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  1. thomas.pong is offline
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    #21
    Quote Originally Posted by Dipak1974
    How does it compare to Rozena? My lad is using Rozena both sides and does get on really well with them but I’m curious how Rakza 7 compares to Rozena.
    To me, Rakza 7 offers more speed and spin than Rozena, which is softer, a bit bouncy, but more controllable and predictable.

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    #22
    Quote Originally Posted by Dan
    Hey everyone!

    We have released a lot of equipment reviews over the years but one that pops up often in the comments and requests is Yasaka Rakza 7. So here it is, our most requested table tennis review ever!

    Glad you guys finally reviewed Rakza 7! One of my favorite rubbers of all-time.

    Great balance of speed, spin and control as well as price-performance ratio.

    I do think that it is spinnier and grippier than you give it credit for, more like an 8, when MX-P should be rated the same as T05 at 9.

    The only down point I have with R7 is its weight which is 50+g cut.

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    #23
    Really good rubber. Nothing special if you play 20 hours every week but if you play one day a week-best choice 2,0 spongefor amateurs.
    slipping is bad side

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    #24
    brokenball;334476Rubbers don't have control. The player does.
    People are not calibrated machines. The way to review a rubber is like how Pathfinderpro did years ago.

    I wonder how Dan measures grip. I think he means coefficient of friction.
    I would like to see them Dan and Tom a match. One with Rakza 7 and the other with their favorite super rubber. Then switch. The reason why is that each rally starts out relatively slow. For the most part they are just blasting balls back and forth. What would each player think they were giving up and would their perceived increase in control make up for it.

    I don't like the comment about lifting backspin. Lifting back spin can be done with any normal rubber and SP.
    The key is the match the tangential ( rotational surface ) speed of the ball. The ball will go back with the same amount of spin if you do this. If you swing faster you can close the paddle a little and increase the spin but you must swing faster than the surface speed of the ball to do this.

    What it all comes down to is normal and tangential coefficient of restitution and whether you like the feel of the rubber. The relative coefficients of restitution could be measured. A TT ball can be shot at the rubber to measure the rebound. How far it bounces is an indication of the normal coefficient of restitution. If the ball has spin then the angle of the bounce off the paddle is an indication of the tangential coefficient of restitution.

    I don't like reviews. There is too much opinion in all those except where there are measurements done like in Pathfinderpro's videos but that requires a lot of work.
    What is also missing from these reviews is that can I do with this rubber that I can't with the other rubber.

    Where I agree with Dan is the price/performance ratio. I buy my Rakza 7 from Tabletennis11 where I get 4 for the price of 3.

    As a scientist, I would also prefer to measure/quantify characteristics of rubbers and blades. There are clearly some ways that could be done, BUT it would require expensive technical equipment plus a lot of time spent.

    In the end, who will pay for that? As it is, none of us who review equipment are getting rich of it, especially considering the amount of time that goes into writing and/or making video reviews. Experienced players/reviewers CAN qualitatively describe how the equipment feels to them and communicate the experimental observations (e.g., length of trajectory, amount of spin based on how opponent reacts, soft/sharp feeling, etc). Is this approach scientific? No. Is it biased? I am sure we all try to be as objective as possible. Is it helpful? I think it is.

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    #25
    Hi everyone, I have a question about how-to pair this rubber.

    Previously I have used Rakza 7 on a 5 ply limbe topped blade, and it was very good. It encouraged me to complete my stroke and encouraged me to hit hard with it.

    However I tried to put this on Carbonado 45, and I just couldnt feelt he grip anymore. It felt like it just penerated the rubber/sponge, rebounced by the blade, and then shot out without gripping and spinning the ball. Is it because carbonado 45 is relatively stiff and hard compare to a 5 ply limba topped blade? Or is it the rubber is relatively soft and it just doesnt work as well on a carbon blade?

    Is it also related to the notion (in Dan's review) that there isn't as much grip and/or "purchase" on this rubber
    Last edited by virtuososiu; 03-04-2021 at 10:46 AM.

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    #26
    Quote Originally Posted by yogi_bear
    Rakza 7 is really good and like the Vega Series rubbers, it is still a good rubber for polyballs but with lesser spin due to ball change.

    Hi Yogi bear, just wondering if you can share how-to pair Rakza 7.

    I really liked it on 5 ply wood blade, but not so much on the carbonado 45.


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    #27
    Quote Originally Posted by virtuososiu

    Hi Yogi bear, just wondering if you can share how-to pair Rakza 7.

    I really liked it on 5 ply wood blade, but not so much on the carbonado 45.

    MA Lin Soft Carbon, Falck W7, Ma Lin Extra Offensive

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    #28
    Quote Originally Posted by The Pong Professor

    As a scientist, I would also prefer to measure/quantify characteristics of rubbers and blades. There are clearly some ways that could be done, BUT it would require expensive technical equipment plus a lot of time spent.


    Once a standardize testing setup is made it wouldn't take too much time to test a rubber. The main things to test are the normal and tangential COR. That wouldn't take long.

    [quoute]
    In the end, who will pay for that? As it is, none of us who review equipment are getting rich of it, especially considering the amount of time that goes into writing and/or making video reviews. Experienced players/reviewers CAN qualitatively describe how the equipment feels to them and communicate the experimental observations (e.g., length of trajectory, amount of spin based on how opponent reacts, soft/sharp feeling, etc). Is this approach scientific? No.
    [/quote]
    That is the problem. People aren't calibrated. I am an expert at motion control. Over 35+ years I know that people think they see things that really are wrong. It takes a high speed camera and other data acquisition devices to know what is really happening.
    I don't trust people's opinions. I trust measured facts.

    I have the equipment to test TT blades, rubbers and balls.

    Is it biased? I am sure we all try to be as objective as possible. Is it helpful? I think it is.

    I don't do product reviews because I am not a calibrated machine.
    I do have opinions. I know what I like and what works for me.
    Again, I don't trust people's opinions. I only trust what I can measure.

    I regard all the TT manufacturers as fraudulent scam artists and too many people are suckers. I know at times I have fallen into that category. Too many believe the equipment will help them. It won't. Practice, technique and ability are the key.

    I am 67 now and play for the exercise. There has been no league play for a year now. I find Rakza 7 to be a good compromise between cost and any supposed magic.

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    #29
    Quote Originally Posted by The Pong Professor

    As a scientist, I would also prefer to measure/quantify characteristics of rubbers and blades. There are clearly some ways that could be done, BUT it would require expensive technical equipment plus a lot of time spent.

    In the end, who will pay for that? As it is, none of us who review equipment are getting rich of it, especially considering the amount of time that goes into writing and/or making video reviews. Experienced players/reviewers CAN qualitatively describe how the equipment feels to them and communicate the experimental observations (e.g., length of trajectory, amount of spin based on how opponent reacts, soft/sharp feeling, etc). Is this approach scientific? No. Is it biased? I am sure we all try to be as objective as possible. Is it helpful? I think it is.

    I think you would agree with me that being too technical will not enable normal readers to relate to a post.

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  10. thomas.pong is offline
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    #30
    Quote Originally Posted by brokenball
    Once a standardize testing setup is made it wouldn't take too much time to test a rubber. The main things to test are the normal and tangential COR. That wouldn't take long.

    [quoute]
    In the end, who will pay for that? As it is, none of us who review equipment are getting rich of it, especially considering the amount of time that goes into writing and/or making video reviews. Experienced players/reviewers CAN qualitatively describe how the equipment feels to them and communicate the experimental observations (e.g., length of trajectory, amount of spin based on how opponent reacts, soft/sharp feeling, etc). Is this approach scientific? No.
    Since you have the know-how, the testing equipment and it wouldn't take long, it would be great and very valuable if you would test rubbers and blades scientifically and publish your findings!

    Similar to what TTGear Lab does with his graphs but more in-depth.
    Last edited by thomas.pong; 03-05-2021 at 08:55 AM.

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    #31
    Quote Originally Posted by virtuososiu
    Hi everyone, I have a question about how-to pair this rubber.

    Previously I have used Rakza 7 on a 5 ply limbe topped blade, and it was very good. It encouraged me to complete my stroke and encouraged me to hit hard with it.

    However I tried to put this on Carbonado 45, and I just couldnt feelt he grip anymore. It felt like it just penerated the rubber/sponge, rebounced by the blade, and then shot out without gripping and spinning the ball. Is it because carbonado 45 is relatively stiff and hard compare to a 5 ply limba topped blade? Or is it the rubber is relatively soft and it just doesnt work as well on a carbon blade?

    Is it also related to the notion (in Dan's review) that there isn't as much grip and/or "purchase" on this rubber
    I've used Rakza 7 on several blades, Viscaria, Innerforce AL, Korbel, Virtuoso, Harimoto ALC, Primorac OFF-, Hadraw VK, Acoustic, and it felt great on both FH and BH on all of them.

    I haven't tried the Carbonado 45, but I know it's a particular blade in that it's a low/soft carbon-type, which can be a bit muted, so maybe that has something to do with it. But it could likely be more based on the bellow:

    Based on your impressions, it seems like to you, Rakza 7 feels relatively soft, whereas I find it relatively hard (both are legit). In the same fashion, it seems like you find Carbonado 45 to be stiff, whereas I would probably find it to be soft and flexible. Personally, I prefer a hard rubber on a soft and flexible blade, so I likely wouldn't want a rubber I perceived to be soft on a blade I perceived to be stiff. I know for others, it's the other way around.

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