Tigerarp1
Rookie
JohnCauthen: I was serious about wanting to get in contact with you about your ideas. I would like to put them to use on my racquets. Please email me at Tigerarp11@yahoo.com
Thanks!
Thanks!
MT120 said:johncauthen maybe you should stop trying the onsize fits all approch and go with an assortment of size and a esay to read sclae so people can find which one they need to buy. that should be very practicle since you have so many "arrowhead weights" that work well on some rackets and not others. It could be like picking specfic strings or shoes (only not a many to choose from) and let the people using them decide what feels right instead of you killing yourself over it.
Bill Tilden said:Jhon, this is my experience i hope it can help you. I have a little hand an last year i loose with player with a big structure and big hand.
I man with a big hand when take up a racket rebalanced the racket with weigth in the handle that is his own hand, so a person like me that have a little hand need moore weight in the handle, I put on 100/110 grams and i have all my raquet at 16.2 oz.
Now i can compete with players with big physicist and skeleton, last year when i give them my hand at the end of the mach I always thougt: "what big hand".
Now i have understand. I have a photo of Rod Laver, the only players that have won two grand slam, where he pick up the cup of Wimbledon with only one hand like a glass.
So i think you need to make a weight that every one can modify in relation of his own characteristics. Where peaple can add or take off weight. Rod problably don't need weight he has weight in his hand
bluegrasser said:You know John is right, about Fed using different racquets that is, but I thought is was the picture making the beam look different in past shots. Good observation my man.
Overall, the racquet was very efficient. It is like a super tweener. Good to use against the Pure Drive players (the ones who get their power from the midplus head + the PD's incredible power). I like the power. My only problem is that I cannot serve very well with it. For some reason, the "pop" is just not there. I'm spending the day tomorrow serving with it, so I'll let you know how things turn out.TennisAsAlways said:04-19-2006, 07:17 PM
John, after I adjusted your tapered weight on the 6.3 (lowering it a bit), I got the frame to play a lot better.
The groundstrokes were amazing. The dynamics were very efficient. It was almost alive. To exaggerate the effect that I am talking about, just hold the frame "loosely" and sway it in the air, during a "windy" day. It doesn't need to be extremely windy, just a gust. The frame almost floats in your hand. That's what I mean by describing it as "alive". Of course you can still feel this phenomenon inside your house, with no wind; it's just more pronounced in the wind, since the wind is a "force" that gets the frame moving.
The reason why the frame behaves that way is due to it's "quick action". The added mass at the precise location makes the frame move as if it were a very short "sling", and that leads to "quick acceleration". So it (the racquet head) essentially responds instantly when you force it to, rotating around.
This is why the frame feels lighter. Going by the law of physics, moving mass feels lighter. Since the frame reacts quickly and even the slightest force gets it started (moving), that is why it is so easy to move the frame around. You don't need to exert a lot of energy to get the mass moving. Just one slight subtle movement gets it going, therefore you can control and direct the frame, rather.
I've been having a lot of fun with this frame. My groundstrokes have been very consistent with that modded 6.3. The only thing that I am still trying to get used to is serving with that frame. It just feels so different. For serves, when I swing at ball, I can feel the momentum going up into the ball, but it feels awkward. The groundstrokes, on the other hand, are just beautiful, but the serves feel weird. It's almost as if you have to learn how to serve differently with this frame. I don't know.
Also, John, I don't know how you could market this weight concept. You see, it took me a while to notice the benefits of the weight. It also took me some time to tune it right. How would Joe Average notice the benefits? Also, what about beginners?....They can't tell the difference between the best feel vs the worst. What I am saying is that I don't see exactly how Joe and Jane would appreciate the concept if they don't understand what it does and its differences.
Bill Tilden said:Ok! i think i'm going crazy:mrgreen: but i have add 20 gramms more at my prokennex 5G, now it weights 482 gramms.
All the lead tape start from the butt cup and finish at 20 cm from the but cup, so some lead is under my hand, I can generate a lot of power in service and the power seems to be too much for the graundstroke some time the stroke are impressive because i need only give the direction at the ball, and I must have attention during the swing.
The balance of the racquet now is at 24,5 cm from the butt cup.
Now haven't more space in the handl.![]()
![]()
travlerajm said:If your 17-oz rocket launcher gives you an unreturnable serve, who needs groundtrokes? This stick is probably an excellent racquet for volleys because you can just stick it out in front of the ball and let the ball bounce off it. And it's probably good for blocking back big serves. You'll need to get to the net quickly to utilize the advantages of such a heavy frame.
travlerajm said:If your 17-oz rocket launcher gives you an unreturnable serve, who needs groundtrokes? This stick is probably an excellent racquet for volleys because you can just stick it out in front of the ball and let the ball bounce off it. And it's probably good for blocking back big serves. You'll need to get to the net quickly to utilize the advantages of such a heavy frame.
Bill Tilden said:Ok with this rocket launcher I have done another kind of strategy: the serve and serve the volley is not necessary, but this stick is more than exellent for high volleys that have precision and power.
Low volleys are good too, give direction and little back spin
I haven' try well the groundstroke![]()
With surprise after two hours I wosn't too much tired.
This is a question: if I can use this stick with satisfaction, what can do a pros?
Comment on racket power
Given that the ACOR is increased signifcantly by
adding a small mass to the tip of a racket, an
obvious question is whether or not this acts to
increase racket power. In the case of a serve, the
ball speed, v, is given by v ‹ (1 + eA)V where V is
the speed of the racket at the impact point and eA is
the ACOR. The serve speed is therefore directly
proportional to V and depends only weakly on eA.
For example, a 20% increase in V leads to a 20%
increase in serve speed, but a 20% increase in eA,
from say 0.40±0.48, leads to only a 5.7% increase in
serve speed.
Any useful defnition of racket power must
therefore include both the ACOR and the swing
weight of the racket. If the swing weight was
infinite, the racket head speed would be zero. If the
swing weight was zero, the racket head speed would
not be infinite since a player cannot swing his or
her arm that fast. However, within the normal
range of racket weights from about 250 g to about
400 g, it is reasonable to assume that racket head
speed will be proportional to some inverse power of
swing weight, I. The head speed itself depends on
the impact point on the racket. If the racket is
swung at angular velocity x about an axis at a
distance A beyond the butt end of the handle, and
the ball strikes the strings at a distance x from the
tip of the racket, then the velocity of the impact
point is V ‹ (A + L ) x)x. The angular velocity
will depend on the swing weight about that axis,
given by I = Icm + (A + h)². If w = k/In , then the
serve speed is given by
v = k 1 ⁄ eA ƒ– A ⁄ L ÿ x ƒ
Icm ⁄ – A ⁄ h ƒ
2
h i
n
– 14 ƒ
where k is a constant that depends on the strength
of any given player and n is a number, yet to be
determined, that describes the relation between
head speed and swing weight for any given player.
This number is not well known for tennis rackets.
Nevertheless, it is of interest to examine solutions
of Eq. (14) for typical values of n that may be
relevant. For example, if one assumes that the total
energy of the racket, 0.5Ix
2
, remains constant when
the swing weight is varied, then n ‹ 0.5. If the total
energy of the arm remains constant, then n ‹ 0. If
the total energy of the racket plus the arm remains
constant, then n will be less than 0.5. Studies of golf
clubs and baseball bats (Daish 1972; Watts & Bahill
1990) are more consistent with the latter assump-
tion, and indicate that n is typically about 0.2 for
these implements.
Plots of v vs. x for the eA pro®les in Fig. 9 are
given in Fig. 10. It was assumed that the racket
could be swung to generate a serve speed v =
200 km h )1 for an impact at x ‹ 15 cm, when
A ‹ 0.05 m, regardless of the additional mass or
its location. There is no logical reason for such an
assumption, but (a) it provides a convenient if
somewhat arbitrary means of comparing the three
pro®les and (b) the resulting value of n is within
the range of interest between 0 and 0.5. Con-
versely, if one were to arbitrarily assume other
values of n, then the three pro®les would intersect
at different points. The results in Fig. 10 were
![]()
Figure 10 Serve speed v vs. impact distance from the tip, x,
when the angular velocity of the racket is chosen to give
v ‹ 200 km h )1 at x ‹ 15 cm and when the axis of rotation is
5 cm beyond the end of the handle.
R. Cross
12 Sports Engineering (2001) 4, 1±14 · Ó2001 Blackwell Science Ltd
The thing about adding mass to that area, basically, you would not be increasing inertia about the axis of rotation of the racquet handle. Of course, any amount of added mass will increase inertia about other axi, such as the ones about your elbow, shoulder, torso, hips, etc.normrose said:Just a thought having read your last post,
Have you experimented by placing the lead weight directly under where your hand would be normally placed on the handle.
I have tried this and apart from the different feel of the handle due to the intrusion of the lead weight the racquet swings beautifully even though the weight is 42gms.
The racquet in question is a Babolat PD Std.
I would be interested to hear your comments....................Norm
johncauthen said:I have three ideas. One is to add extra weight between eight and nine inches from the butt. I showed it to Wilson, and it became the standard for most graphite racquets. I wanted a job, but didn't get it. I want to help turn this around. I can contribute if given a job with someone like Prince.
Good to see you too!mislav said:Hey TAA, nice to see you.![]()
What would you say would be the minimum weight of a racquet for a male player of average strength? Or optimum?
TennisAsAlways said:Jackson, are you talking about the modified Dunlop?
Anyways, how does the current modded frame that you are referring to handle opponent's "heavy" groundstrokes? How does it handle returning heavy serves? How are the block volleys?
The reason why I ask is because there is a type of setup that I am aware of that enables tremendous pace on serves, AND at the same time it offers plenty of spin, so much that placement of balls are cake! I am wondering if the setup that you came across is anything like what I am referring to. If so, then you should test it under EVERY condition (hitting against the wall, against paceless pushers, agaist HEAVY HEAVY hitters etc..).
Sometimes you might find something that works like a dream....that is, until you test it out and find a flaw in it! That's why I am asking you this. John mentioned something sort of like this too. He mentioned about one of his findings whereas something may work magnificently when practicing, but then when competing under pressure, it just doesn't quite work due to the "cerebral tennis-playing" not being all there in those tense moments.
The problem with that "particaular" setup is with the handling of opponent's heavy groungstrokes (unless you have PLENTY of time to setup your shot so that you can swing ahead fast enough to a degree whereas the the built up momentum from the contributive velocity of the racquethead will overtake the instability of the frame (which is highly unlikely to happen even during standard rally exchanges against NON-pushers)), returning serves, and volleying. The racquet ends up feeling unstable, and vibrates when remaining static. With that setup, the less the racquet is in motion, then the more unstable it is when returning shots; that's why you need to have a full swing AND a extremely fast swing into the ball.
With John's concept (or other setups similar to John's), you get the best of both worlds. You end up with a raquet that is solid, maneuverable, and powerful.
TennisAsAlways said:Good to see you too!
‘‘Minimum’’ weight??? Now that's just too general so I will give you a "general" response: "They should use racquets weighted as heavy as they can handle and that they can swing around comfortably — "usually", the heaviest that would enable the player with the most ball speed."
Coming from me, the way tennis is being played today at higher levels, I would have to say at least 11.5 - 12 ounces should be the minimum weight.
As far as swing weight, there are too many variable that come to play there (e.g. player styles: aggressive baseliner, tremendous spin, S & V, all-courter, etc.; player's forward swing, swing pattern, swing path, backswing, player's timing etc.).
If I had to come up with a figure, I'd say that the minimum SW for a male tennis player of average strength should be at least 310 kg • cm² (For high level tennis — NTRP 4.5 +. I would even actually think the same for the 4.0 level males.). This is all roughly estimates from my observations of people, from my experinces with those people.
P.S. If any of your specs. fall below what I listed, don't feel like less of a man!Plus, it's not like anyone would have to know about it anyways!
Good day now.
Of course it is simply the player.*As for not working underpressure that is just simply the player, the racket can't do everything, other wise there has been 0 complications that I can think of, I put it throught the test and the more I tested the more amazing I thought it was.
TennisAsAlways said:Of course it is simply the player.
What I was describing in my previous post, I was not saying anything in any way as if it were the racquet that dictates everything. I was pointing out the "muscling-the-ball" factor — John commented on this briefly, and so I assumed that you would know what I was referencing to, but it appears that you didn't, hence you wrote back saying: "As for (a racquet weighting setup) working under pressure, it's simply the player." I don't think you would have written that if you knew what I was referring to from the start.
Basically what I was saying is that with a certain type of weighting setup, whereas when in a playing situation, you are using it and happen to be caught up being "out-of-the-zone", exhauted, blurred etc., the racquet becomes unstable (vibrates, tugs around in your hand, etc.) due to the reactive forces against the statical propeties of the racquet setup; the lost of the cerbral playing ability causes a loss of the compensatory action needed to overtake the instability — as how John would describe it (in his own unique way of course). It is more stable when you are in better position, with more time, have the energy to exert fast swings etc.
That's why that setup that I was referring to is not really that ideal, since in real play, you are seldomly ever 100% (consistency, physically, mentally, etc.) throughout the whole entire session.
With the more ideal concept, you can swing late, end up with a slower swing etc., yet the racquet still wouldn't vibrate and become too unstable — which would result in less shank hits, less errors, etc. John mentioned that his concept even enables you to muscle the ball, which is a good thing when you are worn out and need to grind out!
This was what I was referring to. I was NOT speaking as if "individual" player skill was not a factor. I took that indepenent skill factor out of the equation: making it a given that at some point, everybody's abilities will deteriorate to some extent.
P.S. From what you have describe about your setup, you have a high, dynamical, polar weighting setup. I incorporate some of those dynamical properties into my setup as well.
Good day now. 8)
TennisAsAlways said:It seems as if you took what I said a bit too literally. Of course it is up to the player. How could I miss the "obvious"? I didn't, hence it should be apparent that there was an "other" implication. It may be that you are just not understanding the feeling of the particular setup what I am trying to describe, perhaps because you are not familiar with it. Simple as that.
Lastly, who ever said anything about a ‘‘magic stick’’?
I know what racquet that you are referring to now.jackson vile said:Alright this is getting OT, what is your point you are attempting to make![]()
I have given you all the information that I have with out giving away all measurements, and the racket it's self.
This racket feels and performs better than any racket I have ever used, better than new PC600classic or old PC600classic, LM series and all other head rackets, 200gMW90sqin, RDX 90, POGmid, ect
That is just IMO and I expected this racket to be a throw away, I did not even play with it for 1 week after the full mods because I thought it would be trash. My wife picked it up and started causing serious problems (mor than usual) for me on the court, so then I demaned:mrgreen: to have it back and I set forth testing it.
I am ordering up more and will put good string in this time even though it does not need it.
Does this help at all? Oh and the racket is 13oz~ and feels and swings like a 11.5-11.8oz racket, and kicks/whips out of this world.
Your H4 seems like it would hit really well, with that tail weighting. The nCode nSix One is nice with lead added onto the hoop; I prefer most of the mass on the sides (e.g. where you have it: 2-10; and primarily 3-9) and find that it hits nicely without needing any tailweighting. I can't really speak for the 95in² model though, as I've only tried the mid. I'm pretty sure that the 95 feels different. Hey, as long as you like the feel is all that matters.mislav said:Hey TennisAsAlways, John, and others - what do you think?
http://tt.tennis-warehouse.com/showthread.php?t=98733
Is this alongside your recommendations? I have no idea how to calculate the balance though.
tennissavy said:These posts have gone so far off topic that it is absurd. This thread is about certain pros' racquets not what you people are posting. Here is an idea: start another thread.
Good point.jackson vile said:You are a moron, this is what the point of the thread is, we are part of the people that started the John experiements fool![]()
Only in the handle area. That gave me plenty of room for leading it up.jackson vile said:Yea the PS woudl be nicer in a 90sqin, So did you just take out the foam and redistribute the weight?
Good groundstokes. Serve suffered a bit. I fixed that problem by leading up the hoop though (and yes, BTW, I know that the SW of that frame is already high).How did the Hammer work out for you, I was not interested at all in that racket.
Thanks TAA.TennisAsAlways said:Your H4 seems like it would hit really well, with that tail weighting. The nCode nSix One is nice with lead added onto the hoop; I prefer most of the mass on the sides (e.g. where you have it: 2-10; and primarily 3-9) and find that it hits nicely without needing any tailweighting. I can't really speak for the 95in² model though, as I've only tried the mid. I'm pretty sure that the 95 feels different. Hey, as long as you like the feel is all that matters.