[Bagger Lance]

Jeff,

There is really nothing that continued acceleration can contribute to ball speed over the half-millisecond impact interval.

Zin14

Intuitively that makes sense, but I still have nagging questions.

Driver manufacturers can and do build "spring effect" into the clubface in order to boost the rebound. That probably has nothing to do with this topic, but it highlights the importance of the impact interval on ball behavior.

The ball is hitting the clubface as hard as the clubhead is hitting the ball, so the clubhead slows down during and past impact. Is it possible to resist clubhead deceleration (mph)?

What about the long lever? With a locked flat left wrist at impact, you are bringing the entire primary lever (left arm and clubshaft) into impact with the massive rotor still pulling. This isn't something that is well duplicated on a simple swing machine with a flail hooked up to a clubshaft.

Do you have any data or experiments to defend the impact statement? I know there is a lot of heresay, but I've yet to see data that has been examined and approved by multiple recognized scientific sources in the golfing community. Would love to see it if you can share it.

Along those lines, I've yet to see any published materials disproving materials in Chapter 2, but there is also a lot heads nodding that much of the 40 year old material has been debunked. That may be true, but lets bring those scientific studies out in the open. I'm sure Homer would be happy to have more precise data added to what has been written.