[BerntR]

If you have a an endless belt with a club attached, ref 2-K, the belt will have a constant speed of course, and the club will have the same speed during linear travel and greater speed in the curve. The smaller the pulley is, the more speed the clubhead will pick up.

However, if the belt carried no mass and the system were simply freewheeling, and the only thing that carried mass was the clubhead, the clubhead would have constant speed and the belt would slow down around the corner and pick up speed on it's linear travel.

There is no magic trick here that suddenly increases the clubehad speed. You have to do speed up the club with your hands. So what you're ideally looking for is a pulley size that lets you apply max force for as long as possible. Larger pulley will let you apply power longer, smaller pulley size will probably get you closer to your max power but not let you apply it for very long.

If you swing a shaft without a clubhead you will get max swing speed with a very small pulley. If you swing a very heavy club you will max the speed with a large pulley. How heavy a club feels depends on how strong the golfer is. Therefore I believe that the optimal pulley size is different from golfer to golfer.