A shaft head for a speargun, comprising at least one tip (2) and at least one barb (3) which is pivoted so that it can rotate about a substantially transverse axis of rotation from a closed configuration, in which it is substantially adjacent to the head (1), to an open configuration, in which it is adapted to retain the prey; the head further comprises retention means (4), which are detachably engageable with at least one free end (5) of the barb (3), and the retention means (4) are movable from a configuration for locking the barb (3) in the closed configuration to a configuration for disengaging the free end (5) so as to allow the opening of the barb (3), at least the free end (5) having a shape and dimensions which are substantially complementary to those of a respective receptacle (6) provided on the head (1), so as to provide minimum space occupation following the engagement of the free end (5) in the receptacle (6) with consequent optimum hydrodynamic behavior of the shaft (A).

Une flèche pour arme de pêche sous-marine est divulguée, comportant une tige (10) à l'extrémité avant (10a) de laquelle est installée une pointe (2) se terminant par une extrémité pointue (20), le profil de la pointe (2) est formé par une paroi extérieure en pente qui converge vers l'extrémité pointue, laquelle paroi extérieure est constituée d'une face supérieure (2a) et d'une face inférieure (2b), ladite face inférieure (2b) présentant un pan incliné (20b) qui s'étend selon le plan sagittal (PS) de la flèche (FI) et qui converge vers l'extrémité pointue (20), où, dans le plan sagittal (PS), la pointe (2) a un profil dissymétrique tel que le pan incliné (20b) présente une pente qui est davantage allongée vers l'extrémité arrière (10b) que la pente de la face supérieure (2a). Une pointe (2) de pénétration pour une telle flèche est également divulguée.

Collars (510) are provided for broadheads (500). In some embodiments, the collars are shock collars with frangible tabs (514a,514b,414c) which restrain the blades (530a,530b,530c) of an expandable broadhead during flight, stabilizing the flight path of the expandable broadhead. The frangible tabs break off of the shock collar upon impact, allowing the blades of the expandable broadhead to deploy and increase the size of the entrance hole made in the target. In some embodiments, the collars center a ferrule (520) of a broadhead within an insert of an arrow.

The invention relates to ammunition for missile weapon and firearm.

The cavitating core of the invention comprises a head part conjugated with a secant nose surface along the cavitating edge, a central part, and an aft part with a gliding surface, wherein the caliber of the core is defined by the maximum diameter of the circle describing the core cross-section. The contour line enveloping the cross-sections from the cavitating edge to the core caliber in the plane of the core axial longitudinal section is limited by the dependence: $${\mathrm{D}}_{\mathrm{x}}\mathrm{=}\mathrm{d}\mathrm{\times }{\left[\mathrm{1}\mathrm{+}\left({\mathrm{L}}_{\mathrm{x}}\mathrm{/}\mathrm{d}\right)\mathrm{\times }{\left(\mathrm{2}\mathrm{\times }\mathrm{sin\; \phi }\mathrm{/}\mathrm{\pi }\right)}^{\mathrm{1}\mathrm{/}\mathrm{N}}\right]}^{\mathrm{N}},$$

where

D_x - is the current diameter of the core enveloping contour R, mm;

d - is the cavitating edge diameter, mm;

L_x - is the current distance from the cavitating edge to the core caliber, mm;

ϕ = 60°...270° - is the apex angle of the tangents to the secant nose surface at the points of its conjugation with the cavitating edge measured from the side of the head part;

N = (2π / ϕ)^0,4...(2π / ϕ)^0,2 - is the core volume factor, wherein the core caliber is equal to the current diameter of the core enveloping contour D_x.

As a result the invention makes it possible to increase the effective distance for hitting underwater targets when shooting from the air to the water and/or during underwater shooting using arbalests, harpoon guns, artillery, small and sporting-and-hunting weapons.