UGM-84 Harpoon

UGM-84 Harpoon. The UGM-84 Harpoon is the submarine-launched variant of the Harpoon family of all-weather, over-the-horizon anti-ship missiles. Developed by McDonnell Douglas (now part of Boeing Defense, Space & Security), it entered service with the United States Navy in 1981, providing a critical long-range standoff capability for submerged attack submarines. The missile is designed to execute sea-skimming flight profiles to evade enemy defenses before striking surface combatants with a high-explosive penetrator warhead.

Development and design

The development of the UGM-84 was initiated to equip the United States Navy's submarine force with a potent anti-ship weapon, complementing existing surface and air-launched Harpoon variants. Engineers at McDonnell Douglas adapted the basic Harpoon airframe and guidance system for encapsulation within a buoyant launch canister, enabling discharge from a submarine's standard torpedo tube. Following launch, the canister ascends to the surface, the nose cap is jettisoned, and the solid-fuel rocket booster ignites, propelling the missile into flight before the Teledyne CAE J402 turbojet sustains its high-subsonic cruise. The guidance system integrates a honeywell strapdown inertial navigation system for mid-course navigation, with terminal attack guided by an active radar seeker derived from that used in the AGM-84 Harpoon.

Operational history

The UGM-84 Harpoon achieved initial operational capability aboard Sturgeon-class submarines and later was integrated into platforms like the Los Angeles-class submarine. While specific combat use by the United States Navy remains classified, the weapon system has been a cornerstone of American undersea warfare strategy, particularly during the Cold War for countering the surface fleet of the Soviet Navy. Allied operators have deployed the missile in various exercises and regional patrols, demonstrating its deterrent value. The system's operational concept was validated during major naval exercises like RIMPAC, often simulating engagements against fleets from nations such as the People's Liberation Army Navy.

Variants

The primary variants are distinguished by block upgrades that enhance range, guidance, and target selectivity. The original UGM-84A (Block 1A) had a range of approximately 75 nautical miles. The UGM-84C (Block 1B) introduced improved seeker performance. The most significant advance came with the UGM-84L (Block II), which incorporated GPS-aided inertial navigation system guidance from a honeywell reference set, enabling precise navigation over land for littoral attacks and countering coastal defense ships. Proposals for a next-generation Block III variant, which would have featured a two-way data link and enhanced targeting, were ultimately canceled in favor of the Long Range Anti-Ship Missile program.

Operators

The primary operator is the United States Navy, which has equipped several classes of submarines. Key international customers for the UGM-84 and its variants have included the Royal Australian Navy for its Collins-class submarines, the Republic of Korea Navy, the Royal Netherlands Navy, and the Spanish Navy. Other historical operators have included the Royal Navy and the Canadian Armed Forces, though some have since retired the capability. Sales and transfers are typically managed through the Foreign Military Sales program of the United States Department of Defense.

Specifications

The UGM-84 Harpoon is approximately 12.6 feet (3.8 m) long, weighs 1,523 pounds (691 kg), and has a diameter of 13.5 inches (34 cm). Propulsion is provided by a solid-propellant rocket booster and a sustaining Teledyne CAE J402 turbojet engine, enabling speeds around Mach 0.71. Operational range exceeds 150 nautical miles (280 km) for later blocks. It carries a 488-pound (221 kg) blast-penetration warhead. Guidance is via a honeywell-built inertial navigation system updated by GPS in Block II variants, with terminal phase targeting handled by an active radar seeker. The launch system is compatible with standard 21-inch torpedo tubes on submarines.

Category:Anti-ship missiles of the United States Category:Submarine-launched missiles Category:Boeing defense products