But the better question (and un-answered IMO) is how much does the torque of the shaft actually influence the face rotation from an off center impact - during the time the ball is still in contact with the face? We're pretty sure it doesn't noticeably help for the full swing - but that doesn't necessarily mean it can't for the putter. The only actual data I saw from the BGT folks (the graph of heel and toe velocity) and it only showed differences 'long' after impact and after the ball is gone.
Wouldn't the graph by BGT, whether after or during contact, indicate less stability after being hit from oscillation mean less energy transferred into the ball during? Also, the oscillations on the steel shaft graph go from 15 to 25 frames past initial impact taken at 2500 frames/sec. or between .006 - .01 seconds from initial impact.
Not really. The amount of deformation can amplify the consequences of instability. So just because there is noticeable instability at the higher deformation doesn't tell us how much there was at lower deformation amounts.
And impact from a full swing only lasts ~0.004 sec. I haven't seen any data about how long it lasts with a putter stroke - but considering there is significantly less compression of the ball, I would not think it would be significantly longer.
Edited by Stuart G., 10 October 2018 - 11:46 AM.