Analysis of System Factors Affecting Range-Related Accuracy of the 25mm Gun of the Bradley Fighting Vehicle

摘要

This analysis was conducted to determine if system errors in the Bradley Fighting Vehicle (BFV) negatively affect elevation or range-related aspects of 25mm gunnery accuracy. A Soviet BMP vehicle is about 2.15m high, but the horizontal ranging stadia of the integrated sight unit (ISU) on a fielded BFV was designed to determine range for a target of from 1.5 to 1.7m high (depending on the part of stadia used). For target ranges of 1800m and greater, super elevation (SE) compensation produced by the fire control system for armor piercing and high explosive ammunition was more and less, respectively, than indicated by firing tables. SE compensation of the auxiliary sight unit closely matched data from the firing tables. For a sample of fielded vehicles, ISU backlash was usually no greater than 0.5 mils, while the mean value for the auxiliary sight unit was 1.7 mils. Switching magnification of the ISU caused aiming changes that varied widely among vehicles. (0.5 to 5 mils). With these findings, BFV managers can identify potential system problems and undertake needed modifications. Keywords: Gunnery accuracy; M-242C Automatic gun; Range finding; Backlash. (EDC)