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Big Lex posted a topic in Geek ZoneThis stuff really intrigues me.....there is more real science out there on the golf swing than you might think. I started another thread for an article on movement variance....and then I found this article.....and then some others. So I decided to start a catch-all thread. Moderators feel free to add the other article to this thread if you think it's necessary. Anyway, to start the ball rolling..... Here is a link to a paper by Bob Grober, PhD. Bob is an adjunct at Yale's department of applied physics. He has done a lot of study on tempo in the golf swing, and even sold a product called "Sonic Golf," which was reviewed here in a Sand Trap thread. The paper caught my eye because we have noted in other threads the issue of variation in golf swings. The counter-intuitive or surprising finding that even crappy golfers have "repeating" swings has been noted. The recent thread on this showed a handicap golfer making two virtually indistinguishable swings, which produced wildly different results. In the paper there are three graphs which represent the swing duration measurements of three groups of golfers: Tournament professionals, teaching pros/high level amateurs, average/chopper golfers. I wish I could put the tables right in this post, but I can't. The essence of it is, however that the variability of backswing and downswing duration gets progressively greater as the skill level of the golfer decreases. Touring pros had extremely consistent swing durations, while choppers were all over the map, and the teaching pros somewhere in between. It's a good read. Most of the article is fairly basic (although beyond my immediate understanding....I was never great in physics) Newtonian mechanics, modeling the golf swing as a harmonic oscillator (HO). An HO is a system where a force is applied to a mass, which is connected to a spring, and the mass moves to and fro. The system is such that the duration of the oscillation remains THE SAME no matter how much force is applied. It's been shown that the duration of expert golfers' swings are basically the same no matter what club they play and often whether or not they are playing a full or a partial shot. In the biomechanical model, the Mass component is the club, the arms, and torse (maybe the legs too?), and the spring is the combination of biomechanical elasticity and the muscle patterns that govern the endpoint of the swing and the transition to downswing, etc. More geeky stuff for your reading pleasure.... Please feel free to add any studies in this thread that you think are interesting.
iacas posted a topic in Instruction and Playing Tipshttp://www.dstgolf.com/optimise-golf-swing/how-dst-golf-clubs-work You'll notice that everything in that description talks about how the shaft appears, or how a line appears, so that you set up properly. In essence, everything - the shaft being bent, the wide sole with a specific bounce, and the line near the hosel - is geared toward one thing: to get the handle forward at setup. As you can see, I've done that here in two swings: So far so good, right? I added a white line so that you can see the curve in the shaft. I will tell you that it appears to be more severe at setup. Unfortunately, the simple physics of swinging a golf club are that the heavy part - the mass at the end of the stick - wants to line up and form a straight line pointing at the center of the arc on which it's being swung. Consider tying a small weight to the end of a string. Swing it around: over your head, in front of you, beside you, on an angle… and you'll notice that the weight pulls the string tight. Simple physics. So, whether you flip or not, the weight on the end of the string (the clubhead) pulls the string (the shaft) taut. On the left, my weight is moving back and I'm throwing or flipping the clubhead. On the left, a "good" swing. This renders the DST a "visual" training aid only. It fails at doing much more than your clubs do already at letting you know whether you flipped at the ball or not. Here are the videos: