ByeByePoly
G.O.A.T.
Theory ... FHs are made up of:
1) double pendulums
2) old style slingshot (my term ... sure there is a technical term out there ... need better term) EDIT: calling this Elbow Slingshot below.
3) other elements
Curiosity was describing double pendulum with his nunchuks, and I tried with golf Iron Byron.
If you have not read the link that Mntlblok provided to Rod Cross's TWU article on double pendulums, I highly recommend you do. It will be WAY more useful than what I am about to type.
http://twu.tennis-warehouse.com/learning_center/doublependulum.php
Following video link is from that article ... gives you a visual on what a double pendulum is. Note the baseball bat represents the forearm, and the dowel rod represents the racquet. Note the bat/forearm slows down near the bottom and the dowel / racquet speeds up.
double pendulum
http://twu.tennis-warehouse.com/learning_center/movies/doublependulum/LightRacquet.mp4
old style slingshot (pay off at 00:47 ... wow)
EDIT: dropped calling shoulder - upper arm a double pendulum
FH double pendulum:
pendulum 1 - forearm
hinge - hand
pendulum 2 - racquet
EDIT:
Two FH Double Pendulums: (for this thread)
Simple Double Pendulum: some release of pendulums angle by contact, no flip
Flip Double Pendulum: some release of pendulums angle by contact, and flip
Flip: for this thread, there is no such thing as a flip if there is not some release of the initial double pendulum angle.
Examples of old style slingshot:
- all FHs with bent elbow during forward swing (this varies from very bent (Sharapova) to some flex (Djokovic). The point of this analogy is the rotation of the forearm around the elbow (anchor) is a power source to consider in the variations of FHs.
Will post example video in pics in followup posts.
Discuss
1) double pendulums
2) old style slingshot (my term ... sure there is a technical term out there ... need better term) EDIT: calling this Elbow Slingshot below.
3) other elements
Curiosity was describing double pendulum with his nunchuks, and I tried with golf Iron Byron.
If you have not read the link that Mntlblok provided to Rod Cross's TWU article on double pendulums, I highly recommend you do. It will be WAY more useful than what I am about to type.
http://twu.tennis-warehouse.com/learning_center/doublependulum.php
Following video link is from that article ... gives you a visual on what a double pendulum is. Note the baseball bat represents the forearm, and the dowel rod represents the racquet. Note the bat/forearm slows down near the bottom and the dowel / racquet speeds up.
double pendulum
http://twu.tennis-warehouse.com/learning_center/movies/doublependulum/LightRacquet.mp4
old style slingshot (pay off at 00:47 ... wow)
EDIT: dropped calling shoulder - upper arm a double pendulum
FH double pendulum:
pendulum 1 - forearm
hinge - hand
pendulum 2 - racquet
EDIT:
Two FH Double Pendulums: (for this thread)
Simple Double Pendulum: some release of pendulums angle by contact, no flip
Flip Double Pendulum: some release of pendulums angle by contact, and flip
Flip: for this thread, there is no such thing as a flip if there is not some release of the initial double pendulum angle.
Examples of old style slingshot:
- all FHs with bent elbow during forward swing (this varies from very bent (Sharapova) to some flex (Djokovic). The point of this analogy is the rotation of the forearm around the elbow (anchor) is a power source to consider in the variations of FHs.
Will post example video in pics in followup posts.
Discuss
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