Quantcast
nodot nodot
Wild Cards
June 2006 Article

Latest Wild Cards Article

Wild Cards Archives:
2004 - 2014
1998 - 2003

Tennis Server
HOME PAGE

Do You Want To Be A Better Tennis Player?

Then Sign Up For A Free Subscription to the Tennis Server INTERACTIVE
E-mail Newsletter!

You will join 25,000 other subscribers in receiving news of updates to the Tennis Server along with monthly tennis tips from tennis pro Tom Veneziano that won't be found on the web site.
 
Best of all, it is free!

Player Profiles:
 
Top Pros (Women)
tennis ball Serena Williams
tennis ball Simona Halep
tennis ball Petra Kvitova
tennis ball Maria Sharapova
tennis ball Agnieszka Radwanska
tennis ball Na Li
tennis ball Eugenie Bouchard
tennis ball Angelique Kerber
tennis ball Caroline Wozniacki
tennis ball Ana Ivanovic
 ... more profiles
 
Top Pros (Men)
tennis ball Novak Djokovic
tennis ball Rafael Nadal
tennis ball Roger Federer
tennis ball Stanislas Wawrinka
tennis ball David Ferrer
tennis ball Milos Raonic
tennis ball Tomas Berdych
tennis ball Kei Nishikori
tennis ball Marin Cilic
tennis ball Grigor Dimitrov
 ... more profiles
 
Tennis Features Icon TENNIS FEATURES:

BETWEEN THE LINES - Ray Bowers takes an analytical and sometimes controversial look at the ATP/WTA professional tour.
 
PRO TENNIS SHOWCASE - Tennis match reports and photography from around the world.
 
TURBO TENNIS - Ron Waite turbocharges your tennis game with tennis tips, strategic considerations, training and practice regimens, and mental mindsets and exercises.
 
TENNIS ANYONE? - USPTA Pro John Mills' quick player tip.
 
WILD CARDS - Each month a guest column by a new writer.
 
TENNIS SET - Jani Macari Pallis, Ph.D. looks at tennis science, engineering and technology.
 
MORTAL TENNIS - Greg Moran's tennis archive on how regular humans can play better tennis.
 
MENTAL EQUIPMENT - Explore the mental side of the game with Dr. John Murray.
 
TENNIS WARRIOR - Tom Veneziano's Tennis Warrior archive.
 
HARDSCRABBLE SCRAMBLE - USPTA pro Mike Whittington's player tip archive.
 
TENNIS EQUIPMENT TIPS.

Tennis Community Icon TENNIS COMMUNITY:


Tennis Book, DVD, and Video Index
 
Tennis Server Match Reports
 
Editor's Letter
 
Become a Tennis Server Sponsor

Explore The Tennis Net Icon EXPLORE THE TENNIS NET:

Pro Tennis Calendar & Event Links
 
Tennis News and Live Tennis Scores
 
Tennis Links on the Web
 
nodot
Wild Cards
 
Green Dot
 
Tennis Warehouse Logo
 
Green Dot

 
nodot
Grip Tightness
by Dr. Howard Brody
Physics Department
University of Pennsylvania

It is thought by most tennis scientists and engineers that grip tightness has almost no effect on the power you get from a racket. This conclusion is based on both theoretical analysis and from data obtained in laboratory testing. Having stated a conclusion, I must now justify that position.

Theory

When a ball strikes the strings of a racket, a wave propagates down the frame toward the handle. When the wave reaches the butt end of the free racket or the hand holding the racket or a clamp holding the handle in place, part of that wave is reflected back toward the ball. The type of reflection depends on how the handle is held (free, clamped, hand-held). It is not until that reflected wave gets back to the ball that the ball can tell how the butt end of the racket is held. If the ball has left the strings before the reflected wave gets back to it, the ball CANNOT know whether the racket was free or clamped or hand-held.

For typical ball dwell times on the strings (5 milliseconds), the reflected wave does not return in time to influence the ball. Therefore, the ball will come off the strings in the same way for a clamped handle, free handle or hand-held handle.

Experiments and Observations

When a free racket is struck near the tip or the throat, it vibrates at 125 to 200 times per second (125 to 200 Hz- the stiffer the fame, the higher the frequency). When a racket with its handle clamped is struck in a similar manner, it vibrates at 25 to 50 Hz. When a hand-held racket is struck near the tip or throat it vibrates at almost the same frequency as the free racket, even when held as tightly as possible. This is strong evidence that a hand-held frame behaves in the same manner as a free racket. This result is probably due to the fact that the human palm, hand, etc are very soft and flexible compared to the stiff, graphite reinforced composite rackets in use today.

When rackets are tested in the lab for their rebound power, the freely suspended racket responds almost in the same way as the clamped racket, leading us to believe that a hand-held racket will behave in the same manner as a free racket will. For some rackets there is a slight difference in racket response (free vs clamped) when the ball impacts close to the throat where the round-trip of the propagating then reflected wave might arrive just as the ball is departing.

It is sometimes stated that a tight grip is necessary to keep the racket from twisting relative to you hand on off-axis impacts. This is not true. Just watch a 5 year-old play tennis. The kid has a very weak grip, hits the ball all over the racket head, and yet you do not see the racket twisting relative to the youngster’s hand. The racket does twist on an off-axis impact, but the hand twists along with it.

As a final test of the independence of racket power vs grip tightness, I took an old wood racket and installed a completely flexible hinge in the shaft. There was no way that the ball/racket head could know about the grip tightness since they were connected to the handle via the flexible hinge. I was able to play tennis with this (illegal by ITF rules) racket and get a great deal of power on groundstrokes and serves. I could not volley with it. I gave this racket to many players and they had little trouble playing tennis with it. (Some of this is documented in the Braden-Brody video "The Science and Myths of Tennis.")

Conclusion One needs to hold the racket only tight enough to be able to control it during the swing and to keep it from being knocked out of your hand.

Also by Dr. Brody:

The Physics and Technology of Tennis by Howard Brody, Rod Cross, and Crawford Lindsey.


If you wish to provide a comment to the author of this Wild Cards column, please use this form. Tennis Server will forward the comment to the author.

Green DotGreen DotGreen Dot

Wild Cards Archives:
1998 - 2003 | 2004 - 2014


If you have not already signed up to receive our free e-mail newsletter Tennis Server INTERACTIVE, you can sign up here. You will receive notification each month of changes at the Tennis Server and news of new columns posted on our site.

This column is copyrighted by the author, all rights reserved.


 

nodot
nodot
Google
Web tennisserver.com
nodot nodot
The Tennis Server
Ticket Exchange

Your Source for tickets to professional tennis & golf events.
 
Chris Evert Pro-Celeb Tennis Classic 11/22-11/23
 
BNP Paribas Open Tickets Indian Wells CA 3/11-3/22
 
Miami Open Tennis Tickets Miami 3/23-4/5
 

 

Tennis MindGame

 
Popular Tennis books:
 
Smart Tennis by John Murray
 
Winning Ugly: Mental Warfare in Tennis-Lessons from a Master by Brad Gilbert, Steve Jamison
 
The Best Tennis of Your Life: 50 Mental Strategies for Fearless Performance by Jeff Greenwald
 
The Inner Game of Tennis by W. Timothy Gallwey
 
Most Recent Articles:
 
Tennis Warrior: In Tennis, Principle Trumps Emotion by Tom Veneziano.
 
September 2014 Tennis Anyone: Things To Do and Not To Do by John Mills.
 
September 2014 Turbo Tennis: The Only Thing You Have To Fear Is Fear Itself!!! by Ron Waite.
 
September 9, 2014 Between The Lines: Dissecting U.S. Open 2014 by Ray Bowers.
 
August 21, 2014 Between The Lines: Preview U.S. Open 2014 -- Focus Youth Brigade by Ray Bowers.
 
August 2014 Wild Cards: The Tennis Round Table: Interviews With Jim Courier, Todd Martin & Mark Philippoussis in Arizona by Vince Barr.
 
Tennis Warrior: The Little Tennis Girl Who Could by Tom Veneziano.
 
August 2014 Tennis Anyone: Try To See The Big Picture by John Mills.
 
August 2014 Turbo Tennis: My Most Useful 'Quick Fix' Tips!!! by Ron Waite.
 
May 2014 Wild Cards: Michael Chang Wins Cancer Treatment Centers of America Tennis Challenge in Arizona by Vince Barr.
 

 

 

 

 
 
Featured events in the Tennis Server Ticket Exchanges:
 
  Featured Tickets:
BNP Paribas Open Tickets Indian Wells CA Tennis Garden
Miami Open Tennis Tickets Miami Key Biscayne FL Crandon Park Center
 

  Featured Tickets:
AT&T National Golf Tickets Bethesda MD Washington DC Congressional Country Club
US Senior Open Golf Tickets Omaha NE Omaha Country Club
Bridgestone Invitational Golf Tickets Akron OH Firestone Country Club
PGA Championship Golf Tickets Rochester NY Oak Hill Country Club
Dick's Sporting Goods Open & Tim McGraw Tickets Endicott NY Enjoie Golf Course
Solheim Cup Tickets Parker Denver CO Colorado Golf Club
2013 Presidents Cup Tickets Dublin Columbus OH Muirfield Village Golf Course
Masters Golf Tournament Tickets Augusta GA National Golf Club
2014 US Open Golf Tickets Pinehurst NC Resort
2014 Ryder Cup Tickets Auchterarder Scotland UK Gleneagles Golf Course

  Featured Tickets:
PGA Championship Golf 7 Day Pass Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Monday Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Tuesday Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Wednesday Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Thursday Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Friday Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Saturday Tickets Rochester NY Oak Hill Country Club
PGA Championship Golf Sunday Final Tickets Rochester NY Oak Hill Country Club

  Featured Tickets:
Masters Golf Tournament Tickets Sunday Competition Augusta GA National Golf Club
Masters Golf Tournament Tickets Saturday Competition Augusta GA National Golf Club
Masters Golf Tournament Tickets Friday Competition Augusta GA National Golf Club
Masters Golf Tournament Tickets Thursday Competition Augusta GA National Golf Club
Masters Golf Tournament Tickets 4 Four Day Badge Augusta GA National Golf Club
Masters Golf Tournament Tickets Wednesday Practice Round Augusta GA National Golf Club
Masters Golf Tournament Tickets Tuesday Practice Round Augusta GA National Golf Club
Masters Golf Tournament Tickets Monday Practice Round Augusta GA National Golf Club

  Featured Tickets:
US Open Golf Tickets Final Round Sunday Fourth 4th Pinehurst NC Resort 2014
US Open Golf Tickets Third 3rd Round Saturday Pinehurst NC Resort 2014
US Open Golf Tickets Second 2nd Round Friday Pinehurst NC Resort 2014
US Open Golf Tickets First 1st Round Thursday Pinehurst NC Resort 2014
US Open Golf Tickets Wednesday Practice Round Pinehurst NC Resort 2014
US Open Golf Tickets Tuesday Practice Round Pinehurst NC Resort 2014
US Open Golf Tickets Monday Practice Round Pinehurst NC Resort 2014
US Open Golf Weekly Pass Tickets Pinehurst NC Resort 2014

 
 
"Tennis Server" is a registered trademark and "Tennis Server INTERACTIVE" is a trademark of Tennis Server. All original material and graphics on the Tennis Server are copyrighted 1994 - by Tennis Server and its sponsors and contributors. Please do not reproduce without permission.

 

Tennis Server
Cliff Kurtzman
Editor-in-chief
2323 Clear Lake City Boulevard
Suite 180-139
Houston, Texas 77062-8120
Phone: (281) 480-6300
Fax: (281) 480-7715
Online Contact Form
How to support Tennis Server as a Sponsor/Advertiser
Tennis Server Privacy Policy