RacquetTune Question

LOBALOT

Hall of Fame
I was thinking about RacquetTune the other day and how they have the user enter the number of mains/crosses and the area of the racquet face and I am wondering if other than for racquet stiffness calculations these parameters do not come into play when it records tension. I am wondering if the proper string factor is not only critical but the only factor it uses when it calculates the tension from the tone it records. Thus, the string factor better be right on.

Am I correct in that?

My reasoning is that if I had an odd ball proportional stringing where say the middle 4 mains and crosses are at 50 pounds and the rest of the racquet is strung at 10 pounds and if I hit/pluck the center 4 mains/crosses it will give 50 pounds.

In addition, like a guitar if I held down a string with 3 fingers on 3 different frets the note is created by the length of string from the lowest finger down to the end of the string. The fingers/frets further up the neck do not come into play in producing the tone. Similarly, the number of mains and crosses should not mater nor the area of the racquet face.

The reason I am asking is I have been receiving some requests for string I have not previously worked with and lately I am getting some odd readings when I download string factors for these strings so am wondering if they are bad values. In most cases the string factors I have been using for some time are fine.

Thanks!
 

esgee48

G.O.A.T.
String lengths and size come into play somewhere. If I do 16x19 100 in² vs 110 in² with same string and ref tension, RT gets the tension 'right' though the tones are certainly different. I suspect that the developer is averaging the lengths base on size and # strings. I have found that DL string factors are sometimes suspect. The ones that I trust are the ones I measured myself since I use the same strings in most of the frames within a narrow frame of ref ranges. Number of observations = 1, so your experience may vary.
 

LOBALOT

Hall of Fame
Thanks, I guess I will need to start measuring my own. I recall a past thread on measuring the factors form a year or two ago so will dig it up. I think you actually responded on how you measured them if I recall correctly... Thanks again!
 

Irvin

Talk Tennis Guru
I never change anything. I use the same pattern and string factor for everything. You’re not going to get an exact tension so what difference does it make? More often than not I just compare frequency anyway.
 

LOBALOT

Hall of Fame
I never change anything. I use the same pattern and string factor for everything. You’re not going to get an exact tension so what difference does it make? More often than not I just compare frequency anyway.
How do you compare frequency?
 

Irvin

Talk Tennis Guru
How do you compare frequency?
Same frequency in like rackets same tension. The higher the frequency the higher the tension. When frequency drop off tension drops. If you have a racket and fresh off the machine frequency it is 600 cps you know what you have. Some people ask for a tension let’s say 55 #. Not a real good method of checking that tension IMO. But you can check frequency.

EDIT: If you were asking the procedure for checking frequency. From the menu select tension then for unit select Hz which is for Hertz or CPS (cycles per second.)
 
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hypervox

Rookie
Anyone tried the tennistension app? I downloaded racquet tune but just can't get it to work on android

Sent from my SM-A505F using Tapatalk
 

Brand77

Rookie
I am also on Android and bought the tennistension app which I find slightly more convenient than RT. I don't use the settings for Tightness and string opening size though. I don't feel like using calipers each time I measured a racket :) And it doesn't make sense to me to compensate for a stringers "tightness".

The calibration option seems to be a nice feature, but I'll need to get more consistent in my own stringing first.

At the moment I am still using both for comparison, but I have a feeling that I'll uninstall RT soon.
 

tennisbike

Professional
It boils down to this, the reading from RT or frequency, is best used to compare to the exact same racket and string to be meaningful. You can see how the string bed changes over time, in a macro way.

All the multiple parameters used in RT or similar apps, tries to make it so that you can compare across different size stringbed, string type, string thickness.... If you trust the fudge factor, that is the algorithm, then use it. Don't think too much about it.

By the way, RT won't tell you that as the racket is used the characteristic of the string bed does not degrade uniformly. From what I measured, the center tend to develop a softer spot/hot spot. People typically called this trampoline effect.
 

LOBALOT

Hall of Fame
I use RT just as a quality control check on my stringing especially when I string someone else's racquet. If I am stringing someones racquet at 50 Lbs and I am consistently getting 51 LBs on RT each time I string it with the same string then I know I am good. If I get 54 or 47... Not so good!

Note: I check my Ghost 2 periodically at different tensions and I know it is pretty close to spot on.
 

Irvin

Talk Tennis Guru
Hi Irvin, do you have a scale with frequency and corresponding string tension? (eg 440Hz = A above middle C in the musical scale)
No you can’t do that. The same frequency in different gauges, head size, pattern, or type of string would be / may be different tensions.

EDIT: You could just change units from Hz to lb or Kg to get tension.
 
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