful Empire and Short Sunderland aircraft.

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