Britain, too, gained its first triplane bomber in 1917 with the single-engined Sopwith Rhino. It was not a success and the Sopwith Cobham, the only twin-engined type that Sopwith ever produced, fared little better two years later. From 1918, the British company Bristol developed a series of heavy triplanes which, like the Caproni design, appeared in different variants aimed at different roles. The first was the Bristol Braemar bomber, flying in 1918 with the Mk II version in 1919. The Bristol Pullman 14-seat transport variant flew in 1920. This was followed by two examples of a new, larger design for a military freighter known as the Bristol Tramp. The Tarrant Tabor, another and much larger British bomber, was built with three wings to carry the six engines required—four more-powerful engines being unavailable. The power imbalance due to the high mounting caused the Tabor to crash on its maiden flight in 1919. Its designer Walter Barling went on to design the similar-sized American Witteman-Lewis XNBL-1 triplane, known as the "Barling Bomber", which first flew in 1923. On a smaller scale, the Avro 547 airliner was a modified Avro 504 with an extra wing. Two were built, of which the first flew in 1920. It was sold to Queensland and Northern Territory Aerial Services but proved unsuited to the tough conditions in the Australian Outback. Britain's only triplane contribution to the maritime arena was the Felixstowe Fury prototype of 1918, also known as the Porte Super-Baby.