Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Sopwith 3F.2 Hippo was a prototype British two-seat fighter aircraft of the First World War. It was a single-engined biplane with considerable negative stagger. It was not successful, the already in production Bristol F.2 Fighter being preferred by the Royal Flying Corps. In the summer of 1917, the Sopwith Aviation Company designed a two-seat fighter aircraft, the 3F.2 Hippo, possibly to replace the Sopwith 1 1/2 Strutter in French service. While the British Air Board did not place an order for the Hippo, it did grant Sopwith a licence to allow it to build prototypes as a private venture. The Hippo was designed to give the best possible view to both the pilot and gunner, which dictated the aircraft's configuration. Its two-bay wings had heavy (2 ft 3 in (0.69 m)) negative stagger, with the pilot sitting ahead of the upper wing and the gunner sitting behind the rear spar of the upper wing. The fuselage filled the gap between the wings, with the crews heads level with the upper wing, and cut-outs in the wing's forward and trailing edge for the pilot and gunner respectively.

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