The sole shape can be designed with ease. The invention provides a method for designing an iron sole shape that includes the steps of setting different parameter values (S1) relating to a sole shape while keeping parameters other than those of the sole shape constant, preparing an iron club (S2) having the parameter values that have been set, a tester using the iron club that has been prepared to hit a ball (S4), measuring a path of the club head (S5) using a camera to obtain data relating to a position and a velocity of the club head, and determining whether or not the sole shape is favorable (S6) based on the data that have been obtained.

Apparatus and a method for computing and outputting a putting backstroke instruction for a planned putt of a golf ball during recreational play. A computing means includes means for initializing or customizing according to a specific golfer putting on a specific golf green, the golfer putting at least one initializing putt a pre-selected distance on a level area of a green. During recreational play thereafter, in the preferred embodiment of the invention, the golfer, for each segment of a planned putt enters the applicable grade and length. The computing means outputs to the golfer an instruction for the length of the backstroke recommended, i.e., required for the planned putt. Another embodiment of the invention requires the inputting of the length of the planned putt but excludes the inputting of the grade of the green.

A launch monitor that includes substantially all of its functional components on or within a housing is disclosed. In one embodiment, the launch monitor is capable of being transported and used in any desired location. One or more camera's, flashes, and triggers may be used to acquire images of a golf club and golf ball. The launch monitor is preferably capable of receiving and transmitting data over a wireless network. Acquired images and other data may be analyzed by a processor, and then displayed using an LED, LCD or other type of display or printer. The launch monitor may "recognize" a plurality of golf clubs and golf balls based on an optical fingerprint. The optical fingerprints, which are preferably stored in a memory, allow the launch monitor to identify a golf club and/or ball substantially soon after they are placed in the field of view of the monitor Optical fingerprinting enables automatic record keeping, and storing performance data and equipment used simultaneously. This feature eliminates tedious record keeping, eliminates data entry errors, and enables rapid equipment optimization.

A launch monitor that includes substantially all of its functional components on or within a housing is disclosed. In one embodiment, the launch monitor is capable of being transported and used in any desired location. One or more camera's, flashes, and triggers may be used to acquire images of a golf club and golf ball. The launch monitor is preferably capable of receiving and transmitting data over a wireless network. Acquired images and other data may be analyzed by a processor, and then displayed using an LED, LCD or other type of display or printer. The launch monitor may "recognize" a plurality of golf clubs and golf balls based on an optical fingerprint. The optical fingerprints, which are preferably stored in a memory, allow the launch monitor to identify a golf club and/or ball substantially soon after they are placed in the field of view of the monitor Optical fingerprinting enables automatic record keeping, and storing performance data and equipment used simultaneously. This feature eliminates tedious record keeping, eliminates data entry errors, and enables rapid equipment optimization.

Improved golf club heads indicating the location of an optimum hit point on the striking face for maximum shot distance of any hit location on the face ("maximum distance spot", called MD) and an indication of a second optimum hit point giving best distance, with the condition of minimum or no change of torque caused feel as perceived by the golfer at impact ("best feel spot," called BF) are disclosed. Methods to locate these optimum locations are described. It has been widely assumed and believed that these two points have the same location. The present inventors have found that this is not true. The principal application is to "wood" type golf clubs designed to hit golf balls from a tee, but can provide useful information for clubs hitting balls from the ground. The indication of MD and BF locations on the club face may take any of various forms.