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?
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.
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