Surface-search radar gives helicopters an airborne-warning path

Wartime surface-search radar could become a standard helicopter fit because convoy patrols need to find surfaced submarines beyond visual range. An enclosed cabin protects operators and electronics from weather better than an open Swordfish, while a larger aircraft can carry a dedicated operator. Once surface search is routine, experiments with detecting aircraft create an earlier path toward airborne warning, although one set may not perform both roles equally well. The modern Crowsnest example shows that transferring a radar installation from Sea King to Merlin also entails electronics changes and demanding integration work. More frequent helicopter use would generate further ideas for sensors and missions.