Inertial System

Technical Information

Catalogue No: C0084
Category: Navigation/Inertial
Object Type: Sensor/Transducer
Object Name: Inertial System
Part No: A5173 410600
Serial No: 014/82
Manufacturer: Marconi Avionics
Division: Guidance Systems [GSD]
Platform(s): Sting Ray Torpedo 
Year of Manufacture: circa 1982
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Archive Object Store

Marconi Avionics Ltd.
Drg No A5173 410600
Ser No 014/82


In 1965 a funded contract was awarded by the Admiralty Underwater Weapons Establishment to investigate solutions to building a ruggedised Attitude Sensor Unit (or later called a Control Sensor Unit) for a projected new lightweight Torpedo which became Sting Ray. The unit was required to withstand 150g shock. The Company Research Lab. (FARL) developed a strapdown system using simple rate gyros and accelerometers with all electronic computation (initially analogue computing was used). The ASU is an advanced, strapped-down attitude sensing and control unit with basic advantages over contemporary torpedo sensing and control systems The unit is small, light, very rugged, inherently drift free and apart from the basic transducers the ASU is all solid state.
The ASU is inherently flexible and with minor variations can be applied in many types of underwater weapons.

The first trial took place in 1966 in a van at West Malling Airfield using an E3 Platform as a reference. In 1967 the system was brought into production by the then Gyro Division and the Sting Ray Torpedo entered service in 1983.

This unit has a clear plastic cover that permits a view of its internal construction. It is missing its pressure sensor (see the related unit).

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