HUS-1 Seahorse

The HUS‑1 Seahorse, developed by Sikorsky Aircraft Corporation in the early 1950s, was the first purpose‑built anti‑submarine warfare helicopter for the United States Navy. Its design evolved from the S‑55 platform, incorporating a larger rotor system, reinforced airframe, and amphibious hull that allowed water landings. First flown in 1954, the Seahorse entered service in 1957, replacing older fixed‑wing sonar aircraft and providing the fleet with a mobile, hover‑capable sensor platform. Key features included a powerful Pratt & Whitney R‑1340 radial engine delivering 600 shaft horsepower, a tandem rotor configuration for excellent lift and stability, and a suite of ASW equipment such as dipping sonar, magnetic anomaly detector, and torpedo launch rails. The aircraft’s spacious cabin could also be reconfigured for search‑and‑rescue, utility transport, or medevac missions, making it a versatile asset. Over 200 units were produced, serving not only the US Navy but also allied forces in Japan, Canada, and the United Kingdom. The HUS‑1’s operational success demonstrated the strategic advantage of helicopter‑based maritime patrol, shaping subsequent naval aviation concepts and paving the way for more advanced platforms like the SH‑60 Seahawk.

Sikorsky Aircraft Corporation

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Design & Classification