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  1. Agreed. I'd also believe it's mostly weight vs aerodynamics, but not sure if anyone's done a test with a speed stick built the same as a driver (length, total weight and swingweight). Guessing the aerodynamic drag difference won't add to much speed difference as 460cc heads don't seem to be much slower vs smaller heads at the same length, but haven't seen a comparison. Shameless plug for my post on swinging speed with other clubs... I'm surprised the weight differences (also torque around the butt) didn't give speeds that varied much from the chart speed numbers for me in actual testing:
  2. Could be that you've "grooved" yourself to similar speeds despite the club length differences? I can only speak for myself, but found a similar thing before putting some effort into speed training. Got so used to partial/knockdown swings that I looked slow on video on full swings and wanted to swing more freely. YMMV but best of course to have an instructor take a look.
  3. Saw this related to a baseball bat weight study. Not critiquing, just food for thought: If we warm up with the heavier (total weight, not swingweight) short clubs on the range - wedge and irons before getting to driver - are we doing a disservice to our driver speed when we get to driver? Could be we should swing a lighter stick or take some swings with the driver flipped holding by its hosel first before hitting driver.
  4. I've been stuck inside due to winter weather but have been wanting to test swing speed because of reading about speed training, watching Dr. Kwon etc. The best I can do at home are shorter clubs and driver choked down 2" getting dangerously close to my attic roof lol. I posted this chart in another thread that got moved to the WRX Tech club builder forum, but this post is about speed testing... not building or training. It's been accurate for me in predicting swing speeds of all clubs by just swinging a sand wedge for instance (despite weight differences). Ramping up to true max swings with a wedge is weird at first, and not recommended for golf, but can actually indicate your driver speed if you can't swing driver indoors. Clubhead speeds topping out so far using PRGR radar: - Sand wedge 35": 95 mph <- predicts 45" driver at 122 mph and 4 iron at 105 - 4 iron 38.5": 105 mph <- correctly predicted by wedge; predicts 45" driver at 123 - Driver choked to 43": 119 mph <- predicts 45" driver at 124.5 - It does seem that since clubs get lighter as they get longer, the speed progression may be a little higher than the chart indicates, but not by much. Maybe +2 mph from wedge to driver for me so far. - I'm building a 43" 3 wood soon which is heavier than driver, and will see what speeds I get. Would love to hear if others find similar results. Find your approx. driver swing speed in the chart, and see the correlated speeds for other clubs based on club length: Explanation here: https://forums.golfwrx.com/topic/1848507-swing-speed-vs-club-length-math-only-update/ The old PGA Trackman numbers definitely don't see them swinging with driver effort on short clubs.
  5. There's been some cases in pro bags like Langer. It could be a visual thing, like offset preference. It could be a weighting vs length issue. For instance wanting to feel a little heavier on the shorter clubs that get more partial swings. Or it could be flight preferences, head CG related, while maintaining consistently with the "harder to hit" longer clubs. I've found a liking for GI wedges (CBX) combo'ed with more compact players irons. Have even had a blade 3 iron at one point as a tee club with the reverse combo (have a blade 1 iron to try for kicks when it warms up because it's unbelievably awesome at the range lol).
  6. Helps to show that good players certainly raise the handle vs address - in a controlled manner due to natural swing dynamics vs ams that may have some kind of faulty handle raising problem. And hand position at impact vs address is way more prominent than toe droop is to the dynamic lie.
  7. A suppressed inner ho lives vicariously through WRXers who do all the spending Seeing great reviews of my current old clubs helps. And pulling off all the shots, distances, shapes needed.
  8. Got about 8° difference from address to impact from your swing vid: FWIW Tiger had 5° difference here: Ryan Moore, who has the lowest hand address I can think of, came out to 13° difference! Not suggesting swing changes to you, which looks pretty solid IMO, just showing observations of different swings from the DTL view. Bryson likely has the least difference with his single plane swing.
  9. So definitely do the ball marker test to see if dynamically you're getting vertical lines or not, on top of the upcoming fitting. From your pic I measured 11° toe up using the bottom of the picture as 0°. I want to share some pics showing how significantly different from address to impact the hand position can be. Tiger - I didn't measure but you can see left to right the shaft angle and hand differences (hands vs grass mow lines): Adam Scott - superimposed address and impact, measured 5° difference (from hosel to grip, toe droop will add even more): Collin Morikawa - superimposed, measured 9° difference (toe droop will add even more): Nelly Korda - superimposed, measured 5° difference (toe droop will add even more): Most will be like them - hands a little higher and towards the ball at impact. Collin might have his toe up close to you sometimes. Here are my static numbers, fellow shorty, toe up angles on right, but all ball markers come out close to vertical dynamically (never did ball marker on driver though, but the lower the loft the less the lie effect on starting line): I was surprised they were angled up that much; they look fine to me. But I understand the look of more upright clubs not looking right.... Hope you find your happy place. Maybe seeing vertical marks on the ball marker test will give reassurance that you're not far off. Bending plus choking down may get you there upon testing and fitting.
  10. I'm enjoying Dr. Kwon's content. There was one comment on the first page here on Shawn Clement's elephant walk drill which is what Kwon's step drill and weight drill above remind me of (sledge hammer drill too). Clement has also always taught to complete the backswing with the weight shift "behind you" as the back is pointing towards the target, which Kwon is advocating from his more technical side. If you watch Clement you know he's very repetitive with his references like a baseball player finding the ground, Happy Gilmore... and task-oriented queues like cutting a dandelion stem towards the target, etc!
  11. +1 Leaderboard is the most popular it seems: http://www.leaderboard.com/SWINGWEIGHT Okrasa is another: http://golf.okrasa.eu/clubs/swingweight-en/sw-measurement/ Excel calculator (I got identical readings to Okrasa, precise down to a decimal... vs Leaderboard which rounds to the nearest whole number and was a little annoying to me to have to let it settle on a number): Same inputs as online - total weight and balance point. Plus options to see the effects of adding/subtracting weight anywhere, and choking down or extending. The math is the same as a scale's math. It's just faster and easier with a real scale.
  12. Got something cool for you to check out. That fast eccentric is something I do to mix up some exercises like pushups and ab wheel, because of the limited triphastic stuff I've seen. Velocity trackers are way too much $$, and I figured after seeing your post that there should be an app around. Looked up accelerometer and downloaded this one: Physics Toolbox Accelerometer. Strapped my phone to my chest with one of those elastic resistance bands LOL... Recorded in linear accelerometer mode, and plotted in Excel. I just used total instead of XYZ axes. Here are results of 10 fast concentric pushups followed by 10 fast eccentric pushups (trying to drop fast and catch at the bottom): It's a little wacky but I'm sure you could strap the phone (or smart watch?) to a barbell, or to yourself, to get readings for any barbell movement. OP, sorry if threadjacking. Might move to another thread, but figure gym speed training and swing speed training are related.
  13. Interesting. Heard of this from trainer Chris Barnard, Overtime Athletes. Eccentric, Isometric, Concentric. Ability to absorb force with eccentric. Hold force with iso. Create with concentric. He mentions GTO (golgi tendon) inhibition as a governor on speed. Heard somewhere else that may be not true... But in any case great athletic training by him in youtube IMO, and certainly has cred with his own vertical and pro clients.
  14. Totally, which is why I started a thread saying some people are just fast. Pointing to this article again, this world champ hurdler had unheard of Type 2x muscle composition: https://renaissanceperiodization.com/muscle-fiber-types-change-training-end-unfounded-debate/ The first found that bodybuilders (n = 8 contained more MHC I/IIa, MHC IIa than age matched physical education students; and MHC IIx were completely absent (21). The other was the only study ever to performed single fiber SDS-PAGE on an elite speed, strength, and/or power athlete found a world record holding sprinter Colin Jackson had an ASTONISHING 24% MHC IIx (video here)(31). How is this possible?! We don’t have a clue. Makes you wonder what would happen if people did biopsies on more people like this….
  15. That seems to be the case, mostly with hybrid fibers converting to pure type fibers and vice versa, though fiber plasticity is very much a thing and things get mixed metabolically. Article from Galpin: https://renaissanceperiodization.com/muscle-fiber-types-change-training-end-unfounded-debate/ The study of identical twins that he was part of is interesting. The "trained twin" (TT) that did endurance exercising for 30 years vs the "untrained twin" (UT) that didn't exercise had very different muscle makeup in the leg: https://www.researchgate.net/publication/326398362_Muscle_health_and_performance_in_monozygotic_twins_with_30_years_of_discordant_exercise_habits High Type 1 as you'd expect from endurance exercising (jogging, biking). Interestingly higher Type 2 fast twitch is seen more in sedentary people - which is what we're all after for swing speed. Maybe we should never train
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