A projectile reaction control system includes a nozzle assembly in which the efflux exhausted thereby may be controlled in a continuously variable fashion. In one example control is by means of a slidable piston so that the thrust developed by the nozzle assembly is substantially linearly dependent on the displacement of the piston, whereby the reaction control system may be controlled by an autopilot with little or no modification.
A projectile including a reaction control system, said system including at least one nozzle assembly, said at least one nozzle assembly comprising a housing defining a nozzle outlet means and a bore adjacent said outlet, a piston means located in said bore and movable to open or to close said nozzle outlet means, drive means for moving said piston means and passage means extending through said piston means whereby the pressure at one end of said piston and means is transmitted to the other end thereof.
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