Blackburn Perth

The Blackburn Perth was a British flying boat that served during the interwar period. It was essentially an upgraded Iris, and it was the largest flying boat to serve with the Royal Air Force at the time, as well as the largest biplane flying boat ever to serve with the RAF. It replaced the Rolls-Royce Condor engines of the Iris with more powerful Rolls-Royce Buzzards and had an enclosed cockpit for the pilots. Unusually, the Perth carried a Coventry Ordnance Works 37 mm autocannon in its bows in addition to its standard armament. Four Perths were ordered, and the type entered service in January 1934 when the second aircraft was delivered to No. 209 Squadron at RAF Mount Batten, Plymouth.