Very fascinating, thanks for posting TW. So much good information here. One thing it says to increase spin is to hit on the ball descent. I guess we should make contact when the ball first starts descending.
good discussion but I need to add one important thing: the ball deforms a lot so the R at impact changes. Theoretically the smaller R you have with the same sliding V, the greater RPM you can get and we are talking about easily 200% difference.
It does not matter. At the impact point it is still a straight path and a fixed speed. The arc/acceleration are more ways to get the better angle and speed at the contact point from the human body perspective
Very interesting topic! I was looking for Part 2 of this tutorial hoping that it would answer my question, but maybe it's not out yet? Anyway, I have a question for Professor Rod that I was wondering if he could answer or share his opinion on this topic. CASE: Stringing a hybrid setup with two polyester strings of different gauges. For example, the mains with 16g and the crosses with 17g. BENEFIT: Since the mains are the "playing strings," you get the durability from the 16g, and power from the 17g crosses. This setup would be more powerful than a full 16g setup and more durable than a full 17g setup. THEORY: Another benefit is more spin potential. 1) The thicker mains are "popping out" of the string bed more than the thinner crosses, therefore yielding higher string to ball friction. 2) The thinner crosses have less surface area, yielding less string to string friction, therefore allowing the mains to snap back more efficiently. QUESTION: In this case, would be be true that in this setup would have more spin potential compared to a full 17g setup?
In theory, yes, the hybrid gauge of the same string may have a bit more durability than a straight 17 setup. But the power will depend. Thinner gauge does not always mean more power. Theoretically it may deflect more and store more energy, but it also may get stiffer as it stretches because more stress is being put on a decreasing cross-section. It all depends on the string, how far it stretches, and at what impact tension it begins to disproportionately increase stiffness vs storing energy and not crushing the ball (which loses the most energy). In the end, the only thing that matters is the final stringbed stiffness at the hitting location. As to spin, any added ball-to-string friction won't matter because at all impacts less than 50 degrees, the ball bites the string and friction reaches its maximum and even starts to reverse, as explained in the video. At impacts above 50 degrees, the ball might slide throughout impact, so added ball-to-string friction will help in that case. Surface area in contact between strings is not a reliable indicator of friction. If "all other variables" are equal, including same string model, perhaps. But the thinner string may also notch the thicker main more and cause more surface area (bottom and sides). On hybrids, the best you can do is look at the coefficient of friction (COF) of the two strings and guess. We don't do COF on two different strings sliding on each other (way to many combinations to test). Sorry, Part 2 has not been done yet. It will deal with the "snapback" in more detail. It is a lot more nuanced than one might think. A good introduction to the subject is the TWU experiment "Spin and String Surface Roughness" (twu.tennis-warehouse.com/learning_center/spinandfriction.php).
@@tenniswarehouse Thank you very much for answering my question! It sure gives me something to think about now. Can't wait to see the Part 2 video on snapback!!
I don't know much about science but I got a gut feeling stencil ink helps spin and ball pocketing. Most grand slams are won my strings with stencils!!!
I usually use a hybrid setup with a multifilament on the mains and smooth polys on the crosses. How much more spin will I get if I used a textured/rough poly on the crosses instead of a smooth one?
I don't think that by changing to a textured cross string it will make a significant difference in spin. When mixing with a multi, I think the smooth polys work best for durability, and snap-back. Troy, TW
@Kyung Hoon Kim, There is so much info and more on TWU. This article might be a good place to start: twu.tennis-warehouse.com/learning_center/edgeeffect.php Michelle, TW
@@tenniswarehouse Tennis Warehouse Is the 1.8 of spin speed multiplier a constant? If it is a variable I’m really keen to know what are the contributors and the magnitude of impacts of those contributors. I came to bear this question because as I progress it feels like my spin production is increasing when my swing path is getting flatter. Tried to find any clue in the written articles but I couldn’t. Sorry, I know this might be too much of a question to be dealt in replies, but I just wanted let TWU know about my question since there’s no way to communicate to the university. Thanks again though for the great food for thoughts and please know that there are nerds who love everything the TWU does :^)
Feels like I'm watching a VHS science video back in 8th Grade in 1985. Sorry Tennis Warehouse guys this is absolutely awful. Could be so much better these days.
![ARGENTINA vs. CHILE [3-0] | RESUMEN | ELIMINATORIAS SUDAMERICANAS | FECHA 7](http://i.ytimg.com/vi/De3AWmXzhuA/mqdefault.jpg)
Love seeing the science, but man it's edited like a 2003 science video
probably actually is one
Who cares... It was informative
That’s why it’s good, substance over style.
I came here to say this. Feels like a 90s high school vhs
I actually liked it that way. Focusing on the important stuff unlike new vids, where everything is about editing
"This video was filmed before the Covid 19 pandemic" feels like it was filmed before the Covid 2009 pandemic too
Very fascinating, thanks for posting TW. So much good information here. One thing it says to increase spin is to hit on the ball descent. I guess we should make contact when the ball first starts descending.
Thanks. I was wondering why top players tilt the racket at contact. Can't wait to try it.
good discussion but I need to add one important thing: the ball deforms a lot so the R at impact changes. Theoretically the smaller R you have with the same sliding V, the greater RPM you can get and we are talking about easily 200% difference.
We never swing in straight but in a curvy path. On top of that, I always try to swing with an acceleration rather than at constant speed
It does not matter. At the impact point it is still a straight path and a fixed speed.
The arc/acceleration are more ways to get the better angle and speed at the contact point from the human body perspective
Seriously cool, noggin-shaking video. 💖 I haven’t had to sign up for remedial physics summer classes since 1994. 😄 Can’t wait for part II!
Very interesting topic!
I was looking for Part 2 of this tutorial hoping that it would answer my question, but maybe it's not out yet?
Anyway, I have a question for Professor Rod that I was wondering if he could answer or share his opinion on this topic.
CASE: Stringing a hybrid setup with two polyester strings of different gauges. For example, the mains with 16g and the crosses with 17g.
BENEFIT: Since the mains are the "playing strings," you get the durability from the 16g, and power from the 17g crosses. This setup would be more powerful than a full 16g setup and more durable than a full 17g setup.
THEORY: Another benefit is more spin potential.
1) The thicker mains are "popping out" of the string bed more than the thinner crosses, therefore yielding higher string to ball friction.
2) The thinner crosses have less surface area, yielding less string to string friction, therefore allowing the mains to snap back more efficiently.
QUESTION: In this case, would be be true that in this setup would have more spin potential compared to a full 17g setup?
In theory, yes, the hybrid gauge of the same string may have a bit more durability than a straight 17 setup. But the power will depend. Thinner gauge does not always mean more power. Theoretically it may deflect more and store more energy, but it also may get stiffer as it stretches because more stress is being put on a decreasing cross-section. It all depends on the string, how far it stretches, and at what impact tension it begins to disproportionately increase stiffness vs storing energy and not crushing the ball (which loses the most energy). In the end, the only thing that matters is the final stringbed stiffness at the hitting location.
As to spin, any added ball-to-string friction won't matter because at all impacts less than 50 degrees, the ball bites the string and friction reaches its maximum and even starts to reverse, as explained in the video. At impacts above 50 degrees, the ball might slide throughout impact, so added ball-to-string friction will help in that case.
Surface area in contact between strings is not a reliable indicator of friction. If "all other variables" are equal, including same string model, perhaps. But the thinner string may also notch the thicker main more and cause more surface area (bottom and sides). On hybrids, the best you can do is look at the coefficient of friction (COF) of the two strings and guess. We don't do COF on two different strings sliding on each other (way to many combinations to test).
Sorry, Part 2 has not been done yet. It will deal with the "snapback" in more detail. It is a lot more nuanced than one might think. A good introduction to the subject is the TWU experiment "Spin and String Surface Roughness" (twu.tennis-warehouse.com/learning_center/spinandfriction.php).
@@tenniswarehouse
Thank you very much for answering my question!
It sure gives me something to think about now. Can't wait to see the Part 2 video on snapback!!
Yo how did you guys find my 1998 physics class vhs
So... E=mc-nadal +contact velocity means Woah! 🤔👏🙄😁
I don't know much about science but I got a gut feeling stencil ink helps spin and ball pocketing. Most grand slams are won my strings with stencils!!!
Always blame your equipment. We all know that.
That very first swing -- yow
I usually use a hybrid setup with a multifilament on the mains and smooth polys on the crosses. How much more spin will I get if I used a textured/rough poly on the crosses instead of a smooth one?
I don't think that by changing to a textured cross string it will make a significant difference in spin. When mixing with a multi, I think the smooth polys work best for durability, and snap-back. Troy, TW
Would the Volkl Cyclone be worth it to hybrid with Luxilon Alu power?
Could potentially be a good hybrid for spin. Give it a try, and see what you think! Troy, TW
Interesting! Is there any written article corresponding to this video on the TWU website?
@Kyung Hoon Kim,
There is so much info and more on TWU. This article might be a good place to start: twu.tennis-warehouse.com/learning_center/edgeeffect.php
Michelle, TW
@@tenniswarehouse Tennis Warehouse Is the 1.8 of spin speed multiplier a constant? If it is a variable I’m really keen to know what are the contributors and the magnitude of impacts of those contributors. I came to bear this question because as I progress it feels like my spin production is increasing when my swing path is getting flatter. Tried to find any clue in the written articles but I couldn’t. Sorry, I know this might be too much of a question to be dealt in replies, but I just wanted let TWU know about my question since there’s no way to communicate to the university. Thanks again though for the great food for thoughts and please know that there are nerds who love everything the TWU does :^)
Watch it on 1.5x and it's fine.
part 2 must be using a lot of CGI in post production!
Who else is putting a calculator, protractor, ruler and chalk into their tennis bag now?
Great tutorial ... But I need an Indian teacher to teach the physics part of this video
It could be harder to understand then with the dialect of english.
@@pontusschroder8361 that would be true in most cases. But luckily for me, I have heard that dialect my whole life and am used to it.
Feels like I'm watching a VHS science video back in 8th Grade in 1985. Sorry Tennis Warehouse guys this is absolutely awful. Could be so much better these days.
I have no idea what I just heard. If you guys totally fabricated all of it, I would be forced to believe it. I’m now convinced I’m a certified idiot.
Lotta cringe in this video: 1) You can explain physics with math and still make it approachable. 2) Editing needs help