M203 Propelling Charge Residue Investigation. Part II.
Abstract
Part II of the M203 residue problem was initiated because of an unacceptably high frequency of residue in gun firing tests conducted using ambient 21 C (70 F) conditioned charges of lot 79A-06087 with Indramic 170C wax in the wear preventive additive liner. Most instances of residue were observed with tube temperature above 82 C (180 F). Laboratory investigations and tests leading to a gun firing plan are described. Gun firings showed that charges made with Polywax 655, a more brittle wax, produced less residue than any other charge configuration. Factors other than the choice of wax in the liner which increased the frequency of residue were: higher tube temperature and longer chambering time (which softens the wax), rayon and lead laminate as the liner substitute, and increased a mounts of dacron staple in the liner. Since these characteristics tend to impede liner breakup, their effect is consistent with the proposed mechanism for residue formation. Charges made using Polywax 655 with scrim liners have been shown to be free of residue when fired in gun tubes up to 149 c (300 F) with chambering times under 30 seconds.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1981
- Accession Number
- ADA095351
Entities
People
- D. Ellington
- D. S. Downs
- Kasey J. Russell
- L. E. Harris
Organizations
- United States Army Armament Research, Development and Engineering Center