[MizunoJoe]

Originally Posted by MizunoJoe

I agree that from Impact to Separation, the butt of the club must be connected to the ground, but no more mass is needed than that required to keep the butt of the club from backing up.

So, who is going to compute the mass needed, if a driver, 44" is used and the swing speed (head speed?) is 100 mph?

It won't be me, but I think it's a lot less than many think. 135 lb Hidemichi Tanaka has the highest or 2nd highest ball speed ever measured by Taylor Made.