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Blackburn Perth : ウィキペディア英語版 | Blackburn Perth
The Blackburn Perth was a British flying-boat during the inter-war period. It was essentially an upgraded Iris, hence the largest flying-boat to serve with the Royal Air Force at the time (and the largest biplane flying boat ever to serve with the RAF). ==Design and development== The Blackburn R.B.3A Perth was designed as a replacement for the earlier Iris to Air Ministry Specification 20/32. Developed from the Iris Mk. V, the Perth first flew in 1933. It differed from the Iris by replacing the Rolls-Royce Condor engines of the Iris by more powerful Rolls-Royce Buzzards and having an enclosed cockpit for the pilots. Unusually, in addition to its normal armament, the Perth was fitted with a Coventry Ordnance Works C.O.W 37 mm (1.46 in) autocannon in its bows.〔("C.O.W. 37mm cannon fitted to Blackburn Perth flying boat", ''YouTube'' )〕 Four Perths were ordered for service for the RAF.〔 〕
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