Accession Number : AD0859272

Title :   Encapsulated Liquid Monopropellant Ammunition Feasibility Study.

Descriptive Note : Final rept. 10 Jun-10 Dec 68,

Corporate Author : MORTON THIOKOL INC BRIGHAM CITY UT WASATCH OPERATIONS

Personal Author(s) : Lund, Robert K.

Report Date : MAR 1969

Pagination or Media Count : 75

Abstract : Ammunition containing bulk loaded monopropellants have the characteristics of low flame temperature, high energy, reduced smoke and flash, and reduced fouling and longer barrel life. There is one disadvantage, however, that has prevented exploitation of these good attributes. Liquid monopropellants do not burn stably under the conditions existing in bulk loaded cartridges. High and erratic pressures occur accompanied by high frequency, high amplitude pressure excursions. Extensive experimentation has not solved this problem. The results of this study show that the problems of bulk loaded monopropellant can be overcome by encapsulation of the monopropellant into small spheres. This encapsulation yields very repeatable and uniform initial surface area similar to conventional smokeless ball powder. Proper ignition and the resulting combustion surrounding the liquid droplets prevents agglomeration into a large unstable bulk. Stable, uniform, and repeatable propellant combustion was the result. The results of a series of test firings were evaluated for the effects of alkyl nitrate mixture ratio, capsule size, capsule wall materials, primers, solid propellant booster levels, and cartridge case volume on round repeatability. Computer studies indicated that the postulated burning process was achieved, and it was concluded that a conventional cartridge case loaded with encapsulated monopropellant was feasible. (Author)

Descriptors :   *ENCAPSULATION), (*AMMUNITION, MONOPROPELLANTS), (*MONOPROPELLANTS, FEASIBILITY STUDIES, PRIMERS, SMOKELESS PROPELLANTS, IGNITION, COMBUSTION, BURNING RATE, NITRATES, NITROCELLULOSE, BORON COMPOUNDS.

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE