[BerntR]

A little thinking will show that the only part of the club that can be on plane in the Impact Interval is the Sweetspot, while the shaft is below the plane.

Your examples are the opposite of what you think. Hogan is pulling from release all the way to his anatomical limit at the finish, while Donald is throwing the arms/club through Impact with his Right Shoulder.

If the hands are under the plane through impact it will be by a very small margin due to the huge ratio of ch speed to hands speed. If there is any serious acceleration going on during the release interval, the hands and sweet spot has to move towards a common plane. The ch speed to hands speed ratio dictates that it can't be otherwise. Slightly above, right on or slightly below are the only viable options - unless we talk about serious swing flaws.

Hogan wished he had three right hands so it goes without saying that he didn't purely drag the club through impact. He must have been applying a lot of pp#1/#3 through the ball. As far as Luke Donald is concerned, throwing is a very ambiguous term the way you use it to describe Donald's release & impact but no matter how I twist the meaning of the term, throwing plus raising the head before impact doesn't make any sense to me whatsoever.

The thing that intrigues me about this is that the hands to plane stuff seem to make a difference to club face control. Hands that are above the plane will make it easier to close the face towards impact, and sometimes it will make it too easy, ref the dreaded snap hook. Similar, with hands that are under plane early on - as with an OTT problem, the golfer will have big problems squaring the club face before impact.

Seems to me like hands above plane will promote a closing action while hands below plane will tend to keep the face open. Just not sure how it applies to good golfers in real life. Perhaps Daryl is right and that it has to be right on plane through impact.