A weight adjustable javelin includes an elongated shaft having a leading end and a trailing end. A nose piece includes a conical shape, a nose tip, a nose base, and an internal nose slot defined along a longitudinal axis of the nose piece. The nose base includes an opening leading into the internal nose slot. A tail piece includes a tail tip, a tail base, and an internal tail slot defined along a longitudinal axis of the tail piece. The tail base includes an opening leading into the internal tail slot. The nose base is releasably secured to the leading end of the elongated shaft. The tail base is releasably secured to the trailing end of the elongated shaft. The internal nose slot and the internal tail slot are configured to receive and retain different sized and weighted rods therein.

A weight adjustable javelin includes an elongated shaft having a leading end and a trailing end. A nose piece includes a conical shape, a nose tip, a nose base, and an internal nose slot defined along a longitudinal axis of the nose piece. The nose base includes an opening leading into the internal nose slot. A tail piece includes a tail tip, a tail base, and an internal tail slot defined along a longitudinal axis of the tail piece. The tail base includes an opening leading into the internal tail slot. The nose base is releasably secured to the leading end of the elongated shaft. The tail base is releasably secured to the trailing end of the elongated shaft. The internal nose slot and the internal tail slot are configured to receive and retain different sized and weighted rods therein.

In accordance with embodiments a projectile can have a body and a tip attached to the body, the body including a nub portion extending from a second end of the body and optionally one or more fins surrounding a circumference of the body at the second end.

Mechanically attachable fletching is disclosed herein for a projectile having a shaft having an exterior surface. The mechanically attachable fletching includes at least one fin, a connection section bordering the at least one fin, and at least one mechanical fastener for attaching the fletching to the exterior surface of the shaft via the connection section. Also disclosed herein are methods for mechanically attaching fletching to the shaft of the projectile. Also disclosed herein are illuminated projectiles. Also described herein is a projectile having a shaft, a projectile head, and at least one fin. The projectile head preferably has a plurality of layers, the head end preferably being associated with the projectile head. Also described herein is a projectile that includes a shaft, a suction head, an outer head casing, and at least one fin. The suction head is preferably associated with the head end. The at least one launcher engager is preferably associated with the suction head. Two halves of the outer head casing preferably sandwich the suction head and the head end.

A toy dart having an elongate dart body of a foam material in a substantially cylindrical shape extending from a head end to a tail end in a first, longitudinal direction, an outer surface of the substantially cylindrical shape having a first ridge proximate the head end; a second ridge proximate the tail end; and one or more recessed areas disposed between the first ridge and the second ridge, where the elongate dart body has a first outer diameter at the first ridge and the second ridge that is larger than a second outer diameter at the one or more recessed areas; and a deformable dart cap affixed to the head end of the elongate dart body.

A dart may comprise—in order from the front thereof—a point, a barrel, a shaft, and a flight. The flight may comprise a plurality of fins. The fins may comprise mesh-like reinforcing ribs that protrude from surfaces thereof. The fins may further comprise, at peripheries thereof, fin rims formed so as to be of increased thickness. Reinforcing ribs may be formed over the approximate entireties of the fins. The shaft may comprise an insertion portion at the back end thereof. The flight may comprise a central axial hole having an opening at the front end thereof. The shaft may be removably installable with respect to the flight by virtue of a cap-like arrangement by which the insertion portion is inserted within, and is coupled and secured to, the central axial hole. The central axial hole may be formed from the front end of the flight to the back end thereof.

The present invention relates to a martial arts polearm posture sensing device and the posture sensing method thereof, wherein two sensor units are installed on the polearm neck and the polearm end separately in order to collect sensor signals of the angular acceleration, acceleration or/and geomagnetic field intensity of the polearm neck and the polearm end respectively, and then output the sensor signals to the outside. The signals generated by these two sensor units are received by the computer equipment and converted by the computation and conversion modules, installed in the computer equipment, into signals of the motion posture at a specific time and the overall motion trajectory of the martial arts polearm for output thus to facilitate the analysis and intelligent comparison by the smart sports module. The present invention helps the trainees and the instructors to learn or teach the martial arts polearm postures and makes the exercise and training easier while discovering the most suitable techniques and moves of the martial arts polearm.

An arrow golf system has a bow having a bowstring, an arrow having a shaft with a ball on one end with a fletching and a string nock on an opposite end, a starting location, a finishing location, and a capturing apparatus at the finishing location. A player shoots the arrow from the starting location with the bow, to a second location closer to the finishing location, retrieves the arrow at the second location, and shoots the arrow toward the capturing apparatus from the second location.

A magnetic dartboard game system comprising a plurality of magnetic darts and a dartboard is described. In some implementations, the magnetic dartboard system comprises a dartboard having a backing portion, a metal layer portion, and a decorative cover portion. In some implementations, the magnetic dartboard system also comprises a magnetic dart having: a shaft body having a first end and a second end, said shaft body having a geometric shape with one or more tapers; a threaded cap, wherein the threaded cap is configured to thread onto the first end of the shaft body; a magnet having a first end and a second flat end, wherein the first end of the magnet rests on the second end of the threaded cap; and a balance tail fin with one or more vanes, wherein the balance tail fin is configured to attach to the shaft body of the magnetic dart.

A hobby projectile may include, but is not limited to: a ball-type projectile having a substantially spherical shape and constructed at least partially of a foam material; and a magnetic or magnetizable component. At least a portion of the ball-type projectile may be at least partially coated with a magnetic or magnetizable component or may include magnetic or magnetizable particles and/or fibers embedded therein.