Babolat RPM Series string
On top of giving a new graphic identity to their string packages, Babolat has decided to redesign the structure of their string ranges and add new references and modify the name of certain models.
We have decided to focus on the RPM range : this range consists of monofilaments and is oriented towards spin and control
(RPM = Rotations Per Minute).
The RPM range is composed of the following strings :
in the range
RPM Blast Rough
and same name
RPM Blast Team
Pro Hurricane Tour
In order to compare the different strings, we have tested them according to to following caracteristics :
The test protocol : In order to obtain objective comparisons, we used the Playsight system on our tennis court. This is a machine that is connected to 5 cameras around the court to analyse each shot and provide accurate statistics on : speed • rotation • height over the net • accuracy We were able to rank the strings based on each aspect listed above. We even used a ball machine in order to guarantee that a similar type of ball was coming our way during the various tests.
In order compare the ball speed, each tester had to hit 10 shots as hard as they could on the forehand side, then on the backhand side with each Babolat RPM string range.
The more flexible the string, the more it deforms and this accumulates energy during the time of contact with the ball. Similar to a trampoline with stiffer springs. The stiffer springs will not allow you to jump as high as a trampoline with looser springs. A monofilament is stiffer and thus generates less energy. This will limit a monofilament string's ability to develop ball speed.
In order to compare each strings' competence in terms of control, our two testers did an exercise where they had to hit a precise area of the court.
The stiffer the string, the more it will enhance your control. The low return of energy will enable you to master your shot placement. Monofilaments, as indicated in the name, are made with only one filament. This filament is usually made of very stiff polyester. This will limit string movement and put forth more control compared to a multifilament.
In order to compare the five strings' ability to generate spin, our two testers hit short and cross-court shots. This maximised their likelihood of hitting with more ball rotation.
Spin can be measured by the number of rotations applied to the ball per minute.
Several factors can influence your ability to hit spin :
• A textured string : certain strings possess a rougher finish in order to grip the ball.
• The « Snapback » effect : This consists of string movement and more particularly, the mains will quickly come back into their original place and increase ball rotation.
A string naturally loses tension over time. This is why it is important for a string to maintain its initial tension for a longer period of time. This will allow you to benefit from better feel when you are striking the ball.
In order to measure each string's ability to maintain its initial tension, we have measured the tension right after stringing the racquets.
We then put the racquets aside for one hour before conducting the test and we measured their tension once again.
Tension loss can derive from several factors :
• Time duration because even in optimal conditions, a string's tension will progressively loosen.
• The humidity, especially with natural guts.
• The temperature : whether it is too warm or too cold, a string can loosen.
The comfort level of each string has been noted by the testers at the end of each test.
A string's comfort level is directly related to the materials used to make the string :
• Multifilament strings also offer an exceptional amount of comfort.
• Monofilaments provide the least amount of comfort because they are stiffer.
Following our tests and analyses, we can provide you with a recap chart below
in order to help you find the string that best corresponds to you and the advantages you are looking for.