After initial trials the first aircraft was moved to the Marine Aircraft Experimental Station on the Isle of Grain and moored out in rough seas in a destructive test of mooring performance.
The prototype R.B.1, with the designation Iris I, and with the serial number N185, made its maiden flight from Blackburn's factory at Brough on 19 June 1926, being delivered to the Marine Aircraft Experimental Establishment at Felixstowe the next day, being fully tested during July and August.
The aircraft was first flown on 5 January 1925 and delivered to the Marine Aircraft Experimental Establishment at Felixstowe on 14 March, where it was subjected to a series of strenuous tests, including dropping the aircraft onto the water by stalling it at a height of 30 ft (9 m): the aircraft withstood all trials, and after a year an inspection revealed only negligible corrosion.
The A.14 first flew towards the end of 1928 but only reached the Marine Aircraft Experimental Establishment in March 1930.
On 12 June 1934 at the conclusion of test flying the Knuckleduster was flown to Felixstowe for official trials with the Marine Aircraft Experimental Establishment (MAEE).
During 1942, a series of trials by the Marine Aircraft Experimental Establishment (MAEE) was undertaken, determining attitude and stability characteristics of the design.
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