[BerntR]

The arms and the club can be said to have the same RPM if you look at it in the "right" way. This has been discussed recently. But they really don't. At the top, the club is lagging around 90 degree behind the left arm. And at the end it is leadning with around 90 degree. In a good stroke most of the overtaking will happen close to impact. The cocking and uncocking of the left wrists "absorbs" a 180 degree difference if the recommended single action grip is used. And most of this is absorbed close to impact.

The single action grip - where the left hand is only allowed to do a vertical hinge is a key in monitoring and controlling the overtaking. A double action grip - where both hands are allowed to bend and arche and cock and uncock is physically very effective too, but it is too flexible to provide clubhead and clubface control.

If the club and the arms travelled at the same RPM, flipping would be a non-issue.