Wright Model C
[1] Aerodynamically, the small finlets ("blinkers" in the Wrights' terminology) that had been used on the Model B's undercarriage were replaced by two vertical vanes attached to the forward end of the skids.The increase in power was to meet Army specifications that the aircraft have a rate of climb of 200 feet per minute (1 m/s), a fuel capacity for a four-hour flight, and carry a weight of 450 pounds including crew.Its simplified twin-lever control system was confusing to operate and proved difficult for novice pilots to master, while the plane itself was tail heavy and unstable.An Army board of investigation concluded that the elevator was "too weak" and that the Model C itself was "dynamically unsuited for flying," despite testimony from Wright's chief instructor that poor maintenance played a key role in the fatalities.5 (a Burgess F rebuilt to Model C configuration), permanently discontinued on February 24, 1914, when on Loening's recommendation the Army de-commissioned all seven of its remaining "pusher" airplanes as a matter of policy.