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The empennage consists of a single vertical tail with a hinged rudder.
A detail drawing, which appeared in Flight Magazine in 1920, shows the empennage and tail-float assembly, including the hinged rudder drop-plate.
As usual, the dates are vague, but something between the hinged rudder and an oar fixed at the stern is found in a bas-relief in Winchester Cathedral; it dates from 1180, barely 100 years after the Bayeux Tapestry.
