Disclosed is a kind of combination fireworks, in which a plurality of paper tubes form a tube row, and the plurality of tube rows are stacked and assembled for forming, wherein each tube row is provided with a bottom cardboard, two sides of the bottom cardboard are correspondingly provided with notch positioning holes, and the bottom cardboard beside the notch positioning holes forms the protruding cardboard beside the holes; the cardboard beside the holes is folded and stuck on both sides of the paper tube, and both ends of the paper tube are respectively embedded in corresponding notch positioning holes. The structure of spaced tube rows is adopted, so that the radial size error of the tube body of the paper tube is not accumulated in the tube rows, thus allowing the tube body to accurately reach a predetermined work position, and improving the accuracy and reliability of subsequent processes.

Disclosed is a kind of combination fireworks, in which a plurality of paper tubes form a tube row, and the plurality of tube rows are stacked and assembled for forming, wherein each tube row is provided with a bottom cardboard, two sides of the bottom cardboard are correspondingly provided with notch positioning holes, and the bottom cardboard beside the notch positioning holes forms the protruding cardboard beside the holes; the cardboard beside the holes is folded and stuck on both sides of the paper tube, and both ends of the paper tube are respectively embedded in corresponding notch positioning holes. The structure of spaced tube rows is adopted, so that the radial size error of the tube body of the paper tube is not accumulated in the tube rows, thus allowing the tube body to accurately reach a predetermined work position, and improving the accuracy and reliability of subsequent processes.

A pyrotechnic projectile, an electronic controller for a pyrotechnic projectile, and a method of controlling a pyrotechnic projectile are provided. The pyrotechnic projectile comprises: a burst charge, configured to provide an a visual and/or audible effect upon activation thereof; an electronic match configured to activate the burst charge; and an electronic controller, coupled to the electronic match. The electronic controller is configured to determine an altitude of the pyrotechnic projectile and cause the electronic match to activate the burst charge at least in part according to the altitude of the pyrotechnic projectile.

A composition that includes a fuel and a perfluoropolyether (PFPE) is disclosed. The composition may be used as a flare composition in a countermeasure device. Countermeasure devices including the flare composition are also disclosed, as are methods of forming grains of the countermeasure device.

A composition that includes a fuel and a perfluoropolyether (PFPE) is disclosed. The composition may be used as a flare composition in a countermeasure device. Countermeasure devices including the flare composition are also disclosed, as are methods of forming grains of the countermeasure device.

Described herein is an explosive casing, cartridge or housing, as well as a method of making same, for a small explosive or firecracker such that when fully assembled results in a tetrahedron or pyramidal, 3-D structure that provides an enhanced explosive sound and bursting strength.

Described herein is an explosive casing, cartridge or housing, as well as a method of making same, for a small explosive or firecracker such that when fully assembled results in a tetrahedron or pyramidal, 3-D structure that provides an enhanced explosive sound and bursting strength.

An aerial shell comprising at least one combustible layer of combustible material, the at least one combustible layer including an outermost combustible layer surrounding the at least one combustible layer, the outermost combustible layer configured to ignite on substantially an entire outer surface, the outermost combustible layer including a relatively higher combustion rate than the at least one combustible layer; the at least one combustible layer including an innermost combustible layer surrounding and containing at least one pyrotechnic effect and a dispersive explosive charge; the at least one pyrotechnic effect is preferentially disposed with respect to the innermost combustible layer at least one of immediately adjacent including integral with an inner surface of the innermost combustible layer and spaced away from the inner surface of the innermost combustible layer; the at least one combustible layer configured to burn substantially throughout the at least one combustible layer.

An aerial shell comprising at least one combustible layer of combustible material, the at least one combustible layer including an outermost combustible layer surrounding the at least one combustible layer, the outermost combustible layer configured to ignite on substantially an entire outer surface, the outermost combustible layer including a relatively higher combustion rate than the at least one combustible layer; the at least one combustible layer including an innermost combustible layer surrounding and containing at least one pyrotechnic effect and a dispersive explosive charge; the at least one pyrotechnic effect is preferentially disposed with respect to the innermost combustible layer at least one of immediately adjacent including integral with an inner surface of the innermost combustible layer and spaced away from the inner surface of the innermost combustible layer; the at least one combustible layer configured to burn substantially throughout the at least one combustible layer.

A pyrotechnic projectile, an electronic controller for a pyrotechnic projectile, and a method of controlling a pyrotechnic projectile are provided. The pyrotechnic projectile comprises: a burst charge, configured to provide an a visual and/or audible effect upon activation thereof; an electronic match configured to activate the burst charge; and an electronic controller, coupled to the electronic match. The electronic controller is configured to determine an altitude of the pyrotechnic projectile and cause the electronic match to activate the burst charge at least in part according to the altitude of the pyrotechnic projectile.