|Object Name:||GR-H4 Rate Gyro parts in a Display Panel|
|Division:||Guidance Systems [GSD]|
|Year of Manufacture:||Unknown|
|Location:||Archive Object Store|
GR-H4 Rate Gyro
Guidance Systems Division
End Shield Assembly & Flexicircuit
Inner Sleeve Assembly
Flex Lead Ring Assembly
Microsyn Stator Assembly
Torsion Wire Machining Assembly
Microsyn Rotor Stack Assembly
Rotor & Hysteresis Ring Assembly
Microsyn Stack Stator Assembly
Motor Stator Ring Assembly
GR-4H with Optional Sleeved Case
In March 1980 Marconi Avionics completed its 10,000th rate gyroscope, marking 15 years of manufacture which continued further. The GR-H4 rate-gyroscope was built under licence from Northrop, producer of the original version.
Applications of the Marconi Avionics-built gyroscope include the guidance system of Sky Flash, the RAF's most advanced air-to-air missile, and stabilisation of Harrier. Sky Flash can be launched from Phantoms and Tornado.
While building GR-H4s, Marconi Avionics introduced several improvements, independently of Northrop. These included replacement of the steel gyro-casing with one of Monel nickel alloy incorporation of a mu-metal screen to isolate the gyroscope motor's magnetic field; introduction of chemical etching (in place of lapping) to trim the torsion bar; adaption of semiautomatic test equipment and multiple jigging to simplify production. At the same time unit cost was reduced, in real terms, by a factor of almost three.
In 1980 GR-H4 production rate was roughly 100 units a month.
This exhibit is a perspex block containing a breakdown of parts forming the GR-H4 Gyro.