Thank you to the original Bohemian Eagle, The Mighty Jingles, for sharing his experience while writing this Ship Brief in 2023. He was a great help. Any mistakes in this video are my own and not a reflection of Mr. Jingles knowledge and experience.
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VERY IMPORTANT NOTE The SEA DART missile system was initially semi-active homing. An upgrade made it a 'more autonomous' active homing. Thus SEA DART was both Semi-active homing and Active homing in it's life time.

The HMS Sheffield (D80) was a Type 42 (Sheffield class) destroyer in the Royal Navy, commissioned in 1975. This warship was among the first of its class, designed primarily for area air-defense to protect carrier battle groups from aerial threats, including low-flying aircraft and anti-ship missiles.

Technical Specifications:
HMS Sheffield
Propulsion: It was powered by COGOG (Combined Gas or Gas) propulsion systems, consisting of two Rolls-Royce Olympus TM3B high-speed gas turbines for high-speed operations and two Rolls-Royce Tyne RM1A cruising gas turbines, generating a combined output of about 36,000 horsepower. This setup allowed the ship to operate more efficiently at different speed ranges, with a top speed of over 30 knots.
Armament: The primary armament of the HMS Sheffield included a twin Sea Dart missile launcher, capable of engaging aerial targets at long ranges. It also featured one 4.5-inch Mark 8 naval gun for surface targets, two 20 mm Oerlikon cannons, and two Phalanx CIWS (Close-In Weapon Systems) for last-minute defense against incoming missiles.
Electronics: The ship was equipped with a sophisticated suite of sensors and radars, including the Type 1022 long-range air search radar, Type 996 3D surveillance radar, and Type 909 fire control radar for the Sea Dart missiles. It also had sonar equipment for anti-submarine operations.
Aircraft: The destroyer had facilities to operate one Lynx helicopter, enhancing its capability in anti-submarine warfare and surface warfare operations.

Operational History:
The HMS Sheffield gained historical significance during the Falklands War in 1982. It was tragically hit by an Exocet missile fired by Argentine forces, leading to severe damage and the loss of 20 crew members. This incident underscored the vulnerability of modern warships to missile attacks and led to significant changes in naval tactics and defense systems.

The Sea Dart missile
Key Components and Functionality:
Missile Design: The Sea Dart missile was typically about 4.4 meters in length, with a wingspan of around 1 meter. It was equipped with a solid rocket booster for initial launch and a ramjet sustainer motor for flight. This design allowed the missile to accelerate to speeds over Mach 2.
Guidance System: Initially, Sea Dart missiles used semi-active radar homing for guidance. This required the ship's radar to illuminate the target until the missile impacted. The system was later updated to include a more autonomous active radar homing capability, allowing greater flexibility and the ability to engage multiple targets simultaneously.
Warhead: The missile was armed with a high-explosive blast fragmentation warhead, triggered by a proximity fuse. This was designed to detonate near the target, maximizing the likelihood of destroying or disabling it through shrapnel.
The missile system operated by first detecting and tracking targets using the ship's radar systems. Once a target was identified and within range, the Sea Dart could be launched. After launch, the missile's booster would activate, propelling it away from the ship and towards the target. Upon booster burnout, the ramjet would take over, maintaining high speed as the missile approached the target area.

During its terminal phase, the guidance system would home in on the radar reflections from the target, guided by the ship's radar or its own onboard radar in later versions. The proximity fuse would detect the optimal moment to detonate the warhead, intending to destroy or incapacitate the target with a blast and shrapnel.

Historical Context and Legacy:
The Sea Dart proved its effectiveness during the Falklands War, where it was credited with several Argentine aircraft kills. However, its performance also highlighted some limitations in cluttered environments or against low-flying targets. These operational experiences helped inform subsequent developments in naval air defense systems, aiming to address these shortcomings.

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