Re: ShopTalk: 20 min talk

[Graham Little]

Bernie   Yes it appears that that's what's happening. I guess the size of the decrease in acceleration and the degree to which the shaft straightens or bends back is what has surprised me. Overall, it appears that the affect of the head striking the ball has quite an affect on the head first and then the action of the shaft later as it recovers.   It forces me to rethink some of the basics that I have been assuming during fitting. For example, if a strong player has a shaft that is too soft there is a tendancy for the shots to hit higher and more to the left as the shaft bows forward and closes slightly. So, this would indicate that the shaft has bowed froward quite dramatically prior to impact and is not quite straight at or just after the instant if impact. Also, what about the head twisting at impact? It's hard to see in the pictures but could the face open slightly as well? Therefore, the torque of the shaft may be having more of an effect on the direction and trajectory than I would have thought previously.   Sorry for the ramble, it just interesting to me.   Cheers Graham   ---- Original Message ----- From: Bernie Baymiller To: [EMAIL PROTECTED] Sent: Tuesday, January 21, 2003 9:19 AM Subject: Re: ShopTalk: 20 min talk Graham,   Several of the full-swing BJ photos show the shaft is actually bending forward before the clubhead strikes the ball. Then, the impact does indeed reverse the bend before it rebounds forward again. Think I also sent you a couple of BJ's acceleration/velocity circle graphs. They'll give you some numbers on the "negative" acceleration...and note how the shaft rebounds from the negative to the positive as the ball leaves the face. Velocity drops about 40'/sec at impact and acceleration goes a couple thousand feet/sec/sec negative before it rebounds to about zero. Guess that's the shaft suddenly bending back at impact. Might be something to add to your talk.   Bernie Writeto: [EMAIL PROTECTED]     ----- Original Message ----- From: Graham Little To: [EMAIL PROTECTED] Sent: Monday, January 20, 2003 7:02 PM Subject: ShopTalk: 20 min talk I've taken up Tom Wishon's suggestion about preparing a 20 minute talk about what happens when the club strikes the ball and I've been doing a bit of homework. Bernie sent me a series of photos that show the full swing including the point of contact. Thanks for the photos Bernie. One of the more interesting things about two of the photos is the fact that the shaft bends back at contact. We are used to seeing photos of the shaft bending forward slightly just before impact. However, these photos show that the shaft is not just straightened at the point of contact it is actually bent back. Will this have any affect on the ball flight or is it too late to matter? Do we have to rethink issues like the shaft flex taking this into account?   Any comments? Does anyone have other photos of this sequence that may shed some light on this matter?   Cheers Graham