Golf YVR @golfwithlee - Tumblr Blog

View this post on Instagram

#ReasonILive (at Vancouver, British Columbia) https://www.instagram.com/p/CCgdvuXFJ4k/?igshid=lh020myw0s1f

I do struggle to find an appropriate response when faced with # white lives matter or # all lives mattter especially from those within my social media circle. Do I simply unfriend and unfollow - knowing that their view might become amplified within their ever-shrinking, like-minded group? Or do I speak up - potentially inflaming their views? I came across this cartoon strip by Kris Straub that brilliantly illustrates what I always wanted to express. I don't intend to argue with you if you disagree. This is my small way of speaking up and to tell you that there are many people, including myself, that does not agree with you. "All lives do matter. but lives in mortal peril need more immediate consideration than those that aren’t." - Kris Straub #blacklivesmatter https://www.instagram.com/p/CA9dcVxFZ14/?igshid=1lj8sotlgs3er

#blacklivesmatter

Happy 26th 😉😉 Birthday sweetie. I swear I was gonna get you the handbag you wanted but the shops are all closed... 😏. I mean 😭 #OnlyMyLuvThisYear #쪽쪽쪽 (at Richmond, British Columbia) https://www.instagram.com/p/CAUjtwdl44S/?igshid=igjspvwh8wp2

#onlymyluvthisyear #쪽쪽쪽

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 the 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. https://www.instagram.com/p/CABDGCylZXA/?igshid=1p4vbdmm4i937

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 the 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. https://www.instagram.com/p/B_7-qGtJO5S/?igshid=1u65f3q7slca

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. https://www.instagram.com/p/B_7qOx5lXIC/?igshid=1lomnsa16fhh8

Phenomenon of friction reversal during the impact interval on non-perfect interface Topic 1: Impact interval physics – how is it measured and studied. How does friction reversal work? 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. Watch the full conference www.golfscience.org https://www.instagram.com/p/B_5kT2xF14B/?igshid=1pylm2rqhpmdc

-A Summary from the World Science Congress of Golf Video Conference April 2020- 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. https://www.instagram.com/p/B_5j5utFYiT/?igshid=1uuht3kl7pfgu

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. https://www.instagram.com/p/B_39F26JbJd/?igshid=1r6r1jv7y97sd

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. https://www.instagram.com/p/B_33ePmpZ1H/?igshid=1deo0hax21pmm

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. https://www.instagram.com/p/B_32ynApq5M/?igshid=150kb894vbnox

I do Force-Velocity Profiling to look for force- and/or velocity-deficient in my clients' fitness level. For those fitness professionals, I use video based CMJ method using four loads (body weight, 15% BW, 30% BW, and 45% BW) to look for any bias towards either force or velocity. I know it looks like a bad 90s instruction video but I created a simple to follow 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 improve Speed-Strength (velocity). #PlayingThrough #golf (at Vancouver, British Columbia) https://www.instagram.com/p/B-8h5K8pF5K/?igshid=1vpg2b12z52nx

#playingthrough #golf

One more hardware for the office ✌ #TPILevel2 #PlayingThrough #whatsnext🤔 #dontstopmenow (at Vancouver, British Columbia) https://www.instagram.com/p/B-OMCtQFpiq/?igshid=jcj80pjrdggm

#tpilevel2 #playingthrough #whatsnext🤔#dontstopmenow

The bright side of #COVID_19 is that I finally have some time to catch up with #family and #education. 8 certificates in 4 days. #mybrainisonfire🔥 #PlayingThrough @mizunogolfnorthamerica @cobragolf @callawaygolf @titleist https://www.instagram.com/p/B-EGqlBFGLa/?igshid=au7g0rqxgu4h

#covid_19 #family #education #mybrainisonfire🔥#playingthrough

Dear Students, We are currently closed for all onsite lessons March 18th – 31st. In response to COVID 19 we feel this is what we need to do to protect the interests of our staff and students. Please contact our centre to speak to a coach or our Centre Manager at: (604) 370 -0493 or by email at: [email protected] If weather and access permits, we will be trying to carry out Play Lessons, and Short Game sessions when possible during the above-noted closure. We apologize for the inconvenience but appreciate your understanding. Stay healthy and stay safe. Lee J.H. Lee Centre Manager GOLFTEC Richmond Centre O: 604.370.0493 (at Richmond, British Columbia) https://www.instagram.com/p/B-APL7ClpYh/?igshid=1blqhv54xi01t

We are hiring at our Richmond location! DM for more info. (at Richmond, British Columbia) https://www.instagram.com/p/B0XtPb4F_qY/?igshid=1nfwht6ypnqao

We are hiring! #GolfProsWanted #GOLFTEC #Richmond #BC #Canada #PGA (at Richmond, British Columbia) https://www.instagram.com/p/B0XsOWXFSBU/?igshid=ymf84tr1kd5k

#golfproswanted #golftec #richmond #bc #canada #pga

Trending Blogs

Recently Viewed Blogs

Golf YVR