Maximum Compression

[Etzwane]

Looking for clarification on Sustaining the Line of Compression. Assuming that the sweet spot is moving on an inclined plane during the impact interval, and the cluface is square to that plane at separation, what factors will provide maximum compression or compression leakage? Assume contact on sweet spot at impact and same clubhead speed at separation.

Just a remark: according to Homer the ball direction is mostly given by the face angle at separation so the face should be square to the target (assuming an "all square" alignement), so for a ball placement before low point the face is closed to the arc or plane.