Category Archives: True Tension
Jumping back and forth between reviews and data is not fun nor is it efficient so we have been posting comparative data. Now all the important stuff is in one place.
All of the data is based on a “play ready” racquet. That means an overgrip and vibration damper, and unless otherwise noted…string!
As you are looking at the data try to determine which numbers mean the most to you and how you could use them. For example, the Pro has an overall weight of 342 with a swing weight 318. How does that compare to the MP?
Keep in mind that weight and swing weight can increased but not easily decreased. No, making the racquet more “head light” statically does not reduce the swing weight as recorded on testing devices that grab the racquet 10cm from the end! That is why static balance (CG) should not be used as a performance metric.
Click here to see the data!
I am not saying the is not a serious tennis racquet but the first descriptor that come to mind is “fun”! And who does not want to have a little fun while playing tennis, huh?
This is one of the remaining racquets with the “O” Port technology which is very large string openings instead of small grommet holes. The design allows for much more string movement and the 16×18 string bed helps! The “O” Ports create an effective head size of 105 in a racquet that measures 100 square inches.
But, just look at those colors! I think they are awesome!
This is a constant taper beam starting at 22.5mm going up to 27mm so if you are “thin beam” person you may hesitate to hit with this racquet, but we think you may be missing out!
If you just look at the racquet you may think it to be quite stiff. That is not the case! With an RDC stiffness of 62 after stringing we arrive at an effective stiffness of 30.2 with this string setup. Not bad!
Take a look at the specs then come get the demo and see what all these numbers mean to you!
|Racquet Model||Prince RipStick 300|
|Reference Tension||60 lbs - 27.2kg|
|String||Prince Premier 16|
|Machine Used||True Tension Professional|
|Racquet Flex, RDC||62 - After stringing|
|Racquet Flex, FlexFour||46.6|
|Racquet - In Plane Stiffness||504.2 lbs/Inch|
|Head Area, cm2||645|
|Head Area, Sq. Inch||100.1|
|Number of Main Strings||16|
|Number of Cross Strings||18|
|Main String Grid||7.56|
|Cross String Grid||9.12
|Density (% of head filled with string)||.679|
|Average Cross String Space||.531|
|Average Main String Space||.469|
|Dynamic Tension, Kp, ERT||36|
|Dynamic Tension, Lbs/in||201.35|
|First Moment, Nm||.814|
|Swing Weight, Kg/cm2||320|
|Swing Weight, Ounces||11.29
|Swing Weight Calculated||342.2|
|Head Weight, %||47.2|
|Center of Percussion||21.2|
|Dwell Time, ms||8.28|
|Efective Stiffness - lbs||30.2|
We all have heard the question “which comes first the chicken or the egg”? However, my question is “Which comes first the game or the string”?
I believe they happen simultaneously. But first a quick story.
In 2005 I was attending a Head product introduction on the island of Mallorca, Spain, Yes, that one!
The product introduction was exciting but what I am going to tell you about now was even more meaningful.
The Director of one of the top US Tennis Training organizations, at that time, was there and we were discussing teaching techniques and what he said after being in this part of Europe was “we need to start teaching our players how to hit this way!” Well, “this way” was the way of low-powered strings that were popular in Europe but not so much in the US, yet.
So, it began! The players could not hit harder, like the Europeans, unless they used the same string material as the Europeans and that was very stiff and mostly PET polyester.
So, the idea was the “egg” and the string was the “chicken”, sort of! I guess the feeling was that “if Americans are going to compete we must use the same equipment”.
Now, I believe the professional game can go on about its way but otherwise, we need to consider changing the game by returning to a combination of comfort and playability.
Our history shows us that the “high performance” life span of many polyester strings is about 2-3 hours, or less, maybe about 10-12 games. We don’t believe this is quite long enough for most players. But, how do you quantify “performance”? It may be different things for different players.
There are many components to performance but what if it was associated with UTR data? Racquet Quest can track UTR numbers and make some determinations based on that data. If a UTR is stable or increasing it is a good bet that the performance of the player and equipment is OK. However, if the UTR is slipping it is a good indication that something is not working as it should…but what?
We have found that, in some cases, it is injury or discomfort, that is causing the slippage! Stop it! The following data is for a 12 month period and acquired from the UTR website. Even small positive changes are tough! But negative changes seem to have an enormous impact more quickly than positive changes!
|A||Head Speed||PEEK||12.84||12.86||+ .02|
|B||Babolat Pure Aero||Polyester||10.91||9.56||-1.35|
|C||Head Radical MPA||PEEK||4.50||5.61||+1.11|
|D||Wilson Pro Staff 97||PEEK||5.0||7.03||+2.03|
|E||Babolat Pure Aero||PEEK||3.8||5.64||+1.84|
|F||Wilson Blade 98||Polyester||10.0||9.41||-.59|
|G||Head Radical Pro||Natural Gut||3.7||5.15||+1.45|
We all know what friction is. It keeps our cars from sliding around, it keeps us from slipping and in general makes movement possible!
Friction also plays an important part in the string bed of your tennis racquet. Friction between the strings and the ball create friction which in turn creates rotation.
What are, however, some of the downsides of friction in the string bed during, and after, the stringing process?
For more detailed information and a graph showing the forces involved go to our membership site, GASP.network, but in the meantime this image will show the frictional forces at work!
This machine tension head will pull the string (blue) in the direction of the center of the racquet support structure instead of directly out the middle of the grommet.
It is obvious that this will create considerable friction and result in lower tension inside the grommet than outside the grommet.