it featured a more powerful engine over the wright b, and an endurance of around four hours. still a two-seater, it added a complete second set of controls, meaning that either crew member could operate the aircraft. on some, the lever controls were replaced with two wheels mounted on a single yoke. 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.