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AssigneeThe United States of America as represented by the Secretary of the Army
InventorsRobert E. Betts, Samuel Zeman
Estimating the term…
A gun launched rocket motor is provided with a filler material to fill all f the free volume in the rocket with a void-free incompressible "filler". The described filler material is selected from a solid, semi-solid, or liquid having many properties closely comparable to the rocket propellant, especially match the density, chemical compatibility, coefficient of thermal expansion, and thermal stability. The filler material functions to provide the required physical support to various propellants to survive gun launch. A preferred filler material is a completely fluorinated organic material which is a liquid which is compatible with various solid rocket propellants and can readily be ejected from the chamber by pressurization from conventional igniters or combustible cords such as Rapid Deflagrating Cord, RDC. These completely fluorinated perfluoro compounds, which are designated as C5-18 compounds, are marketed as Fluorinert Brand Electronic Liquids by 3M Corporation, St. Paul, Minn. More specifically, the Fluorinert liquid compound, which is designated as FC-77, has a density of 1.78 g/ml which matches highly aluminized composite rocket propellants. FC-77 has a desirably high boiling point (97.degree. C.), low temperature pour point (-110.degree. C.), and a coefficient of thermal expansion of 0.0014 ml/ml.degree. C. which is lower than many organic liquids and comparable to solid propellants. The family of Fluorinert compounds available from 3M Corporation have properties that cover a wide area providing matching properties such as densities of solid propellants for most, if not all gun boosted applications.
The method of enabling a solid propellant rocket to survive gun launching by protecting said solid propellant rocket and its propellant from the heat, shock, high pressure, and acceleration forces involved during launch to thereby permit said solid propellant rocket after leaving the nozzle of the gun to be ignited and flown as a guided or unguided rocket to deliver a projectile with a greater range than could be achieved by unpowered gun launched projectile, said method comprising:
The method of enabling a solid propellant rocket to survive gun launching by protecting said solid propellant rocket and its propellant from the heat, shock, high pressure, and acceleration forces involved during launch to thereby permit said solid propellant rocket after leaving the nozzle of the gun to be ignited and flown as a guided or unguided rocket to deliver a projectile with a greater range than could be achieved by unpowered gun launched projectile, said method comprising:
Dependencies are inferred from the claim text.