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Billiards Digest January, 2009 David Alciatore, PhD ("Dr. Dave") ILLUSTRATED PRINCIPLES

Summary: Billiards Digest January, 2009
David Alciatore, PhD ("Dr. Dave") ILLUSTRATED PRINCIPLES
"Fundamentals - Part V: CB position control"
Note: Supporting narrated video (NV) demonstrations, high-speed video (HSV) clips, and
technical proofs (TP), and all of my past articles, can be accessed and viewed online at
billiards.colostate.edu. The reference numbers used in the article help you locate the
resources on the website. If you have a slow or inconvenient Internet connection, you
might want to view the resources from a CD-ROM or DVD. Details can be found online
at: dr-dave-billiards.com.
This is the fifth article in a series on fundamentals. In the last four months, I've covered the
stroke, the basics of aiming, issues involved with cut-shot aiming systems, and the effects of
bridge length. This month we will start looking at important issues related to cue ball (CB) control.
An important skill in pool, beyond pocketing balls, is being able to predict fairly accurately where
the CB will go during a shot. This skill is useful for avoiding scratches (e.g., see NV 3.7, NV 3.10,
and NV B.46), playing position for the next shot (e.g., see NV 5.1 and NV 5.2), and planning and
executing carom shots (e.g., see NV 7.2-7.4 and NV B.46) and break-out shots (e.g., see NV
B.46). Diagram 1 illustrates several reference lines that are useful in predicting the CB's path
and direction. The first and most well known reference line is the tangent line predicted by the
90 rule (the blue shot in the diagram). For a stun shot (AKA a "stop shot at an angle"), where the
CB is sliding with no top or bottom spin at object ball (OB) impact, the CB will head exactly in the


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


Collections: Engineering