First three paragraphs have paramount importance. I cannot enough thank you for them.I'm dont think @Peter Masters likes to hear me say this but when I think of a sweet spot it is just that a spot on the racket.Think of of single string strung under tension between two points. The spot in the center is the easiest point to deflect a specific distance with a given force. If that string is deflected with the same force at any other point closer to the suspension points the string will not deflect as much. Dynamic Tension is a measure of the force required in Kg to deflect the Stringbed one cm. and a stringbed can be looked at just like that string except that the stringbed has two dimensions height and width and not just one like the single string has.
So now lets look at a string bed. The spot in the center of the frame is the spot on a string bed that is still going to be the easiest to deflect if all the string are tensioned at the same tension or if the string are strung proportional to their length. As you go out from that point in any direction DT will go up because that is the sweet SPOT. There is another point on the frame the Center Of Percussion (COP) which is found by the formula COP = M/SW*balance. The COP is usually just above the sweet spot where most people hit the ball but the DT at the COP will be higher than the DT at the sweet spot. Then there is the bottom of the racket. The lower I go down on the string bed to hit the ball the closer the impact point is to the COM. That why a racket will have more power in the lower portion of the string bed. The only reason you can apply as much force to the ball hiting in the lower portion of the string bed is because the contact point is not traveling as fast. That pretty much covers the centerline of the string bed but what happens when you hit off the centerline?
If you contact the ball off the center two mains the hit will feel harsher and harsher because the string bed is stiffer and you're farther away from the COM. IMO the only way to adjust your racket for that is to make the string bed softer or add weight specifically to increase Twist Weight. In the traditional way to string a racket you can lower the tension to increase the size of the sweet spot. I believe that is rubbish the size of the spot does not change and lowering the tension lowers the DT at the Sweet Spot the ball sits on the strings longer and you loose control. By stringing proportionally dropping the tension at you get farther and farther from the sweet spot you can equalize the DT across the string bed. It is always going to go up as you go out but the difference will not be as great. Assume you string a racket proportionally and in the center the four intersecting string (2 mains and 2 crosses) are strung at 60 lbs. it takes a given force to deflect the strings given distance. If you go to the up 4 stings and to the left 4 strings the same force will not deflect the strings as much. So what can be done to make that point closer to the sweet spot? Drop the tension of course. The DT will still be higher but it feels closer to the DT at the sweet spot. THe vibration will still be harsher because it is farther from the COP. You still have the fell of a bad shot but not as bad.
You can do what @Imago is doing and play around with you own proportional stringing method. He has strung a few racket with Gut/poly now and he says he has found the best frame he has ever played with. A few sets of gut/poly cost more than the Sergetti system and if you don't get lucky like @Imago and find just the right tensions you wasted a few sets of gut/poly.
Ha-ha, sorry for the misprint. "I'm dont think" when I'm write.Well TANK you too. LOL
This is perhaps what I’ve been most of 7 of 8 days in a row and my arm feels totally fine. Previously I would have felt my arm being a bit tight after each of these sessions. There are a few ladies around our club with those tennis elbow braces on. Not withstanding a lot are using a terrible racket for their injury and style of play, I wonder how much the a Sergetti stringing could positively contribute?Played again tonight, this time on clay. I don't understand it and can't believe it, but it does appear to make a difference. I had another really good outing. The string bed feels uniform and control is really good. Comfort is there as well.
I think you're wrongIf this is a thread dedicated to Sergetti stringing, please change correspondingly the topic because it became clear that Sergetti stringing is not proportional stringing. Some colleagues may be led astray to think that proportional is a synonym for Sergetti. So I am asking the OP or the moderators to change the topic to SO-STAB STRINGING or whatever @Peter Masters finds to be an appropriate and adaequate name for their stringing.
I don't get that sensation when I hit off center I do feel it.I cannot feel, where i hit the ball on the racket. On a normal string job you can feel it when you hit on the outside of the stringbed. Don't know if its good for training, when you don't know where you hit the ball on the stringbed.
Absolutely, I've not encountered any better. In the past all tension has been adjust solely on the length of the string. The Sergetti method using a lot more to determine the tensions that should be applied to the string but I'd still consider it proportional.So you think it's proportional stringing par excellence.
This would be an entirely new electronic head, much more sophisticated than Wise and almost impossible to program as you have to enter between 20 and 50 parameters and be always connected to an ever growing online database maintained by a community of stringers.OK. So what we need now is for an Electronic CP Tension Head manufacturer to implement a software app and hardware interface to allow the tension settings for each each string to be programmed prior to each string job.
I think "in general" a larger, uniform sweetspot must feel "better".I think any perceived difference is between the ears and folks subject to "tinkering" will think it's the cat's meow.
I would agree, I just don't happen to feel that this produces it.I think "in general" a larger, uniform sweetspot must feel "better".
I would think it would even be a "pity". When you say "measured by most" pray tell whatsoever do you mean?It's a pitty the difference with a "normal" strung racket can not be measured by most.
Both RT and the ERT "transform" a measured frequency into DT.I have both & find the ERT to be much more repeatable.
Yeah, whatever. I'll stick with the ERT.Both RT and the ERT "transform" a measured frequency into DT.
These are both indirect measurements.
A key-factor is the weight of the vibrating system. With RT this is only the stringbed, with the ERT this is stringbed + ERT.
As the weight of the ERT "dominates", the stringbed-weight-variations have hardly any influence.
No, I don't think measuring the DT accurately can be considered as "minutia". Every stringer with some self-respect measures the result of his string-job. And I do think that a lot of users of an ERT don't realize that this nice gadget measures by frequency-measurement. Why do you think a Babolat RDC uses a indentation method?Have you ever noticed that you consistently argue with each and everybody on the boards about nothing but minutia? If it was just me, ok, but everybody?
Indeed. And the best way to measure the result of any string-job is via direct feedback from the user (ie. the player who uses the racquet.) AFTER they have used the racquet. Any other measurement devices simply provides a "guesstimate".Every stringer with some self-respect measures the result of his string-job.
And he continues to argue....No, I don't think measuring the DT accurately can be considered as "minutia". Every stringer with some self-respect measures the result of his string-job. And I do think that a lot of users of an ERT don't realize that this nice gadget measures by frequency-measurement. Why do you think a Babolat RDC uses a indentation method?
Update: So I broke strings in one of the Sergetti strung frames and restrung it as mentioned above normal style. I have to say that while I was enthused to begin with, there really is no difference, certainly not a difference worth paying for. I did not find the Sergetti strung frame to display any extraordinary characteristics in comparison to the conventionally strung frame. IMO, the conventionally strung frame felt more solid off the ground.
It was worth trying, but in the end I cannot recommend shelling out $'s for this. I think any perceived difference is between the ears and folks subject to "tinkering" will think it's the cat's meow.
Its both: what you call the "guesstimates-value", in combination with user-experienceAnd the best way to measure the result of any string-job is via direct feedback from the user (ie. the player who uses the racquet.) AFTER they have used the racquet. Any other measurement devices simply provides a "guesstimate".
True the above. There have been quite a few guys who were first timers with me. They either tell me a tension or don't. If they do, I string it at that tension. If they don't, I'll ask them if they like tight or loose. In either case, the first time if they don't like it, I ask for feedback....tighter, looser? I make the adjustment and give them a free restring. Works wonders for them and is just fair play. 99.9% of them wouldn't know dynamic tension or string bed stiffness if it bit them on the arsecicle.Indeed. And the best way to measure the result of any string-job is via direct feedback from the user (ie. the player who uses the racquet.) AFTER they have used the racquet. Any other measurement devices simply provides a "guesstimate".
The same can be applied to any special stringing process. The ultimate measure of success lies in the hands (or is that mind?) of the user.
Ah! So if we can convince them all to walk East at the same moment, the Earth will proceed to rotate at a slower rate.Yeah , and when all people in NY walk west at the same moment, the earth starts to rotate faster.
After doing only the mains, the head is compressed ~2-3mm. A "average" string has a elastic elongation at 25kg of 2% that holds the tension, on 350mm = 7mm. So, every mm = ~3.6kg. 2-3mm compression --> 7.2-10.8kg tension-loss (which is recovered after finishing the crosses at proper tension).the multi strings go down by almost 10 lbs after stringing
Sorry to disapoint you, but even from the most expensive Babolat the towers will bend if you string the mains.Only if the holding posts and towers are released. Otherwise the frame is not being deformed. The only real deformation occurs when stringing the crosses.
I did use RT on my android. Installed it again ("it" did know I did pay last time, cause it was free now). Nice gadget.Hey, I bought racquettune and the other tool. I also have an ERT 300 have you used both?