Multipurpose Flying Boat
Sea Otter - single-engine amphibious biplane, "Type 309" - development in 1936 by Reginald Mitchell to replace his previous development Walrus in 1933. The main differences of the new flying boat consisted in the transition to an all-metal airframe with a more powerful engine with a pulling propeller instead of a pushing one, mounted on the leading edge of the upper wing. The first flight was on September 23, 1938.
Deliveries of serial machines began in January 1943, in the Royal Air Force in the fall of 1943. Sea Otter was operated in various climatic conditions, which confirmed its good seaworthiness and aerobatic qualities. During search and rescue operations, amphibians, as a rule, worked "in conjunction" with coast-based twin-engined aircraft . The latter, having a longer flight duration, searched for victims, dropping lifeboats and pointing the Sea Otters. Such a scheme, which worked perfectly in the metropolis, turned out to be unsuitable for India: the Warwicks could not be effectively operated in hot and humid climates, unlike the Sea Otters.
As part of the RAF, Sea Otters were used in shore-based auxiliary squadrons that patrolled coastal waters, search and rescue operations, and crew training. In addition to the metropolis, they were based in Ceylon.