Product Improvement Test of Cartridge, 81-mm, HE, M374, with Reduced Bourrelet and Waterproof Ignition - Propellant System
Abstract
This test was conducted to determine whether the modifications to the round provided waterproofness properties to the propellant without adversely affecting velocity, pressure, and range and without introducing safety or human-factors problems. The test round was found to be only a marginal improvement over the standard round in eliminating short rounds following waterproofness tests. Velocity levels were significantly higher for the test round at all charges but charge 4 when compared with the standard round at +70 deg F. This difference would require an adjustment of the propellant charge or a correction to the existing firing tables. Residue did not appear to be a problem nor was safety degraded by the modification. Cookoff properties were remarkably different in that the test round is launched at apparent full velocity. The obvious advantage is that a live round does not impact close to the mortar position. It is concluded that the test cartridge provides a replacement for the present standard round with some moisture protection but not to the degree of being a suitable water - moisture resistant round and that the difference in velocity levels of the two cartridge types is significant. No human-factors or safety problems were encountered.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1969
- Accession Number
- AD0858984
Entities
People
- Harvey W. Cheater