REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

THE INFLUENCE OF THE CHANGE IN THE ELEVATING MASS ON THE CONSTRUCTION OF BALANCING GEAR OF ANTI – AIRCRAFT GUN BOFORS 40 mm l/70

NIKOLA ZELENOVIĆ

Military Technical Institute, Ratka Resanovića 1, 11132 Belgrade, Serbia
tel.: +381 64 359 6607, e-mail: zeleni93@gmail.com

ALEKSANDAR KARI

Military Academy - University of Defence, Pavla Jurišića Šturma 33, 11000 Belgrade, Serbia
tel.: +381 64 026 0779, e-mail: aleksandarkari@gmail.com

ALEKSANDAR STANOJEVIĆ

Military Technical Institute, Ratka Resanovića 1, 11132 Belgrade, Serbia
tel.: +381 62 965 8467, e-mail: aleksandar_bor@live.com

Abstract: The reconstruction of the anti – aircraft gun’s loader and the increase in its capacity leads to an elevating mass debarment in relation with the axis of the gun’s trunnion which creates a need for balancing gear reconstruction. The elevating mass is completely balanced in all elevations and even throughout the recoil movements by two balancing gears. Elevation balancing gear is on the left side of the gun while recoil and elevation balancing gear is on the right side. The mass increase is happening on the far back side of the gun and leads to translation of center of mass which makes pulling effects of balancing gears negative for the balance of elevating mass. By creating a real 3D model of the gun, new mass and its center of gravity are found. Using that information and knowing characteristics of balancing gears makes it possible to reconstruct them and create an elevating mass equilibrium.

Keywords: anti – aircraft gun, balancing gears, elevating mass, equilibrium.