Vancouver Golf with Lee
9751 Bridgeport Road, Inside Golf Town V6X1S3 Richmond, BC, Canada

Smile Jim. You just won a tournament :). Good work #11YearsOld

Phenomenon of ball launching outside the D-Plane model What does it mean?... D-Plane, in its most simplified explanation, is a model for understanding the starting direction, the spin axis and the lift of the ball flight. There are instances where the ball flight is outside of the predicted path of the D-plane model. Why does it happen? Non-center contact: On the vertical plane, It is rare to see a ball launching outside of the D-plane. However, there is more statistical noise on the horizontal plane and data sample is not usable if face-to-path is greater than 1.5 degrees and/or 0.25 off center. Measurement error: Even a quarter of a degree could knock balls off the D-plane and some people may be relying on the measurement device more than what they are capable of. Simple explanation: D-plane is a good starting model but it is not a perfect representation of what actually happens. Even if all variables of the D-plane model can be measured, there are many other factors such as friction and non-center contact that are not accounted for in the model.

Smile Jim. You just won a tournament :). Good work #11YearsOld

A Summary of Golf Swing Biomechanics Video Conference from World Scientific Congress of Golf - April 2020 Topic 1: Impact interval physics how is it measured and studied. How does friction reversal work? Phenomenon of friction reversal during the impact interval on non-perfect interface... Although not a recent observation, the subject of friction reversal as it relates to the study of impact interval (the time in which the ball is in contact with the clubface) was discussed. What is friction reversal? Instances of higher spin generation when grass or water were introduced between the club and the ball. Such phenomenon usually occurs when the spin loft is 35 degrees or less. What does it mean? Flyer lie generally creates a higher trajectory shot with less spin due to grass/water coming in contact with the clubhead before the ball. Contrary to that belief, the study documents instances of higher spin rate than under ideal dry conditions when the spin loft is 35 degrees or less (generally 5 iron loft or less). Simple explanation Grab then slide vs. slide then grab In a dry, perfect condition, the ball generally grabs onto the grooves first then slides up the clubface as it spins. But when the ball slides up the clubface as it oscillates, and then grabs onto the groves later in the impact interval, the spin rate tends to be higher. How is it measured? A mathematical model can calculate how different types of friction (static, rolling and sliding) is applied to the different surface area of the ball as the ball is compressed and warped during the impact interval.

Topic 2: Does measuring the golf club's moment of inertia about a fixed location on the grip produce misleading force and torque values when using inverse dynamics? What does it mean? There are numerous forces acting on the club, hands, fingers, palms, etc but they cannot all be measured accurately even with the latest technologies. Only way to measure is through inverse dynamics to calculate the net force of all the forces then by choosing a particular point, whether it be t...he center of wrist or the shoulder, to compute the net torque around that point. Why is this important? I believe there are few layers to the intention of this question. First, it stems from coaches' (non-scientists) attempts at quantifying the feel and the difficulty of a move during a golf swing. This, however, is not possible because you would then need to clearly define what particular muscle is feeling the effort of the swing at a given moment. There are simply too many muscle fibers to account for all. Calculating the kinetics relative to the center of rotation or the axis of rotation in order to quantify the difficulty of a motion is also a false notion. The motion of a 3D object, like a golf club, cannot and does not have a point of rotation that represents the whole motion of the object. It is possible to calculate it but it does not provide any meaningful data. For example, if a putter is moving in such a linear way that axis of rotation could be 16,000 feet in the air but it doesn not make the putter any difficult to move. Secondly, my understanding is that there is a fundamental disagreement among some coaches as to the functions of the hands couple (Dr.Sasho’s explanation of what couple is vimeo.com/158419250) and its role during the transition and during the impact phase. The problem can be cleared if there is a way to accurately separate and measure the different forces acting on the handle. Of course, there is no such device invented at this time. How can it be solved? A grip force system, as suggested by Dr. Kwon, that can give accurate data on the kinetics on the handle of the club, if invented, could revolutionize the dynamics of golf biomechanics.

Phenomenon of ball launching outside the D-Plane model What does it mean?... D-Plane, in its most simplified explanation, is a model for understanding the starting direction, the spin axis and the lift of the ball flight. There are instances where the ball flight is outside of the predicted path of the D-plane model. Why does it happen? Non-center contact: On the vertical plane, It is rare to see a ball launching outside of the D-plane. However, there is more statistical noise on the horizontal plane and data sample is not usable if face-to-path is greater than 1.5 degrees and/or 0.25 off center. Measurement error: Even a quarter of a degree could knock balls off the D-plane and some people may be relying on the measurement device more than what they are capable of. Simple explanation: D-plane is a good starting model but it is not a perfect representation of what actually happens. Even if all variables of the D-plane model can be measured, there are many other factors such as friction and non-center contact that are not accounted for in the model.

A Summary of Golf Swing Biomechanics Video Conference from World Scientific Congress of Golf - April 2020 Topic 1: Impact interval physics how is it measured and studied. How does friction reversal work? Phenomenon of friction reversal during the impact interval on non-perfect interface... Although not a recent observation, the subject of friction reversal as it relates to the study of impact interval (the time in which the ball is in contact with the clubface) was discussed. What is friction reversal? Instances of higher spin generation when grass or water were introduced between the club and the ball. Such phenomenon usually occurs when the spin loft is 35 degrees or less. What does it mean? Flyer lie generally creates a higher trajectory shot with less spin due to grass/water coming in contact with the clubhead before the ball. Contrary to that belief, the study documents instances of higher spin rate than under ideal dry conditions when the spin loft is 35 degrees or less (generally 5 iron loft or less). Simple explanation Grab then slide vs. slide then grab In a dry, perfect condition, the ball generally grabs onto the grooves first then slides up the clubface as it spins. But when the ball slides up the clubface as it oscillates, and then grabs onto the groves later in the impact interval, the spin rate tends to be higher. How is it measured? A mathematical model can calculate how different types of friction (static, rolling and sliding) is applied to the different surface area of the ball as the ball is compressed and warped during the impact interval.

Michael Finney, Director of Instruction at the University of Louisville GC, has brought together the brightest minds in the golf research industry to discuss the latest and the ongoing findings from the golf biomechanics community. You can watch the panel discussion in its entirety by making a donation through the World Scientific Congress of Golf (https://www.golfscience.org/donate-to-golf-science/). In the following posts, I'll share what I understood from the event but be ...warned that I understood only a small fraction (if not any at all) of their discussion. FYI, I’m not a journalist nor a biomechanist. I encourage all to view it for yourselves. There were a great number of issues discussed and I will break them down into smaller chunks of information and share it bit by bit. Golf Researchers: Phil Cheetham, Ph.D. Biomechanics; Mike Duffey, Ph.D. Biomechanics; Bob Grober, Ph.D. Physics; Erik Henrikson, Ph.D. Aerospace Engineering; Young-Hoo Kwon, Ph.D. Biomechanics; Scott Lynn, Ph.D. Biomechanics; Sasho Mackenzie, Ph.D. Biomechanics; Art Maffei, MS Systems Engineering; Rob Neal, Ph.D. Biomechanics; Dieter Olson, BS Chemical Engineering; Dave Tutelman, MS Electrical Engineering; Paul Wood, Ph.D. Mathematics.

I use Force-Velocity Profiling to look for force- and/or velocity-bias in my clients' fitness level. For those curios, I use video based CMJ method using four loads (body weight, 15% BW, 30% BW, and 45% BW) to look for any deficiencies. I know it looks like a bad 90s instruction video but I created a quick video for those clients that have not done the test so they are aware of what to expect in the future. I also included some home exercises that they could do at home to imp...rove Speed-Strength (velocity). For full video, Youtube link in the bio. #PlayingThrough #golf . . . . . . . #golfswing #golfinstruction #golfcoaching #golflesson #instagolf #tigerwoods #golfstagram #golfgram #golfer #golftips #vancouver #pga #pgatour #golfpro #golfdigest #golfchannel #golfgods #golfaddict #golfing # # # # #fitness #golffitness See more

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Watch this 10 year old recoil and re-fire mid-impact! He opens up his hips to 44 deg then recoils to 25 deg a moment after impact. Notice his right hip suddenly changes direction then continues to rotate. Simply amazing. Congrats to Jim for qualifying for the Callaway World Championship. He will also be representing Canada at the upcoming US Kids World Championship. #GOLFTEC #GolfTown #GolfwithLee

#TeamHonma in the house Thanks to Laird and Joakim for taking some time away from Tour #golfgods last couple days to improve us mere mortals @GolfTown #5StarLevelUp #Honma #HonmaGolf #GOLFTEC

#HappyWomensGolfDay #KeepCalmAndSwingOn

Join us this weekend for our Richmond Grand Reopening! First 100 guests on Saturday will receive a $50 gift card and first 100 guests on Sunday will receive a special gift pack.

Did you know there are more than 80 golf courses, driving ranges, golf retailers and learning facilities in the lower mainland BC? We have a complete list of them. Pick up a copy at GOLFTEC centres (there are 5 locations in Metro Vancouver )... #GolfBC #GolfVancouver

There are many layers to probe in the Canadian’s past, from his improbable success to his quick vanishment. But now, in the present, only one question comes to mind, and #MikeWeir knows it too: Why is a #Masters champion playing on the #Webcom Tour? https://www.golfdigest.com//why-is-mike-weir-a-masters-cha