Hard target fuze

An armed projectile product produced by the process comprising the steps of:

• providing a safe-and-arm device for a projectile fired from a smooth bore gun comprising a fuze housing, a rotor within the fuze housing, the rotor having a first rotational position and a second rotational position wherein the rotor is retained in the first rotational position by a setback sensor, a rotor spring having a tensioned state bearing against the rotor while the rotor remains in the first rotational position wherein the rotor spring exerts a force onto the rotor sufficient to rotate the rotor to a second rotational position, the setback sensor holding the rotor in the first rotational position with the setback sensor interconnected between the faze housing and rotor wherein the setback sensor retains the rotor in the first rotational position in opposition to the tensioned state of the rotor spring, a bore rider extending through the fuze housing that is positionally fixed against the rotational movement of the rotor, a retaining device causing a bearing force against the bore rider sufficient to retain the bore rider within the fuze housing, a bore rider spring tensionally compressed within the retained bore rider wherein the bore rider spring connected to the bore rider remains capable of ejecting the bore rider from within the projectile absent a bearing force against the bore rider, a shear pin pinning the setback sensor while the setback sensor holds the rotor in the first rotational position and an explosive train having at least two sections, wherein the first rotational position of the rotor interrupts the explosive train and the second rotational position of the rotor enables the explosive train;
• and,
• firing the projectile from the smooth bore gun, wherein the setback sensor upon reaching a selected shear acceleration force shears the shear pin and moves to an aft position in the fuze housing which permits release of the bore rider allowing the rotor to rotate and enable the explosive train.

A method for arming a projectile fired from a smooth bore gun, comprising the steps of:

• providing a safe-and-arm device for a projectile fired from a smooth bore gun comprising a fuze housing, a rotor within the fuze housing, the rotor having a first rotational position and a second rotational position wherein the rotor is retained in the first rotational position by a setback sensor, a rotor spring having a tensioned state bearing against the rotor while the rotor remains in the first rotational position wherein the rotor spring exerts a force onto the rotor sufficient to rotate the rotor to a second rotational position, the setback sensor holding the rotor in the first rotational position with the setback sensor interconnected between the fuze housing and rotor wherein the setback sensor retains the rotor in the first rotational position in opposition to the tensioned state of the rotor spring, a bore rider extending through the fuze housing that is positionally fixed against the rotational movement of the rotor, a retaining device causing a bearing force against the bore rider sufficient to retain the bore rider within the fuze housing, a bore rider spring tensionally compressed within the retained bore rider wherein the bore rider spring connected to the bore rider remains capable of ejecting the bore rider from within the projectile absent a bearing force against the bore rider, a shear pin pinning the setback sensor while the setback sensor holds the rotor in the first rotational position and an explosive train having at least two sections, wherein the first rotational position of the rotor interrupts the explosive train and the second rotational position of the rotor enables the explosive train;
• and,
• firing the projectile from the smooth bore gun, wherein the setback sensor upon reaching a selected shear acceleration force shears the shear pin and moves to an aft position in the fuze housing which permits release of the bore rider allowing the rotor to rotate and enable the explosive train.