Abstract: A safety and arming unit with a safe separation distance device (14), which acts as a function of a free-flight incident flow and temperature, for the fuze (12) of a projectile (11), which fuze is hermetically sealed from environmental influences, has, as a measurement device for the cooling, as a function of the incident flow, of a conductor through which current passes, in the heating circuit (18) of a resistant heating element (16) which is fitted flat on the fuze casing surface (17), an electronic current measurement apparatus (21) which is connected upstream of an evaluation circuit (22), in order to ram a firing circuit. Two heating elements (16, 16?), which are fed in the same way, are preferably arranged one behind the other in the incident flow direction (15), and, additionally as an environmental temperature sensor, a comparison heating element (16?) which is not influenced by the incident flow (15).

Abstract: A safety and arming unit with a safe separation distance device (14), which acts as a function of a free-flight incident flow and temperature, for the fuze (12) of a projectile (11), which fuze is hermetically sealed from environmental influences, has, as a measurement device for the cooling, as a function of the incident flow, of a conductor through which current passes, in the heating circuit (18) of a resistant heating element (16) which is fitted flat on the fuze casing surface (17), an electronic current measurement apparatus (21) which is connected upstream of an evaluation circuit (22), in order to ram a firing circuit. Two heating elements (16, 16?), which are fed in the same way, are preferably arranged one behind the other in the incident flow direction (15), and, additionally as an environmental temperature sensor, a comparison heating element (16?) which is not influenced by the incident flow (15).

Abstract: In an artillery fuse (12), particularly having a braking fuse function, in the course of the loading procedure of the howitzer for firing ammunition equipped with such a fuse (12), a quantity of data significantly larger than the typical fuse-setting information may be supplied parallel in time to the typical inductive fuse-setting procedure, particularly initialization information for satellite navigation to be performed on board after firing the ammunition, if the fuse (12) is equipped according to the present invention in the region of its cap (11), which is shaped like a hollow truncated cone, with at least one infrared-radiation-sensitive data interface (13), which works together bidirectionally with a coupling element (16). Preferably, a transceiver is positioned on the fuse (12) for bidirectional data communication, while a ring (15), which may be pulled over its tip (14), is equipped with at least three receivers distributed around the ring circumference as the coupling elements (16).