GAM-77/AGM-28 Hound Dog Missile Guidance System
   N5G Stable Platform, shown inverted with a Plexiglas cover to show the stable platform components.  When installed in the missile it was located in the forward end of the warhead bay in the central part of the missile near the USAF star logo. 1.49516908213

Model number: N5G Inertial Navigation System

Date manufactured: 1959-1963

Period/Dates when in use: 1959-1976

Description: The N5G Inertial Guidance System was used by the USAF in the North American/ Autonetics GAM-77/AGM-28 Hound Dog Missile Systems carried by the B52 Bomber It was used from 1959 till the Hound Dog was phased out in 1976. Over 700 Hound Dog Missiles were built, over 100 were flown in development, test and operational readiness flights. The system was controlled by the D9A VERDAN computer one of the first digital & analog airborne transistor/diode computer systems used. It had a rotating disk memory. The guidance systems in the two missiles could be cross compared to each other and to the B52 navigation system. A star tracker was also included in each missile mounting pylon that could be used to refine calibration while in flight.


Item History: The N5G system was based on a guidance system developed for the Navaho X-10 missile which was never produced. Parts of the N5G including the D9A VERDAN Computer went forward to become parts of the Navy SINS navigation for subs. The importance of the Travis Air Museum N5G display is that it is the only GAM-77 Hound Dog missile museum display where the guidance system components are on public view.



Additional Photos:
N5G Stable Platform, shown inverted with a Plexiglas cover to show the stable platform components. When installed in the missile it was located in the forward end of the warhead bay in the central part of the missile near the USAF star logo.
An actual Gam-77 Hound Dog missile, removed from its B-52 supporting pylon, has been painstakingly restored by museum volunteer staff. An N5G inertial navigation system, fitted with a plastic viewing cover, is also on display alongside the missile.

Supporting documentation:
Detailed System Overview: The N5G Inertial Navigation System in the B-52 Hound Dog Missile (1810602 bytes)

Location/Ownership:
Travis Air Museum
Travis Air Museum, Building 80
461 Burgen Blvd.; Travis AFB, CA 94535

For More Information, Contact:
Travis Air Museum
curator@travisairmuseum.org
707-424-5605

Submission authored by:
James E. Noll

P.O. Box 3410
Escondido, CA 92033
jenca@pacbell.net
760-745-7424