Abstract: A broadhead assembly including a main body, a pivoting blade, a trailing arm, and a collar, so as to permit the selection of multiple cutting diameters. The blade is coupled to the main body proximate to the tip. The blade is configured to pivot about an axis in communication with the main body to operate between a first position and a second position. The blade includes a socket along a trailing edge. A trailing arm extends between the main body and the blade and has a disc for insertion into the socket. The collar selectively regulates rotation of the trailing arm and therefor the pivoting of the blades so as to vary the cutting diameter. The collar is configured to include channels of different depths and slopes and restricts rotation of the trailing arm by particular alignment of the trailing arm with a particular set of channels.

Abstract: A broadhead assembly for use with an arrow shaft includes a main body, a blade assembly, and an attachment member. The main body has a central axis and a mating surface for coupling to the arrow shaft. The blade assembly rotatably couples to the main body, and is oriented so as to rotate radially to the central axis. The blade assembly has a blade axis of rotation. The attachment member is coupled to the main body and configured to secure the blade assembly in a closed orientation. Rotation of the blades within the blade assembly is such that they rotate about the blade axis and the blade axis is parallel to the central axis.