Originally Posted by nevercrosses
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Just to clarify, are you saying the amount of the spin is mostly caused by the Line of Compression? Does speed play a part? Does loft play a part? Is HK also assuming a centered strike?
He goes on to say in 2-C-0 that maximum compression is the ideal result. Where can I find his definition of compression?
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Amount of spin is controlled by the location of the line of compression and the amount of compression. If speed affects the amount of compression and/or the location - then yes speed. Since loft is one factor that controls the location of the line of compression - then yes it plays a part.
He wouldn't assume a centered strike - but he would assume a strike on the sweet spot as one factor influencing a "maximum" compression impact. He also covers some issues of impacts where there is "compression leakage".
Besides studying the Golfing Machine book and the issues that you are interested in - you'd best understand his definition of compression by looking it up in the dictionary - also see the "Line of Compression" in the Glossary of the book.