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Working of Solid Propellants When an oxidizer and fuel are mixed, we get a viscous substance, which can be baked into rubbery solid material. On igniting this material, it is seen that it burns rapidly producing a large volume of gases, which in turn produces a large amount of thrust. This propellant mixture is called as grain. But the thrust produced by this method will be low. To increase the thrust a hole is made when the propellant is cast. The hole is designed in such a way as to fit the cavity of the rocket. It is called as perforation. By changing the shape and size of the perforation we can control the rate and duration of burning and thus control the thrust. More the thrust required, larger will be the perforation but the fuel will burn for a smaller time. Lesser the thrust required, smaller will be the perforation but the fuel will burn for a very long time. The burning period and the thrust depends upon the type of perforation in the fuel. Let us see the different classifications of solid propellants | ||