A golf club head comprising a crown defining an upper surface of the golf club head; a sole defining a lower surface of the golf club head, wherein said sole is substantially convex in shape; a skirt extending between the crown and the sole; a face defining a ball-striking surface and intersecting said sole at a leading edge; an interior cavity defined by said crown, sole, skirt, and face; a coordinate system with an x-axis located horizontal to said face, a y-axis located vertical to said face, and a z-axis located through said face, said z-axis and said x-axis parallel to a ground plane when said golf club head is held at address on said ground plane; a depression formed in said sole, wherein said depression is substantially concave and protrudes inwards towards said interior cavity of said golf club head.

An iron-type golf club head includes a ball striking face and a rear weight member that are engaged through one or more resilient members with a connection structure that creates a mass-damping effect at impact with a golf ball.

An improved projectile throwing apparatus is described comprising a handle, an elongate shaft, and a throwing head for throwing a projectile, such as a golf ball. The throwing head may be interchangeable with golf shafts of varied lengths, with lacrosse shafts, or other shafts to achieve accurate, long distance golf ball throws. The throwing head may be shaped to achieve throws of different distance, launch angle, and trajectory, optionally imparting spin with a retrograde ramp at the distal end of the throwing head. The throwing apparatus is useful for golf-type game play, including for those with physical disabilities, as well as for a training and instructional aid for golf, lacrosse, and other sports.

Systems and methods are described for providing coaching, training, or equipment specification information to individual golfers based on data generated during their individual golf swings. Additionally, data hubs are described that provide information and services to individuals based on data collected for a community of multiple golfers. Such community data hub systems and methods may provide one or more of the following: (a) storage of scoring data, swing data, ball flight data, and/or equipment data for multiple golfers; (b) at least some level of individual access to the stored data for the community; and/or (c) electronic interaction between golfers within the community.

A swing training device for improving the batting mechanics of baseball players includes a device handle for gripping by a player in the manner of a baseball bat handle and a device barrel having a ball striking surface. The device barrel is interfaced at an angle from about 20 to about 40 to the device handle. At least the ball striking surface of the device barrel is formed in the size and circular shape of a baseball bat barrel. A joint maybe provided for interfacing the device barrel to the device handle at the desired angle of interface, in which case threaded bolts are utilized to attach the device handle and the device barrel to the joint. Longitudinally oriented threaded bores are provided on substantially planar faces of the device handle and the device barrel to matingly receive the bolts.

A golf club includes a shaft; a head mounted to the tip end of the shaft; a grip mounted to the butt end of the shaft; a first vibration damping member arranged on the head side of the shaft; and a second vibration damping member arranged on the grip side of the shaft. The first range of the shaft in which the first vibration damping member is arranged includes a position of the shaft corresponding to the top end of the hosel of the head and has a length of 25 to 250 mm in the longitudinal direction of the shaft. The second range of the shaft in which the second vibration damping member is arranged includes a position of the shaft corresponding to the tip end of the grip and has a length of 150 to 250 mm in the longitudinal direction of the shaft.

A multi-sport ball is provided having an outer ball and an intermediate ball. The outer ball includes an outer ball first side and an outer ball second side, wherein the outer ball forms an intermediate compartment therein. The intermediate ball has a different shape than the outer ball and the intermediate compartment is configured to receive the intermediate ball. The outer ball first side and the outer ball second side each having a mating face, wherein the outer ball first side and the outer ball second side are configured to be separated at the mating faces.

A multi-sport ball is provided having an outer ball and an intermediate ball. The outer ball includes an outer ball first side and an outer ball second side, wherein the outer ball forms an intermediate compartment therein. The intermediate ball has a different shape than the outer ball and the intermediate compartment is configured to receive the intermediate ball. The outer ball first side and the outer ball second side each having a mating face, wherein the outer ball first side and the outer ball second side are configured to be separated at the mating faces.

Various forms of insect zappers, game methods, and kits for insect hunt game playing are disclosed. In one form, an insect zapper includes a power grid portion, a user control portion, and a handle portion. A user control portion comprises one or more features for operation or control of the device and a signal portion for providing operational and gaming related feedback such as cumulative kills and kill ratio. A variety of games centered around the successful hunt of biting insects such as mosquitos are disclosed involving a single player wherein a player competes against themselves or involving two or more players competing against each other. In some forms a kit may be provided to include gaming instructions, one or more insect zappers, and other accessories.

Various forms of insect zappers, game methods, and kits for insect hunt game playing are disclosed. In one form, an insect zapper includes a power grid portion, a user control portion, and a handle portion. A user control portion comprises one or more features for operation or control of the device and a signal portion for providing operational and gaming related feedback such as cumulative kills and kill ratio. A variety of games centered around the successful hunt of biting insects such as mosquitos are disclosed involving a single player wherein a player competes against themselves or involving two or more players competing against each other. In some forms a kit may be provided to include gaming instructions, one or more insect zappers, and other accessories.