Clearly I'm not making sense. As such, we better just completely disregard the opinions of the worlds leading experts on the subject. lol
As for whether or not I can demonstrate the effect myself....definitely. It's most obvious when playing position, when you have to roll up near another ball in the racking area. As the cue ball comes to rest, it suddenly falls into a divot, pushing up frozen against the other ball that's in an adjacent divot. Once you find yourself snookered a few times as a result of the divot left by the rack, you'll quit dismissing the opinions of those who play under such conditions for a living.
Pro's can be wrong, but normally when it comes to stuff like this, their experience far out weighs the validity of our own opinions.
since bob jewett IS one of the worlds leading authors on the behaviors of billiard balls on the table, and has been published many times, often with cumbersome mathematical details, and is known for such publications by all who seriously study the game, would you mind telling us some of your qualifications.
Specifically, have you done any controlled experiments to assess the real world implications of cloth divots?
Can you list some of the worlds leading experts on the subject that you have referenced?
I am not being facetious, I really want to know if you can disprove what he is saying as i am interested in all 3 racking options (sardo, magic, delta):
for reference, here are some of his billiard digest articles:
1992-04 Be Part of an Experiment -- cutting a ball frozen on the rail
1992-06 An Experiment in Curve -- making an object ball curve
1992-10 The Truth at Last -- results from the frozen ball experiment
1992-12 Progressive Practice -- explanations and two drills
1993-04 Close Calls -- judging hits when two object balls are close
1993-06 Close Quarters -- a system for aiming when the object ball is close
1993-08 Close Quarters II -- avoiding double hits on a near object ball
1993-10 Close Quarters III -- the rules governing close shots
1993-12 Test Time -- Questions from the BCA instructor course
1994-04 How Tough is Tough? -- calculating the difficulty of shots
1994-06 Test Time -- The Answers -- answers to the BCA quiz
1994-08 Squirt Testing -- using a tough spin shot to test squirt
1994-10 Bytes & Billiards -- billiards on the internet in 1994
1994-12 Bytes and Billiards II -- several billiard simulators described
1995-02 Pythagoras & Pool Perpendiculars -- the 90-degree rule
1995-04 Friction: Friend and Foe -- three types of table friction
1995-06 Seeking Truth of Beliefs -- several myth-destroying results
1995-08 Virtual Pool -- a review of the pool/billiard simulator
1995-10 Follow and Draw Systems -- judging the carom angle with follow and draw
1995-12 A Basic Skill Test -- measure your ability with progressive drills
1996-02 Two Interference Systems -- the 2-times- and 10-time-fuller systems
1996-04 Bad Equipment -- problems you can have with tables, balls, ...
1996-06 Chances Are -- probabilities and billiards
1996-08 Create Your Own Drills -- developing custom progressive drills
1996-10 Mirror Systems -- banking using the equal angle idea
1996-12 Handicaps -- the basic NPL system of handicapping matches
1997-02 Hidden Hanger -- shots that are much easier than they seem
1997-04 Finding the Pocket -- the effective center of the pocket
1997-06 Collective Wisdom -- excerpts from the RSB FAQ
1997-08 Those Who Can, Teach -- several teaching techniques/demos
1997-10 A Safety Dance -- playing safe on a close ball ... what's legal?
1997-12 Welcome to Masse 101 -- basic masse concepts
1998-02 Masse 102 -- masse techniques and practice
1998-03 The Right Time to Masse -- sometimes it's the right shot
1998-04 Side Spin with a Kick -- progressive practice for simple english shots
1998-05 Putting Proper Spin On It -- side spin theory and practice
1998-06 Spin It In -- does get-in english really exist?
1998-07 Complete Breakdown -- computer simulation of stick physics
1998-08 1,001 Banks -- lots of bank practice shots
1998-09 Battle of the Robots -- the Meucci and Predator cue-testing robots
1998-10 Peeling the Onion -- options during run-outs
1998-11 Hitting the Peaks -- when during the stroke to hit the cue ball
1998-12 Cut to the Chase -- follow angle system 1:4 ratio
1999-01 Making Contact -- driving a ball to a cushion
1999-02 More Spin, Less Speed -- quality of the stroke
1999-03 Progressive Progress -- more practice drills
1999-04 Freeze Frame -- Jacksonville project report
1999-05 Judgement Call -- to call or not to call fouls
1999-06 Don't Grip It and Rip It -- Jacksonville cue impact study
1999-07 To Kiss Or Not To Kiss -- finding which bank shots kiss out
1999-08 Judgement Day -- Results for the May 1999 column
1999-09 The New Frontiers -- increasing your comfort zone
1999-10 Communication Barriers -- pool vocabulary
1999-11 Systems of Aiming -- a smorgasbord of systems
1999-12 Hidden Treasures -- three diamond systems
2000-01 Tricky Business -- learning from trick shots
2000-02 Sources of Evil -- variables on the pool table
2000-03 Add It Up -- summing up sources of error
2000-04 A Rub the Right Way -- details of throw
2000-05 Practice Session 2000 -- the game of Fargo
2000-06 Systems Analysis -- details of three aiming systems
2000-07 A Rusty Game? -- straight pool discussion
2000-08 Into Focus -- Pre-shot routine and concentration
2000-09 Wales, Watching -- A report on the 2000 WPC in Wales
2000-10 Jump Shots -- useful jump shots
2000-11 Half-Ball, Revisited -- half-ball summary
2000-12 Bank Losses, Rolling Ratios -- follow and bank distance ratios
2001-01 Combinations and Throw -- how throw affects close combos
2001-02 Newton on the Ball -- George McBane guest column on 90-degree imperfections
2001-03 Weird Techniques -- strange ways to hit balls
2001-04 Three Draw Drills -- three challenging drills
2001-05 Charting the Course -- how to find follow distances geometrically
2001-06 Drawing Draw -- continued for draw and angle shots
2001-07 The Rack -- It's more than a torture device
2001-08 When Spheres Collide -- ball-ball contact and Hertz' Law
2001-09 Sliding Friction -- ball-to-bed-cloth friction measured
2001-10 Playing Games -- trying games strange to you
2001-11 Round Robin Formats -- basic round-robin charts
2001-12 Elimination Formats -- single elim, byes, seeding
2002-01 Double-Elimination Formats -- two double-elimination formats
2002-02 8-Ball Rules -- a brief history of the rules of 8-ball
2002-03 Who Wants a Spot -- calculating the odds with unequal players and spots
2002-04 Outside Assistance -- using outside english to help the angle
2002-05 9-Ball Progress -- progressive drills for nine ball
2002-06 A Challenge to Improve -- some tough proposition shots
2002-07 99 Critical Points -- problems in Ray Martin's classic book
2002-08 Squirt -- a Review -- history of squirt in billiard literature
2002-09 Squirt -- Where it Comes From -- the physical cause of squirt
2002-10 Squirt Continued -- dealing with squirt
2002-11 Chalk Marks, Cue Marks -- chalking -- a simple but important task
2002-12 An Experiment in Throw -- a test to see if throw exists
2003-01 One Thing at a Time -- implementing Bob Fancher's idea for practice
2003-02 Physics and Pool? -- is physics useful for playing billiards
2003-03 Experimental Results -- readers' new ideas about throw
2003-04 The Results Are In -- numerical results for the throw experiment
2003-05 Progressive Masse -- some drills to improve your masse
2003-06 Handicapping 14.1 -- instructions for setting up a league
2003-07 Odds and Ends -- making a ball curve, frozen rail shots, a throw demo, banks
2003-08 Bumping Balls -- moving balls precisely
2003-09 Jumping As It Should Be -- practicing jump shots
2003-10 Sharks and Scams -- petty thievery for fun and profit
2003-11 Practicing Inside Spin -- progressive drills for inside
2003-12 Practicing Outside Spin -- more progressive drills
2004-01 Thin Hits -- safeties and cut shots
2004-02 Where's Your Elbow -- Do you want to be a piston or a pendulum?
2004-03 Where's Your Elbow Now -- observations, including at the Mosconi Cup
2004-04 Not So Simple -- keeping the run simple
2004-05 Short Kicks -- using the mirror system for balls by the rail
2004-06 More Aiming Systems -- ferrule system, lights system, overlap system
2004-07 Long Kicks -- mirror system training
2004-08 Shortening Banks -- actual measurements about speed vs. angle
2004-09 Short Banks -- the 70% system for cross-side and cross-corner
2004-10 Useful Strokes -- From Wallace Ritchie to Bob Byrne
2004-11 Stroke Straightening -- making your arm move straight
2004-12 Help With Aiming -- aiming devices, including do-it-yourself
2005-01 Make Your Own -- more aiming/carom angle devices
2005-02 Frozen Bank Shots -- banking balls frozen on the cushion
2005-03 Hoppe to It -- making your own simple position system -- no english
2005-04 Do Try This At Home -- now, add side spin
2005-05 Faszinating -- amazing stop-action pictures from Austria
2005-06 By the Books -- parallel aiming through the years
2005-07 Target Pool, Revived -- Do-it-yourself practice routines
2005-08 Close Quarters -- repeat of the August 1993 column
2005-09 Taking A Lesson -- various aspects of taking and giving lessons
2005-10 Different Strokes -- a catalog of strokes
2005-11 Different Strokes, Part 2 -- more catalog of strokes
2005-12 Wrong Size, Wrong Shape -- the balls are not quite right
2006-01 A Modest Proposal -- Double hit rule discussion
2006-02 Better Safe Than Sorry -- Shot selection at the IPT KOH
2006-03 A Carom Puzzle -- How many ways to play one position?
2006-04 Straight-Pool Wrinkles -- Issues at the DCC 2006 14.1
2006-05 Wheres The Rub? -- Throw with draw and follow
2006-06 Straight Statistics -- High run statistics at 14.1
2006-07 Carom Conundrum -- Solutions for the carom puzzle of March
2006-08 The Perfect Tournament -- Details of tournament organization
2006-09 One Cushion Precision -- Playing for exact position on one cushion
2006-10 The Cutting Edge -- The thinnest possible/likely cuts
2006-11 Round-Robin Revisited -- Round robin wrinkles from the IPT
2006-12 Don't Blow It -- Where's the nose of the cushion?
2007-01 Get to the Point -- Precise position practice
2007-02 Online Magic -- YouTube videos from Semih Sayginer
2007-03 Derby City Shootout -- The 2007 edition of DCC 14.1
2007-04 Transferred Side -- History of the controversy
2007-05 Lets Twist Again -- Shots with transferred side
2007-06 Degrees of Difficulty -- Cutting and banking more than 90 degrees
2007-07 Divide and Conquer -- Fractional ball aiming
2007-08 Many Questions -- Some close combination puzzles with answers
2007-09 Killer Geometry -- The semi-circle of death
2007-10 Active Spectating -- What to watch for at tournaments
2007-11 Scratched to Death -- Extensions of the semicircle of death
2007-12 Tricky Ticky Tactics -- Lots of ways to use rail-first shots
2008-01 The Letter of the Law -- The new WPA World Standarized Rules
2008-02 Killing Me Softly? -- The soft break and nine ball
2008-03 Freezing to Death -- How a tight rack destroys nine ball
2008-04 Measured Force -- Ten degrees of force of stroke