quote:
Originally posted by jim_0068
Stumper...
The clubhead is moving up, but all your centrifugal force (swinging) or muscular thrust (hitting) is moving down plane. You cannot have a delofted clubhead unless you are striking the club with some sort of descending strike.
HOWEVER
The clubSHAFT is going to "kick" into impact and this can distort the readings of launch monitors and show the "ascending" path. This is a fact.
Please see this video of Ernie El's hitting driver from
www.lynnblakegolf.com and you'll clearly see a clubhead that is still going "down" to its lowest point of the circle before it begins to move back up. Here is the link:
http://www.lynnblakegolf.com/Video/ErnieEls.wmv
Jim, check the angle on that video again. it's in front of him, toward the target, Ernie does NOT tee up his driver rear of the middle of his stance. it makes it look like he's hitting down when it's just moving left. And for the record, I just went through it clicking frame by frame like 6 times and between the camera angle, poor quality, low frame rate, and the shadows, you can't see enough to make any sort of determination that's unbiased. Most TV footage is infact offset forward like that. (Edit: I just saw the insert at the end. It looks dead level to me. just look at the space between the bottom of the club and the bottom of the frame between impact and seperation...the relationship doesn't change.)
I'm still the only one with digital information recording the path of the clubhead. We can both show pictures of players that look like they're doing either this or that, but get me solid data and I'd be more impressed.
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A readers digest version of the physics of the arguement (and they really can not be argued) - hitting down is shorter, but more accurate (the accuracy increase is from the increase in backspin, which lessens the effect of sidespin). Hitting up is longer, but less accurate (again due to the decreased backspin).
The way the game is played at the highest level is simply hit it as far as possible, leave yourself the shortest approach possible, put it on the green, 8 iron from the rough is better than 6 iron from the fairway...and thus it is advantageous for them to hit up.
At the more common level, people generally NEED MORE backspin. Both to keep the ball more on line and to keep in in the air longer, and thus most amateurs would be better off hitting down. It'll cost them a few yards, but they'd be in less trouble more often
I hope we can all agree on the last 3 paragraphs.
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Birdie Man -
I haven't been nearly as clear about my feelings on a flat left wrist on this thread as I was on another. Simply put, I don't beleive a flat left wrist is important in proper ballstriking, it is ESSENTIAL...THE essential to ballstriking. Important just doesn't quite cover it. Compression leakage is bad. That being said, ALL spin is a form of compression leakage, as it is the result of a glancing blow. Now due to the aerodynamic effect of a golfball, you need spin to keep the ball in the air longer, not nearly as much as some people think though. Why would you choose to increase spin beyond optimal numbers and take away ballspeed by hitting down? And make no mistake, the more glancing a blow, the less ballspeed (it's the reason why a +1" 7 iron will have less ballspeed than a standard length 5 iron). I hope that clears up my arguement for you.
I really believe CHIII HAS to be atleast hitting level, if not up in that picture. Look at the height of the clubhead vs the equator of the ball. If he keeps going down from there, he'll be putting a horrible skymark on the crown of his driver. Either way. Can we agree that static pictures, or even TV footage, doesn't provide the necessary framerate to truly judge the angle of attack? That Konica Minolta Swingvision camera is the only thing that comes close.
I like your post, it was suprisingly well thought out. That being said, NONE of you have addressed any of my points. Here they are one more time:
1. The Shaft on that MATT reading was NOT kicked forward, as proven (see earlier post for explanation) by the effective clubhead loft at impact and clubhead angle.
2. Forward shaft lean and downward angle are NOT the same thing, as shown by the earlier experiment
3. Hitting up produces longer drives (it's a fact of physics, an object will accelerate in the direction in which force is applied to it - please oh please let someone mention Newton's third law to try to refute that...I'm begging you, anyone)
4. PGA Tour pros are exibiting an average 3 degrees ascending blow into impact, according to the Titleist Tour dept.
Anyone catch the Konica Minolta swingvision of Tiger yesterday?? definitely hitting up.
Also, Isaac Newton DID invent classical physics and DID invent calculus. While both have been expanded upon advanced and improved since that time, he is the father of both. Our knowledge of this world and the universe was advanced more by Isaac Newton than by any other person.