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David Alciatore ("Dr. Dave") ILLUSTRATED PRINCIPLES The 30 rule

Summary: David Alciatore ("Dr. Dave") ILLUSTRATED PRINCIPLES
The 30 rule:
Part III Carom vs. Cut
Note: Supporting narrated video (NV) demonstrations, high-speed video (HSV) clips, and
technical proofs (TP) can be accessed and viewed online at billiards.colostate.edu. The
reference numbers used in the article (e.g., NV 3.8) help you locate the resources on the
website. If you don't have access to the Internet, or if you have a slow connection (e.g., a
modem), you may want to view the online resources from a CD-ROM. To order one,
send a check or money order (payable to David Alciatore) for $21.45 to Pool Book CD;
626 S. Meldrum St.; Fort Collins, CO 80521. The CD-ROM is compatible with both PCs
and MACs.
As I pointed out in my last two articles, if you don't know the 30 rule yet, learning it can truly
transform your game. Like the 90 rule presented in my previous series of three articles, the 30
rule helps you predict the path of the cue ball after impact with an object ball. You might recall
that the 90 rule applies only for stun shots, where the cue ball strikes an object ball with no
topspin or bottom spin. However, with many shots the cue ball is rolling (with topspin) by the time
it strikes the object ball. This is where the 30 rule comes in handy.
My article two months ago (April, 2004) introduced the 30 rule, when it applies, and how it is
used in practice. My previous article (May, 2004) showed some real examples of how you can
use the rule in your game to prevent scratches, plan break-up or avoidance shots, and execute


Source: Alciatore, David G. - Department of Mechanical Engineering, Colorado State University


Collections: Engineering