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The four prototypes and first production batch of six aircraft were built at Cricklewood with the first aircraft delivered by road to Hendon on 9 December 1915. The first flight of the first prototype, serial number 1455, was made at Hendon on 17 December 1915 when a short straight flight was made, the aircraft taking off without trouble at 50 mph (80 km/h). A second flight was made the following day, when it was found that the aircraft would not fly faster than about 55 mph (89 km/h). This was blamed on the drag caused by large honeycomb radiators, which were changed for tube radiators mounted either side of the engine nacelles. A third flight on 31 December revealed a number of control problems: ailerons and elevators were effective but heavy, partly due to excessive friction in the control circuit, and the rudders were seriously overbalanced.  After minor modifications to address these issues the aircraft was flown to RNAS Eastchurch, where full-speed trials were made. However on reaching 70 mph (110 km/h) the tail unit began to vibrate and twist violently: the pilot immediately landed, and an inspection showed severe damage to the rear fuselage structure. Reinforcement failed to cure the problem. The enclosed cockpit and most of the armour plating were also removed (wiki)