Thought I'd try for something a bit different, patrol balloons (blimps) from 1914-18
Two type of gondolas, the Type 1 built by Guild Aero and the Type 2 built by Bellsmith Boat Builders. The blimp portion was manufactured by Endricksen Fabrics, the primary maker of the fabric coverings for military aeroplanes at the time.
Guild Aero won the initial contract for the gondolas and based their design on current aeroplanes, but this proved unsuitable because of the cramped conditions for the 2 man crew on extended patrols, sometimes up to 8 hours. As Guild Aero began building more pursuit aircraft and bombers their facilities quickly became overtasked, so the Admiralty re-assigned production of the gondolas to Bellsmith, who redesigned the gondolas to be more boat-like. The increased size permitted more room for the crew, more petrol storage, and the ability to carry a pair of medium sized depth charges or bombs. The increased petrol also extended the endurance up to 10 hours maximum. The Type 1 was fitted with fore and aft pontoons to permit landing on water. This was not needed for the Type 2 as the boat-like gondola permitted this without pontoons. As a general rule, they only landed on water during emergencies however.
The majority of the patrol balloons were used from shore installations, however 2 Mail Packets were converted in late 1915 to carry 2 each and were used as anti-submarine escorts for convoys.
Guild Aero built 18 gondolas, Bellsmith built 46. Endricksen manufactured 64 blimps.
Active service began in march 1915 and lasted throughout the war. After the war they were gradually replaced in the coastal patrol role by fixed wing seaplanes and rigid airships, the last patrol balloon being withdrawn from service in april 1924.
Type 1 is on the left, the Type 2 is on the right