Determining optimal iron spin

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never trust range balls unless you are 100% sure they are the real thing.

Link to patent : Low-resilience Limited Flight Golf Ball

patent said:
[0003] Practice ranges that have limited space require a "limited flight" range ball. Range balls suitable for use as "limited flight" range balls have been sold for a number of years. Examples of "limited flight" range balls are the Wilson.RTM. CF Range, manufactured by Wilson Sporting Goods, and the Spalding.RTM. Limited Flight Range ball, manufactured by the Callaway Golf Company. These balls are similar in construction to conventional range balls. The flight distance is restricted (reduced) through the use of an inefficient dimple pattern, which results in shorter distance than conventional range balls. However, these less efficient dimple patterns produce shorter flight distance through undesirable and objectionable flight trajectory. Specifically, the short distance is obtained through a pattern with shallow dimples, resulting in a very high trajectory, described as "ballooning." This trajectory is objectionable to the golfer, and is not beneficial to the golfer "practicing" his swing.
 
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