Product Improvement to Incorporate a Fluid Immersed Ball Rotor S and A Device in the M550 40mm Dual Purpose Grenade Fuze.

摘要

This is the third in a series of contracts to apply the teachings of a ball rotor computer program to various projectiles. Contract DAAA21-73-C-0650 and follow-on Contract DAAA21-74-C-0481 demonstrated that ball rotor fuze design constructed according to the teachings of a Breed Corporation ball rotor computer program could meet current arming distance criteria for 20MM, 40MM, and 57MM projectiles. This contract was a product improvement program to reduce the cost of a low velocity 40MM fuze, including the requirement to investigate the use of an automatic centering system which would place the ball rotor on the spin axis of the projectile eliminating the effects of shell eccentricity. Shell eccentricity has been found to be one of the causes of erratic ball rotor behavior.