However , Duclos did recog nize that the club head face is not the leading edge of the air foil over much of the downswing .
assumption is made that the club face is the leading edge of the club head air foil .
Duclos did recog nize that the club head face is not the leading edge of the air foil over much of the downswing .
assumption is made that the club face is the leading edge of the club head air foil .