Power plants – Reaction motor – Solid propellant
Patent
1981-05-12
1983-08-09
Croyle, Carlton R.
Power plants
Reaction motor
Solid propellant
F02K 912, F02K 926
Patent
active
043971490
ABSTRACT:
A solid propellant rocket motor devised so as to temporarily increase its thrust at a desired stage of its operation. The motor has a first propellant grain which is fixedly disposed in the combustion chamber and is formed with a hole that intersects an inital burning surface of the grain and a second propellant grain which is slidably and gastightly fitted in the hole of the first grain and is shorter in length than this hole. Initially, the second grain is prevented from moving relative to the first grain by a restraining mechanism including, for example, a plunger protruding into an aft end portion of the aforementioned hole to come into abutment with an end face of the second grain. At a desired moment during operation of the motor, the restraining mechanism can be rendered ineffective by actuating a releasing device, whereby the second grain is forced to move by the combustion gas pressure with the result that an end portion of the inner surface of the first grain defining the hole is exposed and becomes an additional burning surface. Usually the two grains are so shaped and arranged as to constitute a fundamentally end-burning grain.
REFERENCES:
patent: 2981060 (1961-04-01), Barnes
patent: 3067683 (1962-12-01), Wolf
patent: 3183665 (1965-05-01), Webb
patent: 3216193 (1965-11-01), Nagey et al.
patent: 3286471 (1966-11-01), Kaplan
patent: 3349565 (1967-10-01), Williams
patent: 3381476 (1968-05-01), Glick
patent: 3635030 (1972-01-01), Schubert et al.
patent: 3718094 (1973-02-01), Bermender
Kawasaki Kazunori
Kosaka Katsuaki
Croyle Carlton R.
Nissan Motor Company Limited
Simenauer Jeffrey A.
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