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Published online by Cambridge University Press: 04 July 2016
Solid propellant rockets are now being used in vehicles whose flight paths are mostly outside the atmosphere and need close control. Engines for such vehicles must not simply provide accelerating thrust but should also be capable of having the direction, magnitude and duration of this thrust altered at will. Some devices and methods for accomplishing such control have been described elsewhere, see Refs. 1, 2, 3 and 4. I shall attempt both to discuss these in more detail and to introduce others which I believe have not yet been mentioned.