Gun-launched variable thrust ramjet projectile

Details Gun-launched variable thrust ramjet projectile Gun-launched variable thrust ramjet projectile

1980-12-19

1984-01-31

Tudor, Harold J.

Ammunition and explosives

Having reaction motor

Having pressurization or variable control means for the...

602701, 60917, 244 32T, F42B 1510

Patent

active

044282931

ABSTRACT:
A gun-launched ramjet projectile follows a classical vacuum ballistic trajectory by maintaining a thrust-drag balance. The thrust of the ramjet is varied by an air door which bleeds air from the duct that leads from the supersonic diffuser at the front of the projectile to the combustion chamber. The control system for the air door includes an actuator and a pair of accelerometers, the output of which is integrated to provide an indication of velocity. The first accelerometer operates during the launching of the projectile in the gun to measure the launch velocity. A second, and more sensitive, accelerometer measures in-flight velocity changes due to atmospheric conditions. Both of the measured velocities are compared with prerecorded standards and error signals are derived representing any velocity deviations. These error signals are combined and then used to drive the air doors which varies the thrust of the ramjet so that it follows the classical vacuum ballistic trajectory.

REFERENCES:
patent: 2504648 (1950-04-01), Chandler
patent: 2624281 (1953-01-01), McNally
patent: 2989922 (1961-06-01), Greenwood
patent: 2995893 (1961-08-01), Morris et al.
patent: 3002340 (1961-10-01), Landerman
patent: 3188019 (1965-06-01), Boutin
patent: 3208383 (1965-09-01), Larson
patent: 4291533 (1981-09-01), Dugger et al.

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