In 1914 the Admiralty, alert to the potential for aircraft to enhance operational capability in naval warfare, resolved to develop a depot ship for the transport and servicing of
seaplanes. Working in conjunction with
Murray Sueter and
Cecil Malone of the newly formed
Royal Naval Air Service, Narbeth established the criteria according to which, together with his assistant C. J. W. Hopkins, he evolved the design for the first
Ark Royal. To expedite construction of this vessel, the incomplete hull of a
tramp steamer was purchased; engines were relocated and a bridge built aft, allowing a long and level flight-deck forward with
hangar space below sufficient for ten seaplanes that could be hoisted to and from deck and sea by steam-cranes amidships. The Ark Royal sailed for the
Dardanelles in February 1915 and the first combat mission was flown from her in the same month. While the vessel was under construction, Narbeth also adapted the former
Cunard liner Campania and the
Isle of Man ferry
Ben-my-Chree to carry seaplanes, and the latter relieved Ark Royal in January 1916. By late 1916 it was recognised that aeroplanes had greater capabilities than seaplanes in warfare, that larger and faster carriers were necessary for service in conjunction with fast cruisers, and that on-deck landing of aircraft was feasible if the size of carriers was increased. This was the background to Narbeth’s subsequent carrier-related work, and from 1918 onward he was Chairman of the Joint Technical Committee on Aviation Arrangements in His Majesty’s Ships, coordinating Admiralty and
Air Ministry involvement in the process of carrier evolution. He was responsible for the designs that governed the conversion to carriers of
Argus (purchased as an incomplete passenger ship) and
Eagle (laid down as a battleship), the creation of
Hermes (the first ship designed and built from keel up as an aircraft carrier), the radical reconfiguration of
Furious, and the transformation into carriers of the battlecruisers
Courageous and
Glorious. Experience during some of these projects informed work on the others, and only the conversions of
Argus and
Eagle were completed prior to Narbeth’s retirement in 1923. At various points in the evolutionary process a
flush deck configuration was favoured, but ultimately a design incorporating a single control island on deck was preferred. The decision to site the island on the ship’s
starboard side was taken by Narbeth and this arrangement, initiated in
Eagle, has been perpetuated on virtually every subsequent aircraft carrier, whether British or foreign. In the
1923 New Year Honours Narbeth was made a
CB, the Liverpool
Journal of Commerce asserting that the honour recognised the special esteem in which he was held within the “blue-water Navy” where his labours to minimise the risk of fire at sea had won particular appreciation. In March that year he and Sir Eustace Tennyson-d'Eyncourt jointly presented a paper to the Institute of Naval Architects proposing that the knowledge gained in developing aircraft carriers for defence purposes might well be exploited by building steamships that could carry aircraft and thereby, for example, enable transatlantic mail and passengers to reach
Montreal and
Halifax before the ships arrived at
New York. ==Retirement and death==