| Abstract [eng] |
In this paper structural and technical performance characteristics of the FN MAG KSP – 58 medium machine gun, used by the Lithuanian military, were analyzed. An overview of the UH – 60 “Black Hawk” helicopter’s technical characteristics has been carried out. Various medium machine gun mounts for the helicopter door gunner have been examined. Looked into already existing door gunner trainers that don't use live ammunition, their working principles and advantages. Analysis of present forces and dynamic characteristics during shooting from a machine gun mount. After performing theoretical calculations, it was concluded that the training stand suppresses all weapon motions until it returns to its starting position. It was concluded, that one of the most important parts in gunnery training is the exact replication of the door gunner position and machine gun mount. It was concluded that the gunnery trainer must accurately replicate the helicopter machine gun mount, gunners position and field of view. Projected the training stand to be usable for both indoor training and outdoor shooting range exercises, able to mount a medium machine gun FN MAG KSP – 58 and a trainer weapon replicating it. This paper provides a concept for a helicopter door gunner training stand created using ,,Solidworks" software. Dynamic forces and virtual fatigue analysis of the training stand, which was created based on UH – 60 ,,Black Hawk" helicopter door gunner position parameters, firing from the medium machine gun FN MAG KSP - 58. Virtual structural strength analysis identified the stresses acting on the structure of the training stand and their location. During the virtual fatigue analysis, it was determined that after 1 000 000 shots, the training stand did not suffer any structural damage or permanent deformation. An experiment was performed to find recoil dynamic characteristics of single shot and burst firing medium machine gun FN MAG KSP – 58 when having the weapon mounted on the training stand and placed on the ground. Evaluated the size and difference in recoil kick while using different types of blank ammunition. During the experiment it was discovered that while the machine gun is mounted on the training stand, the shooter experiances approximately 10 N reduced recoil kick compared to firing with the weapon placed on the ground. It was discovered that blank rounds in plastic casings generate less force when fired compared to metal casings; therefore, the recoil force and rate of fire gets reduced. |
