Post by dubiousgolfer on Jul 10, 2017 18:34:02 GMT -5
Dr Mann
I am having problems understanding the relevance of the coupling point when considering the 'turning moments' being applied to the club shaft by PP1 pressure forces (via the base of the right thumb).
Isn't the left wrist the fulcrum of the '2nd lever' of the 'double pendulum'? And if yes, any pressure force via PP1 below that fulcrum will cause a 'turning moment' = Force x distance (ie. distance from 'Pressure Point 1' to 'fulcrum point< left wrist joint>' ). So won't PP1 pressure force cause the club to rotate around the fulcrum (left wrist joint)?
You have stated below that "Pressure point #1 is located above the coupling point, and any push-pressure pressure applied here will not rotate the club-around-the-coupling point. But the coupling point is not a fulcrum so why is it referred to?
Further , I thought PP1 is also used in extensor action to keep the left arm 'comfortably straight' (in the backswing) using turning forces that also dorsi flex the right wrist enough to support the LFFW on plane. So could this same extensor action still be in operation in the downswing , enough to prevent early release of PA2 (ie. a slight negative wrist torque) or interfere with the timing and fluidity of the CF release?
Point number 1 is pressure point #1, and it is located over the aft side of the left thumb where the right midpalmar crease rides over the aft side of the left thumb. Pressure point #1 is located above the coupling point, and any push-pressure pressure applied here will not rotate the club-around-the-coupling point. A golfer may selectively decide to apply a right arm/hand force at PP#1 in order to assist in the fluid release of PA#4 and thereby help maintain the forward momentum of the left arm in the downswing, or a golfer may selectively choose to apply a right arm/hand force at PP#1 during phase 3 of the downswing in order to assist in the efficient/fluid release of PA#3.
I am having problems understanding the relevance of the coupling point when considering the 'turning moments' being applied to the club shaft by PP1 pressure forces (via the base of the right thumb).
Isn't the left wrist the fulcrum of the '2nd lever' of the 'double pendulum'? And if yes, any pressure force via PP1 below that fulcrum will cause a 'turning moment' = Force x distance (ie. distance from 'Pressure Point 1' to 'fulcrum point< left wrist joint>' ). So won't PP1 pressure force cause the club to rotate around the fulcrum (left wrist joint)?
You have stated below that "Pressure point #1 is located above the coupling point, and any push-pressure pressure applied here will not rotate the club-around-the-coupling point. But the coupling point is not a fulcrum so why is it referred to?
Further , I thought PP1 is also used in extensor action to keep the left arm 'comfortably straight' (in the backswing) using turning forces that also dorsi flex the right wrist enough to support the LFFW on plane. So could this same extensor action still be in operation in the downswing , enough to prevent early release of PA2 (ie. a slight negative wrist torque) or interfere with the timing and fluidity of the CF release?
Point number 1 is pressure point #1, and it is located over the aft side of the left thumb where the right midpalmar crease rides over the aft side of the left thumb. Pressure point #1 is located above the coupling point, and any push-pressure pressure applied here will not rotate the club-around-the-coupling point. A golfer may selectively decide to apply a right arm/hand force at PP#1 in order to assist in the fluid release of PA#4 and thereby help maintain the forward momentum of the left arm in the downswing, or a golfer may selectively choose to apply a right arm/hand force at PP#1 during phase 3 of the downswing in order to assist in the efficient/fluid release of PA#3.