Lockheed DP-2H Neptune

The Lockheed DP‑2H Neptune, a maritime patrol and anti‑submarine warfare aircraft, entered service in the early 1940s as a critical component of the United States Navy’s effort to protect sea lanes during World War II. Developed by the Lockheed Corporation from the earlier P‑2 series, the DP‑2H incorporated a larger wingspan, reinforced airframe, and upgraded avionics that allowed for extended range and improved low‑altitude handling over open ocean. Powered by twin Wright R‑1820 radial engines, the aircraft could cruise for more than 3,500 nautical miles, enabling continuous patrols across the Atlantic and Pacific theaters. Its suite of sensors—including magnetic anomaly detectors, sonobuoys, and a powerful radar—made it a versatile platform for locating enemy submarines and surface ships. The DP‑2H also featured a spacious bomb bay capable of carrying depth charges, torpedoes, and later, early guided munitions. After the war, the Neptune helped shape post‑war maritime patrol doctrine and served as a testbed for emerging electronic warfare technologies. Its legacy endures as a bridge between piston‑engine patrol boats and the jet‑powered maritime aircraft that dominate modern naval aviation.

Lockheed Corporation

Lockheed DP-2H Neptune

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