# 90º and 30º Rule Review

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1 David Alciatore ( Dr. Dave ) 90º and 30º Rule Review ILLUSTRATED PRINCIPLES Note: Supporting narrated video (NV) demonstrations, high-speed video (HSV) clips, and technical proofs (TP) can be accessed and viewed online at The reference numbers used in the article (e.g., NV 3.4) help you locate the resources on the website. If you don t have access to the Internet, or if you have a 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 The CD-ROM is compatible with both PCs and MACs. Periodically, I will write an article presenting a concise summary of principles from past articles. I think it is useful to review and reflect occasionally to help keep things in perspective and to reinforce important information. I m a teacher in my other life and I know how important repetition and reinforcement are to learning. This article summarizes my previous six articles dealing with the and rules. Hopefully, by seeing all of the results in one place, knowing when and how to apply each rule will become clearer. In my January, 2004 article, I introduced the rule. It states that when the cue ball strikes an object ball with no topspin or bottom spin, the two balls will separate at, regardless of the cut angle. The cue ball leaves along the tangent line, which is perpendicular to the impact line (see Diagram 1). Principle 1 and NV 3.4 summarize and illustrate the important points of the rule. The rule is very useful for helping to prevent scratches (see my January, 2004 article), plan break-up and avoidance shots (see my February, 2004 article), plan carom shots (see my March, 2004 article), and plan cue ball motion for position play (see my March, 2004 article). Principle 1 rule With a stun shot where there is no topspin or bottom spin, after impact the cue ball will depart along the tangent line, which is perpendicular (at a right angle) to the impact line. In other words the cue ball and object ball paths, after impact, will be apart (see Diagram 1, NV 3.4 and TP 3.1). impact line tangent line the deflected object ball and cue ball paths are 90 º apart Diagram 1 The rule impact and tangent lines

2 normal video NV 3.4 rule with various entering angles technical proof TP 3.1 rule The rule applies exactly only for a stun shot, where the cue ball is sliding without topspin or bottom spin at impact with the object ball. Diagram 2 illustrates some of the cases where the rule applies. For the shot in the top-left of the diagram, the cue ball is close to the object ball to begin with, so a center ball hit (or slightly below center) at almost any speed (except very ) is acceptable because the cue ball will not have time or distance to develop forward roll (topspin). For the shot in the top-right of the diagram, the cue ball is a distance from the object ball. In this case, er speed is used to ensure that the cue ball does not develop forward roll. For the shot in the bottom-left of the diagram, the cue ball distance is the same as with the top-right shot; but in this case, draw (bottom spin) is used instead of speed to counteract the effects of forward roll. The bottom spin wears off by the time the cue ball reaches the object ball resulting in stun. For the shot in the bottom-right of the diagram, the cue ball is a large distance from the object ball, and both speed and draw are required to offset the forward roll that would normally develop over the larger distance. any speed (except very ) Diagram 2 Types of shots where the rule applies With many shots, the cue ball is rolling (with topspin) by the time it strikes the object ball (i.e., it won t be in stun). This is where the rule comes in handy. My April, 2004 article introduced the 30º rule, when it applies, and how it is used in practice. My May, 2004 article showed some examples of how the rule can be used to help prevent scratches, plan break-up or avoidance shots, and execute carom shots. In last month s article (June, 2004), I showed how the 30º rule can be used to help you choose between a carom shot and a cut shot for a very interesting example. The key points of the 30º rule are summarized in Principle 2 and illustrated in Diagram 3. The rule states that if the cue ball hits approximately half of the object ball (see Diagram 4), the cue ball will deflect off at very close to from its original path. Note that, unlike with the rule, the angle is measured between the original cue ball path (the aiming line) and the deflected cue ball path (see Diagram 3). The deflected object ball direction is not

3 involved. With the rule, the angle is measured between the deflected cue ball and object ball paths (see Diagram 1). An exact half-ball hit, where the center of cue ball is aimed at the edge of the object ball, is illustrated in Diagram 4. Principle 2 rule When the cue ball hits an object ball with normal roll close to a half-ball hit (see Diagram 4), the cue ball will deflect approximately away from its initial aiming line (see Diagram 3, NV 3.8, NV 3.9, and TP 3.3). The rule applies only when the cue ball is rolling without skidding at object ball impact (see Principle 3). There is a fairly large margin of error. In other words, for a fairly large range of ball-hit fractions (i.e., cut angles), the cue ball path will still deflect by approximately (see Diagram 5). the cue ball s path is deflected by deflected angle aiming line Diagram 3 rule half-ball hit Diagram 4 Half-ball hit normal video NV 3.8 Using your hand to visualize the rule NV 3.9 rule example technical proof TP 3.3 rule

4 Principle 3 Normal roll The cue ball gradually develops normal roll as it slides along the table cloth (see my April, 2004 article and TP 4.1). This is true regardless of what type of vertical spin the ball has (draw, follow, or stun). Normal roll gives a ball the effects of a follow shot. 40º cue ball deflection angle 30º 20º 10º wide margin of error half-ball hit 1/4 1/2 3/4 1 ball-hit fraction Diagram 5 rule wide margin of error technical proof TP 4.1 Time and distance required to develop normal roll Diagram 6 illustrates some of the cases where the rule applies. Remember, it applies only when the cue ball has developed complete forward roll by the time it reaches the object ball, and when the ball-hit fraction is in the approximate range 1/4 to 3/4 (see my April, 2004 article). For the top-left shot in the diagram, the cue ball is close to the object ball, so follow (topspin) is required because the cue ball does not have enough distance and time to develop complete forward roll on its own. For the top-right shot, follow (topspin) is again required because the er speed does not give the cue ball enough time to develop complete roll. In the bottom-left shot, because the cue ball is hit with speed, the cue ball will develop forward roll regardless of the English (except extreme draw). In the bottom-right shot, the large cue-ball distance provides enough time for roll to develop for most speeds and English (except draw shots).

5 any speed any English (except extreme draw) or speed with any English, or with follow Diagram 6 Types of shots where the rule applies My June, 2004 article showed how a carom shot can be much easier to execute than a difficult cut shot. Diagram 7 shows an example where the goal is to carom (deflect) the cue ball off the 1-ball to pocket the 9-ball (instead of trying to cut the 1-ball into the bottom-right corner pocket). The required angular deflection of the cue ball path happens to be exactly 30º. Because of this, there is an extremely large margin of error for the shot (see Diagram 5). You can hit as little as 1/4 and as much as 3/4 of the 1-ball and still have the deflected cue ball path be very close to 30º, and make the shot (see NV A.1). For even a novice player, the shot is very easy to execute. This is a great example of how a little knowledge (in this case, of the 30º rule) can help you easily win a game. 9 carom (kiss) shot off the 1-ball into the 9-ball 1 Diagram 7 Easy carom shot

6 Principle 4 A carom shot is sometimes better than a combo or tough cut When available, a carom shot with normal roll is usually a better option than a difficult combination shot or an extreme cut shot. The margin of error for a rolling carom shot is fairly large (see Diagram 5), provided the speed is. normal video NV A.1 - Cut shot vs. carom shot example I hope my last six articles have helped you appreciate the importance of the 90º and 30º rules. These principles are not new they are presented in various forms in many pool and billiards books. However, many people still don t appreciate the value of the principles or know when and how to apply them properly (especially the 30º rule). My goal in this series of articles was to heighten awareness of these principles and help make it clear when they apply. I hope you have been or will be able to incorporate these useful tools into your game. Have fun and practice hard, Dr. Dave PS: If you want to refer back to my previous articles, you can access them online at: If you like my HSV super--motion billiards video clips online, you might also be interested in my large collection of non-billiards clips viewable at: Dr. Dave is a mechanical engineering professor at Colorado State University in Fort Collins, CO. His book, The Illustrated Principles of Pool and Billiards, is coming out next month.

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