Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Sopwith Long Range Tractor Triplane (L.R.T.Tr) was a prototype British long-range three seat triplane escort fighter of the First World War. Of unusual layout, with a small gunner's nacelle mounted on the upper wing to give an all-round field of fire. Only a single example was built, other, smaller, fighters proving more practicable. In early 1916, the British War Office drew up a specification for a multi-seat escort fighter to be powered by one of the new Rolls-Royce Eagle engines, intended to protect formations of bombers from German fighters, with an additional role of destroying enemy airships. While the specification did not require high speed, a good field of fire for its guns was essential, while the secondary anti-Zeppelin role demanded an endurance of at least seven hours.

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