Construction was primarily in wood with conventional biplane strut-braced wings and a monocoque fuselage built up from ply veneers. The monocoque construction gave a large open space within the fuselage. The pilots were situated in the nose, with a partition separating them from the engineer's station and the engine controls mounted on either side of the opening in the partition. The fuel tanks were in the top and sides of the fuselage to maintain the clear internal space.
The original design was to be powered by four 600hp Siddeley Tigers, arranged in tandem pusher/tractor pairs at midgap. It soon became evident, however, that the Tiger would not be ready in the timespan required so in order to maintain a comparable power/weight ratio, Tarrant elected to fit six 450hp Napier Lions instead, at the same time adding an upper, third wing with the same dimensions and structure as those of the bottom wing, transferring the support for what became the central wing's large overhang to the top wing. The two additional Lion tractor engines were mounted directly above the lower pairs.
The fuselage was a finely-streamlined, cigar-shaped structure which carried a biplane tail unit, comprising two tailplanes, the lower of which incorporated a horn-balanced elevator, and the upper a trimming surface operated by handwheel in the pilot's cockpit. A second elevator was mounted in the tailplane gap.
The landing gear was huge, as you can see, with each wheel assembly being attached by struts designed to distribute landing loads equally to the three wings.
Work on the aircraft briefly stopped at the end of the War, when it was no longer needed as a bomber. The design was altered to allow it to be used as a commercial or transport aircraft and construction resumed.
The Tabor was readied for its maiden flight from the Royal Aircraft Establishment at Farnborough on 26 May, 1919. With two pilots and five passengers the plane was taxied around the landing field using only the four lower engines. Satisfied with the behaviour of the aircraft the crew decided to take-off. The tail was off the ground but it was still running on the main wheels, intermittently lifting off.
When the pilots brought both of the upper engines to full power the aircraft pitched forward, causing the aircraft to nose over into the ground and to inflict fatal injuries on both men.
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