"1"^^ . "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."@en . . . .