Accession Number:

AD0261180

Title:

INVESTIGATION OF CASE STRETCH OCCURRING IN LOT LC 22-103A DURING M61 GUN ACCEPTANCE TESTS AT GENERAL ELECTRIC COMPANY

Descriptive Note:

Corporate Author:

LAKE CITY ARSENAL INDEPENDENCE MO

Personal Author(s):

Report Date:

1961-07-01

Pagination or Media Count:

1.0

Abstract:

During M61 gun acceptance tests in February, 1959, severe case stretches and four complete circumferential ruptures occurred in firing ammunition Lot LC 22-103A, cartridge, ball, 20mm, M55A1. Several meetings were conducted relative to the problem of case stretch in the M61 gun. General conclusions reached at these meetings were to the effect that the problem was basically one of weapon design and not ammunition. The results of the IED tests on Lot LC 22-103 indicate that the case stretch conditions observed at the General Electric plant were affected by the rate of fire and lubrication. Neither of these conditions could be regarded as su ficiently constant to assure reproducibility of results. It is therefore believed that the stretched case condition in the lot in question was the result of conditions peculiar to the particular weapons involved, particularly since tests conducted at other facilities using the same ammunition lot but different weapons did not in all cases produce the same results. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE