The Hawker Harrier was a British experimental biplane torpedo bomber aircraft built by Hawker Aircraft to a specification issued in the 1920s for the Royal Air Force.

[1] The Harrier was a two-seat biplane with single-bay wings powered by a geared Bristol Jupiter VIII radial engine.

[2] The prototype Harrier was tested at the Aeroplane and Armament Experimental Establishment (A & AEE) at Martlesham Heath in November 1927, where, while it met the requirements of Specification 23/25 and had satisfactory handling, the geared engine meant that it was underpowered,[2] and it had an inferior bombload to the Hawker Horsley, the aircraft it was meant to replace.

On testing the modified aircraft, however, it was found to still be underpowered, being incapable of taking off with a torpedo, gunner and full fuel load.

[1] Data from Mason, The British Bomber since 1914 [1]General characteristics Performance Armament