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A chemiluminescent tracer insert with decelerator for use with a shotgun shell to provide an aiming and training aid for shotgun shooting activities, including skeet, trap, sporting clays, hunting, law enforcement and military applications. The tracer insert can be used in shotgun shells of all gaug

A chemiluminescent tracer insert with decelerator for use with a shotgun shell to provide an aiming and training aid for shotgun shooting activities, including skeet, trap, sporting clays, hunting, law enforcement and military applications. The tracer insert can be used in shotgun shells of all gauges. The tracer insert comprises a translucent, resilient, elastic, cylindrical container in which the reactants, an oxalate and fluorescent-colored dye solution, and an activator encased in a glass vessel, are held. Ignition of the shell causes the glass vessel to break. The resulting chemiluminescent reaction causes emission of light visible to the shooter. Unattached ends of thin-flaps on the tracer insert extend outwardly when drag forces act upon them during flight, slowing the speed of the tracer insert, which makes it more visible to the shooter, thereby providing a consistent reference to enable a shooter to make corrections to his lead and/or shooting techniques.

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1. A chemiluminescent tracer insert for use with a shotgun shell having a lower end and an upper end, and further having propellant and a shot cup having a first end and an opposing second end and holding shot, the propellant being contained inside the lower end of the shotgun shell below the second

1. A chemiluminescent tracer insert for use with a shotgun shell having a lower end and an upper end, and further having propellant and a shot cup having a first end and an opposing second end and holding shot, the propellant being contained inside the lower end of the shotgun shell below the second end of the shot cup, the tracer insert having a centerline and comprising a resilient, elastic, translucent cylindrical container holding a first reactant, a second reactant, a fluorescent dye, and means for physically separating the first reactant from the second reactant and the fluorescent dye prior to their combination resulting in a chemiluminescent reaction, the tracer insert located inside the upper end directly under the crimped top of the shotgun shell, inside the first end of the shot cup and above the shot held in the shot cup, the cylindrical container having an outer surface having a plurality of integral resilient, elastic thin-flaps, the thin-flaps being symmetrically arranged with respect to the centerline of the tracer insert, each thin-flap having an unattached free end, the tracer insert moving separately from the shot cup and the shot after leaving a shotgun barrel, the free ends of the thin-flaps configured to peel away from the cylindrical outer surface of the container, each of the free ends individually extending elastically outwardly evenly therefrom and curling backwards in a position perpendicular to the flow stream and resulting drag forces acting on the free ends while the tracer insert is in flight, resulting in an increased projected area of the plurality of thin-flaps as the ends of the thin-flaps extend radially with respect to the centerline of the container, the increased projected area perpendicular to the flight path of the insert resulting in an increase in the dynamic pressure drag forces acting on the tracer insert, the increased drag forces thereby decelerating the tracer insert. 2. The tracer insert of claim 1 wherein the container is made from a material selected from the group consisting of polypropylene, polyethylene, polycarbonate, and nylon. 3. The tracer insert of claim 1 wherein the first reactant is a hydrogen peroxide solution and the second reactant is a phenyl oxalate ester solution. 4. The tracer insert of claim 1 wherein the means for physically separating the first reactant from the second reactant and the fluorescent dye comprises at least one frangible glass container. 5. The tracer insert of claim 1 wherein a disk-shaped spacer is arranged under and adjacent to the tracer insert in order to separate the tracer insert from the shot held in the shot cup and thereby ensure accuracy when the tracer insert is in flight. 6. The tracer insert of claim 5 wherein the disk-shaped spacer is made from plastic, cardboard, or cork. 7. The tracer insert of claim 1 wherein the free-ends of the thin-flaps can be formed on the surface of the container on one end of the container or on a middle portion of the container. 8. The tracer insert of claim 1 wherein the thin-flaps on the surface of the container varies in quantity, length, width, and thickness, depending on a particular application. 9. The tracer insert of claim 1 wherein the surface of the container has a rough finish. 10. A chemiluminescent tracer insert for use with a shotgun shell having a lower end and an upper end, and further having propellant and a shot cup having a first end and an opposing second end and holding shot, the propellant being contained inside the lower end of the shotgun shell below the second end of the shot cup, the tracer insert having a center of gravity near the upper end and a centerline and comprising a resilient, elastic, translucent cylindrical container holding a first reactant, a second reactant, a fluorescent dye, and means for physically separating the first reactant from the second reactant and the fluorescent dye prior to their combination resulting in a chemiluminescent reaction, the tracer insert located inside the upper end directly under the crimped top of the shotgun shell, inside the first end of the shot cup and above the shot held in the shot cup, the cylindrical container having an outer surface having a plurality of integral resilient, elastic thin-flaps, the thin-flaps being symmetrically arranged with respect to the centerline of the tracer insert, each thin-flap having an unattached free end, the tracer insert moving separately from the shot cup and the shot after leaving a shotgun barrel, the free ends of the thin-flaps configured to peel away from the cylindrical outer surface of the container without shifting the center of gravity of the tracer insert, each of the free ends individually extending elastically outwardly evenly therefrom and curling backwards in a position perpendicular to the flow stream and resulting drag forces acting on the free ends while the tracer insert is in flight, resulting in an increased projected area of the plurality of thin-flaps as the ends of the thin-flaps extend radially with respect to the centerline of the container, the increased projected area perpendicular to the flight path of the insert, resulting in an increase in the dynamic pressure drag forces acting on the tracer insert, the increased drag forces thereby decelerating the tracer insert.