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Inertial Platform

Technical Information

Catalogue No: C0082
Category: Navigation/Inertial
Object Type: Sensor/Transducer
Object Name: Inertial Platform
Part No: E3R
Serial No: 001
Manufacturer: Elliott Bros
Division: Unknown
Platform(s): Jaguar 
Year of Manufacture: Unknown
Dimensions:
Width (mm):
382 
Height (mm):
260 
Depth (mm):
308 
Weight (g):
23,600 
Location: Archive Object Store
Inscription(s):

Elliott
Inertial Platform
Type No. E3R
Ref No. Model
Serial No. 001

Notes:

This unit is identified as ‘Inertial Platform E3R Model’ but it is not a Model and appears to be a working unit and is probably a prototype.

In an attempt to make use of the experience gained in the 1960’s designing the inertial navigator for the ‘Blue Steel' air-to-surface missile the Company embarked on the development of a general-purpose instru­ment for aircraft navigation, and an experimental stable platform, E5 was built. This project was not completed, as it was realised that the platform was likely to be too bulky for many applications, and improvements in technique appeared to offer scope for a reduction in size. A project to develop a new platform was commenced in the Company Research Laboratory, FARL, where fortuitously the majority of the small team of engineers had been in the Inertial Navigation Division including the Chief Engineer 'Dick' Collinson and the Chief Designer 'Staff' Ellis. FARL produced the E3 stable platform, using a novel gimbal system which permitted a very compact construction.  A trial of this platform was madse in early 1963 at Cranfield with the E3 Platform mounted under the canopy of a Gloster Javaelin. This design entered production for the Hawker Siddeley Aviation HS801 'Nimrod' maritime strike and reconnaissance aircraft and between 1964 and 1970 over 100 platforms were delivered.

However  a further development of the E-3 platform, the E-3R which permitted a wider range of manoeuvre, was specified for the BAC/Breguet  'Jaguar' fighter, and entered service in 1970 rapidly becoming an industry standard. The E3-R had a fourth gimbal and incorporated continuous rotation of the two vertical gyros and horizontal accelerometers to achieve 'rotaional averaging' giving greatly increased accuracy.

The Jaguar Navigation and Weapon Aiming Sub-System NAVWASS  comprised the MCS920M central digital computer, E3R inertial platform, projected map display and horizontal situation indicator together with the necessary power supply, electronic, interface and control units.

 

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