[neil]

According to Cochran and Stobbs (Search for the perfect swing) there are 5 factors at impact which can affect the flight of the ball. In discussion with a few other pros recently a colleague suggested that a sixth law may have been overlooked by cochran. He suggested that loft at imact (dynamic loft) is another to join Face angle, clubhead speed, path, angle of attack, centredness of strike.
Any thoughts on this?

Not read the book but I would say that loft at seperation and clubhead speed at seperation together with hinge procedure would be major factors -assuming the swing is on plane.