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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/002593.pdf


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