Category Archives: News!
Thank you for listening to the Racquet Quest Podcast!
I am posting here to make an addition and a correction to a previous podcast, and this is quicker than waiting for a week or so for a new episode.
The “Stringing and Racquet Data” podcast was cut short, so I will finish it here.
We were talking about the three (3) scale system we use to determine the torsional balance. The racquet is weighed at the midpoint of the head at the “top” and “down,” and the butt cap is resting on the third scale, and that is called the “butt.”
I don’t recall the podcast numbers right off, so I will use numbers from another racquet to explain. The racquet is a Wilson Ultra 100. The “top” weight is 95.3 grams, the “down” weight is 96.0 grams, and the “butt” is 119.9 grams for a total of 311.2 grams (10.97 oz.). So you can see the difference between the “top” and “down” number is only .7 grams, which is about a quarter of the weight of a vibration damper!
However, if this number was over 5 grams, we may want to “match” the numbers a little more closely! But, what if we wanted to increase the “top” weight by a lot to have the head heavier on one side than the other side? Why? Maybe a “training” aid to remind the player to keep the head lower, for example. Our experience shows that a difference between the “top” and “down” of 6 grams is noticeable.
On the Yonex VCore Pro 97 – Racquet Review, I noticed after the fact that I had indicated the Ereca System calculated the balance (CG) to within one-tenth of a centimeter! That would be pretty good, but in fact, the Ereca System calculates to within a tenth of a millimeter! Very precise! As of now, the Ereca System does not calculate swing weight as I tried to correct on the podcast but wanted to confirm that point.
Thank you for visiting the Racquet Quest website and listening to the Racquet Quest Podcast! Please let me know if you have any questions and suggestions for exciting topics!
The World Headquarters of Racquet Quest was closed for a brief road trip the week before last and we are just now beginning to catch up!
But it was worth it!
The trip took us to Atlanta to visit family, Louisville to visit friends, Columbus, IN to visit family and Asheville, NC just because!
While in Columbus I had the opportunity to play a little tennis with our 2 year old great-grandaughter! Emma is not quite calling it tennis yet but that will come soon enough! Not once did she complain of loose strings or the wrong grip size, either!
Emma sure knows how to pick an outfit! She is well on the way to becoming a real tennis player! What more could you want…Head tennis racquet, adidas Stan Smith shoes, cool tennis dress…Wow!
We have what seems to be a zillion demo racquets, and there is a player for each of them, I suppose.
One of the biggest complaints against “demoing” is precisely that…too many to choose from!
This is what we recommend;
- Start the convesation with yourself before you need to make a decision. Allow a month before the “season” starts if you can,and start the conversation with us early on.
- What do you want that your current racquet is not providing.
- What is your budget. If you are a junior what is your “sponsors” budget.
- With these three questions you are well on the way to a painless “demoing” expreience!
Here is what we would like to have to speed up the process:
- Bring your current racquet in “play ready condition” with you to the primary discussion.
- Tell us what has changed physically since you selected the current racquet.
- Injuries, including tennis elbow, shoulder and wrist issues, or a long layoff, etc.
- What do you want the new racquet to do that the current racquet is not?
- Power, or “POP”, Control, Comfort, Grip Size, String Issues, etc.
- Do you have a brand preference?
- If we can make your current racquet better will you not demo other racquets?
- It is possible that the current racquet can be better than it is so demo it as well after some customization.
- Tell us if this is of interest or “I want a new racquet…period!
With this information we can make the demoing process much more fun,consise, and ultimatley rewarding, and in a much shorter time period.
Our demo process is free however we believe the racquet should be “setup” just as it will be used which may require stringing and a litttle customization and there will be a charge for that if you agree.
Our huge database of racquet specifications allow a quick look at the characteristics you prefer.
We think you wil be surprised at how much fun the demo process can be!
The Gravity Pro is the racquet all 18×20 players have been waiting for!
Why? Great weight, and excellent swing weight right out of the box! For players that think the Prestige models are too stiff, (they are not), this model will provide feed-back that the Prestige damps out through the cap system.
Big hitters will benefit from the 18 x 20 string pattern when going for the “flat, down the line” shot.
You will see all the specifications later on but now let’s talk about the reaction to the binary graphics package that is used on all the Gravity models. One side is Lava, and the other side is Miami Green ( my description) which makes for an exciting pickup reaction!
The excellent stiffness of RDC 60 combines with the dense string pattern to yield an effective stiffness of 30.7.
Now for some fun!
|Racquet Model||Head Graphene 360 + Gravity Pro|
|Reference Tension||57 lbs - 25.9 kg|
|String||Head Velocity MLT 17 Black|
|Machine Used||True Tension Professional|
|Racquet Flex, RDC||60 - After stringing|
|Racquet Flex, FlexFour||46|
|Racquet - In Plane Stiffness||428.6 lbs/Inch|
|Head Area, cm2||645.2|
|Head Area, Sq. Inch||100.0|
|Number of Main Strings||18|
|Number of Cross Strings||20|
|Main String Grid||7.75|
|Cross String Grid||10.25|
|Density (% of head filled with string)||.794|
|Average Cross String Space||.513|
|Average Main String Space||.431|
|Dynamic Tension, Kp, ERT||40|
|Dynamic Tension, Lbs/in||233.7|
|First Moment, Nm||.824|
|Swing Weight, Kg/cm2||331|
|Swing Weight, Ounces||11.68|
|Swing Weight Calculated||348.6|
|Head Weight, %||47.5|
|Center of Percussion||21.5|
|Dwell Time, ms||8.02|
|Efective Stiffness - lbs||30.7|
If you read “Play Like a Girl,” you will have a good idea where this is headed! This part is intended to make it possible for you to experiment without feeling “forced” so it is based on “numbers” not “feelings.” Of course, feel is relevant to tennis players.
Two events this week make it easy to compare numbers and feeling.
- A racquet came in from a tournament playing junior that had the good fortune of picking up a competitors racquet and recognize the difference immediately and wanted to try it. His racquet is a Babolat Pure Strike 16×19 with a swing weight of 302! The racquet he picked up has a swing weight of 341! His revised swing weight is 325.
- A really good young lady is switching racquets and string setup, so there is a four (4) inch strip of 1/4″ tape on the inside of each side of the string bed in the 3 and nine o’clock position — total weight of about 5 grams, for a swing weight of 321. During a training session, a coach said the racquet was too heavy and removed about 2 inches total of tape, maybe 1.5 grams, and everything was fine! This player is strong enough to play with a 335 swing weight so was this a “visual” suggestion, and the process of removing tape convinced the payer that the racquet was now much lighter?
In case you don’t remember there are 28.35 grams per ounce. So you can see that 1.5 grams is quite small!
Did you know that a dry overgrip is about 5 grams and a wet over grip can be as much as 12 grams? The location of an overgrip (under your hand) has virtually no effect on swing weight so it generally goes unnoticed.
Unless agreed upon in advance most weight can be removed or re-located so don’t fear your friend…weight!