Mark H you are correct. We are finding out kids gain power using this device. When they go from hitting off the T to soft toss, then you know they have it mastered.
is the whiphit bat compatible with those who use tom emanski's major league swing (i.e., combinational approach of rotational into linear) for hitting?
my hitting coach tells me my swing plane does not need to be parallel to my shoulder axis. he wants my posture with my shoulders more or less level, and tells me to reach with my arms up or down to go after the ball using the necessary angle to attack it. he emphasizes barrel above the hands and hands above the ball. obviously, depending on the height of the pitch, at contact the barrel may be below the hands tho.
i wish i were closer to you so i could do lessons Coach Guerry!
The shoulder action staying in there/not flying open is better thought of (for MLB pattrn) in Epstein terms of shoulder TILT with the back shoulder dropping by tilting action NOT just appearing to drop from rotation of the torso.
The arm adjustment action is also better thought of in Epstein's terms of the FRONT arm lifting more or less p off chest to create a "weathervaning" feel.
You do not want to encourage disconnecting action of the arms. The shoulder tilt and arm action (elbows retaining spacing as Epstein describes it) and forearm twist/swivel and hand action on handle/grip all need to promote staying connected to the unloading/uncoiling torso to keep the bathead accelerating to max speed at contact.