Terne ASW

{{More sources needed|date=May 2017}}

{{Infobox weapon

|is_missile=yes

|name=Terne III Mk8

| image= Terne ASW.jpg

| image_size = 250

|caption= Terne III Mk.8 ASW system opening its clam gate

|origin=

|type=Anti-submarine rocket

|used_by=

|manufacturer=Kongsberg Defence & Aerospace and A/S Raufoss

|unit_cost=

|production_date=1950 (Terne I)

|service=1964

|engine=Solid-fueled Rocket; 52 kN (11700 lb)

|weight=135 kg

|length=1.95 m

|diameter=0.21 m

|wingspan=0.24 m

|speed=

|vehicle_range=425-1600 m

|ceiling=

|altitude=

|filling=50 kg

|guidance=Unguided rocket + depth charge

|detonation=Delay Fuse

|launch_platform=Land and Naval ships

}}

Terne is a Norwegian anti-submarine rocket system, which uses rocket-thrown depth charges. It was developed by the Norwegian Defence Research Establishment (FFI) in cooperation with the U.S. Navy in the late 1940s-early 1960s. The Terne development project consisted of three phases:

Terne I : Development of a rocketborn depth charge.

Terne II: Development and construction of a landbased ASW for naval defense.

Terne III: Development and construction of a shipborne ASW.

A Terne III weapon system consists of a search & track sonar, a fire-control system and the rocket launchers, which can store six salvos of six rockets each. The rocket itself, is a depth charge with multiple fusing modes (preset time after water entry, proximity, or contact), which is propelled through the air by a solid-fueled rocket motor. When the sonar detects a target, the fire-control system can fire a rocket salvo to place a string of depth charges {{convert|18|m|yd|abbr=on}} apart, perpendicular to the target's course.