# Thread: Does stiffness affect smash power a lot?

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If a stiff racquet was head heavy, does that change anything? Say if you had a medium speed swing, and you feel you're ok with a stiff racquet, would using a head heavy racquet change anything? say..the at700

2. SPOT ON Neil.

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Originally Posted by Neil Nicholls
If you have a slow swing, use a flexible racquet.
If you have a fast swing, use a stiff racquet.

the reasoning behind this is that energy is stored in the racquet when it bends, and released when it straightens. The time taken to bend and straighten is different for flexible and stiff racquets. Flexible = long time. Stiff = short time.

If you have a fast swing, the racquet does not have much time to bend and straighten, so you need a racquet that will bend and straighten very quickly, i.e. a stiff racquet.

If you have a slow swing, the racquet has more time to bend and straighten, so you need a racquet that will bend and straighten slower, i.e. a flexible racquet.

Fast swing with flexible racquet. You hit the shuttle before the racquet has time to release the stored energy, so power is wasted.

Slow swing with stiff racquet. The racquet bends and straightens before you hit the shuttle, so the energy stored in bending the racquet is not released into the shuttle. It may even start bending the other way, slowing the racquet head. Power is wasted.
Just to clarify:
Say I was a slow swing speed person. I read somewhere that "high repulsion on strings" is equivalent to "flexible shaft". Thus could I trade off flexibility with string type? This means I could use a stiff racquet but with more repulsive strings??

i.e. MP66 (flexible shaft) & BG65 (low repulsion) = MP99 (stiff shaft) & BG85 (high repulsion)???
Last edited by jcl49; 04-30-2005 at 02:17 PM.

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Could you even factor in tension of strings into flexibility of shaft and repulsion of strings?

Slow swinger <-----------------> Fast swinger
Flexible preference <-----------------> Stiff preference
Flexible shaft ------------------ Stiff shaft
High repulsion string ------------ Low repulsion string
Low tension string -------------- High tension string
Last edited by jcl49; 04-30-2005 at 02:19 PM.

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Originally Posted by Neil Nicholls
t

The best thing to do would be to try to borrow other peoples racquets to see if they make a difference. Try stiffer racquets and more flexible. I would say don't bother with the extra-stiff like MP100, MP99, AT800-OF.

Also try heavier and lighter racquets
I understand english quite well, but does 'don't bother' meen I shouldn't try these rackets?

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Originally Posted by Stijn
I understand english quite well, but does 'don't bother' meen I shouldn't try these rackets?
correct
That's only my humble advice though, and I think I should change it.
If someone will lend you a racquet to try, then try it.
Don't BUY an extra-stiff racquet without trying it beforehand.

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Originally Posted by Neil Nicholls
correct
That's only my humble advice though, and I think I should change it.
If someone will lend you a racquet to try, then try it.
Don't BUY an extra-stiff racquet without trying it beforehand.
and dont buy a very head heavy/head light racquet without trying either, unless u've played with similar ones before....

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Originally Posted by Neil Nicholls
correct
That's only my humble advice though, and I think I should change it.
If someone will lend you a racquet to try, then try it.
Don't BUY an extra-stiff racquet without trying it beforehand.
ofcourse not, I go espacially to germany (I live in belgium), because there's a nice place where you can test rackets before you buy

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## at 700 + low repulsion string

Originally Posted by jcl49
Could you even factor in tension of strings into flexibility of shaft and repulsion of strings?

Slow swinger <-----------------> Fast swinger
Flexible preference <-----------------> Stiff preference
Flexible shaft ------------------ Stiff shaft
High repulsion string ------------ Low repulsion string
Low tension string -------------- High tension string
I use at 700 with a string with low repulsion (rally 21, ashaway), 10,5 kg.
I wanted to try this string. I tried bg-80 before, 12 kg (the tension was too high for me).
I feel not so comfortable with the ashaway string. Could it be just too much to use a racket with a quite stiff shaft and low repulsion string? And does head-heaviness is important too (because a head heavy racket "feels" heavier than a head light racket (higher swing-weight...)?
The string felt quite dead in my opinion even when it was freshly strung.

I mean i play for 5 years but i think i`m beginner level. Perhaps my stroke is not fast enough for this "mix"?! I always felt comfortable with bg-65, but i never tried it with at-700. Does bg-65 produce higher repulsion?
I hope this isn`t off topic...

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Originally Posted by TrueBlue
I mean i play for 5 years but i think i`m beginner level. Perhaps my stroke is not fast enough for this "mix"?! I always felt comfortable with bg-65, but i never tried it with at-700. Does bg-65 produce higher repulsion?
I hope this isn`t off topic...
BG-65 is extremely durable, but repulsion of this string isn't very great..

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Neil - is the the only way I can check whether my racket have the proper stifness/flexible, to try different rackets? -isn't there some kind of test I could do?

Originally Posted by jcl49
Could you even factor in tension of strings into flexibility of shaft and repulsion of strings?

Slow swinger <-----------------> Fast swinger
Flexible preference <-----------------> Stiff preference
Flexible shaft ------------------ Stiff shaft
High repulsion string ------------ Low repulsion string
Low tension string -------------- High tension string
What is the exact relation between stiffness/flexible and repulsion/tension??? low tension should give more power right and higher tension less power but more control? Stifness/flexible is correlated to speed of swing, but is it proved that e.g. a fast swing and stiff racket will be "destroyed" by a low tension?

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Originally Posted by Mikael
Neil - is the the only way I can check whether my racket have the proper stifness/flexible, to try different rackets? -isn't there some kind of test I could do?

What is the exact relation between stiffness/flexible and repulsion/tension??? low tension should give more power right and higher tension less power but more control? Stifness/flexible is correlated to speed of swing, but is it proved that e.g. a fast swing and stiff racket will be "destroyed" by a low tension?
I don't think they will reply to you because this thread is 3 years old.

To answer your question the racket stiffness and string are completely different things so there is no relationship between them. If you are able to bend a stiff shaft you will get more power than the flexible. This also applies to string, if you can flex the string at a higher tension you will get more power than a lower tension.

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Thanks Phandrew, I forgot to pay attention to the date.

I use an old racket where it says "flexible", and I think it is time to look for a new racket, but I mean I cannot effort to buy five different rackets just to try them out. So therefore I hoped that there existed a test you could do...

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Originally Posted by Mikael
Thanks Phandrew, I forgot to pay attention to the date.

I use an old racket where it says "flexible", and I think it is time to look for a new racket, but I mean I cannot effort to buy five different rackets just to try them out. So therefore I hoped that there existed a test you could do...
There are some brands that test stiffness based on putting a weight on the shaft and seeing how many degrees it bends. The smaller the number the stiffer the racket it is.

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Ok, I can not find such a number.
Even if there was such a number, I still need to know how to measure my armswing speed (maybe by video!?), and then how to link it to these numbers!!!

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Originally Posted by Mikael
Ok, I can not find such a number.
Even if there was such a number, I still need to know how to measure my armswing speed (maybe by video!?), and then how to link it to these numbers!!!
I think practicing and coaching will help you the most with swinging faster.

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Originally Posted by Mikael
Ok, I can not find such a number.
Even if there was such a number, I still need to know how to measure my armswing speed (maybe by video!?), and then how to link it to these numbers!!!
Black Knight racquets have a rigidity index where it goes from something like RF-80 (least stiff) to RF-90 (most stiff). I'm not sure if you can find BK racquets in Denmark though and I haven't seen similar scales with other brands.

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