Accession Number : AD0002593
Title : Test of 3 in/50 AA Projectiles with Copper Welded-Overlay Rotating Bands
Descriptive Note : Final rept.
Corporate Author : NAVAL WEAPONS LAB DAHLGREN VA
Personal Author(s) : Rischall, H
Report Date : Feb 1953
Pagination or Media Count : 44
Abstract : Tests were conducted to compare the metallurgical and physical properties and the ballistic performances of the 3-in./50-cal Mk 33 Mod O AA projectiles with Cu welded-overlay bands (I) and standard Mk 33 Mod O projectiles (II). At proof or service pressure, I had better band engraving upon firing from a new gun; however, in a worn gun at service pressure, II showed slightly better band engraving. Both bands failed at proof pressure in a worn gun. The cavity deformation under the band was greater for I. Hard globules of steel in the Cu of I came from the 4.5 to 8.5% Fe which the bands picked up from the projectile during welding. These hard spots would increase gun wear. Range firing results of I and II were about equal. Bore and flight-safety tests on I fired from new and old guns were satisfactory.
Descriptors : *EXTERIOR BALLISTICS , *ANTIAIRCRAFT AMMUNITION , *ROTATING BANDS , FIRING TESTS(ORDNANCE) , DEFORMATION , SPHERES , STEEL , WEAR , PRESSURE , AVIATION SAFETY , RANGES(FACILITIES) , WELDING , METALLURGY
Subject Categories : Ammunition and Explosives
Distribution Statement : APPROVED FOR PUBLIC RELEASE