The concept and general arrangement of the Hanley and Hendon Types were followed once again in the Harrow two-seat torpedo carrier, designed to meet Specification 21/23 in competition with the Blackburn Ripon. The prototype, N205, flew on 24th April 1926. Unlike the engine installations of its predecessors, the 530 hp Napier Lion XI of the Harrow did not have a front car-type radiator, but two small side radiators at the rear of the engine bay, and the smooth cowling was faired-off with a large spinner.
The undercarriage spread was much greater than before and the vertical struts were in line with the inner interplane struts. The bracing of the unswept two-bay wing was unusual in that only two centre section struts were employed, in tandem on the fuselage centre line. The now usual assortment of slats and slotted flaps were fitted. The observer sitting behind the pilot again had a Scarff-mounted Lewis gun and in addition a fixed forward firing Vickers gun was fitted on the starboard side of the cockpit.
In the summer of 1928, N205 was converted by the fitting of twin floats, with the lateral bracing going to the inboard interplane struts to allow the torpedo to be slung under the fuselage centre line.
Once again the Blackburn design was chosen for production for the Fleet Air Arm and the second Harrow, N206, may not have been completed.