[Jeff]

Bagger - you wrote-: "The greater the angle from the center of the boat to point C, the greater the angle of the ski "blade" otherwise the skier is decelerating."

I cannot understand this point. If the curve passing through all the points A,B and C is a defined curve of a certain shape, then the angle of the ski blade must be constant at all times during the skier's passage along that curved path - irrespective of the angle of the skier to the boat. The angle of the rope changes, but the skiers blade angle must surely remain constant if he maintains a curved path of constant curvacture.

What do you want me to clear up about the left shoulder movement? I only made the point that the idea that the left shoulder remains "fixed" in space as the center of a circle with a fixed radius is not what happens in a "real life" golf swing in the late downswing - because i) the left shoulder socket is moving upwards, leftwards and backwards in the late downswing and ii) the distance between the left shoulder socket and the clubhead constantly changes as the clubshaft becomes progessively more in-line with the left arm in the late downswing.

Jeff.