ENGINEERING TEST OF IN-BORE SCAVENGER FOR TANK, COMBAT, FULL-TRACKED, M60A1E2.
Partial rept. no. 1, Oct 67-May 68,
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This report covers the first 1343 rounds of a test conducted October 1967 to May 1968 to evaluate the in-bore scavenger for the 152-mm gun in the M60A1E2 tank. Four major designs were tested, the first using CO2 as a scavenging gas and the rest using compressed air. The problems of toxic fumes and flareback were easily overcome, but none of the designs would satisfactorily remove smoldering residue. The last design, however appears to be a step in the right direction. This design operates by using three blasts of air at a pressure around 1000 psi. The first shot occurs as soon as the weapon returns to battery and lasts 0.25 second. It is directed down the tube from two holes in the breech chamber. The second shot occurs as the chamber is withdrawing from the coupling. Two poppet or plunger valves enter through the coupling and direct air at the breech face and forcing cone. This shot lasts 0.35 second. The third shot is an 0.20-second shot exactly like the first, except that it occurs as the breech completes withdrawal. It was found that the second and third shots were overlapping and cancelling each other. Subsequent delay testing established as satisfactory an 0.60-second time delay in the chamber opening cycle. It is therefore recommended that an in-bore scavenger of the three-shot design with an 0.60-second delay be submitted for complete evaluation. Author
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