Fremgangsmåte og innretning for å forbedre en artillerigranats eksterne ballistikk

摘要

The present invention relates to a method and a device for improving-at least in part-the external ballistieds of primarily the type of artillery shells ( 1 ) that are fin-stabilised in their trajectory towards the target and thus have a slipping plastic driving band ( 6 ) which, during firing of the said shell from a designated barrel, constitutes the shell's direct contact with the inside of the barrel. The problem that it is the function of the present invention to resolve is that the slipping plastic driving band ( 6 ) normally detaches immediately outside the muzzle of the barrel used for firing, thereby leaving an open groove ( 4 ) that causes distrubing turbulence which is detrimental to the flight of the said shell. The solution to the problem herein proposed is based on a ring-shaped spring-loaded device ( 5 ) arranged between the driving band ( 6 ) and the bottom of the driving band groove ( 4 ) and which device is held pressed against the bottom of the said driving band groove as long as the driving band ( 6 ) is in position but as soon as it detaches from the said driving band groove the said device deploys to re-assume a pre-determined original shape which completely fills the driving band groove ( 4 ) up to and level with the outer surface of the shell ( 1 ).