FAQFAQSpeed Control in Pool and Billiards

... how to judge and control speed in various types of pool shots.

Dr. Dave's answers to frequently-asked questions (FAQs), mostly from the AZB discussion forum

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for more information, see Sections 3.03 and 5.02 in The Illustrated Principles of Pool and Billiards
and Disc I of the Video Encyclopedia of Pool Shots

 


ball speeds and travel distances

How do cue ball and object ball speeds and travel distances vary with cut angle?

For stun shots, see the graph and summary statements on page 2 of:

TP 3.2 - Ball speeds and distances after stun-shot impact

For roll shots, see the graph and summary statements on page 3 of:

TP A.16 - Final ball speeds, distances, and directions for natural roll shots

and see:

TP B.5 - Rolling CB, direct-hit hop and ball travel distances

Here are some useful conclusion statements from the analyses:

"Fundamentals - Part VII: speed control" (BD, March, 2009) also provides some good illustrations and examples.

 

What is tip height on the cue ball results in the best speed and distance consistency?

See optimal tip height for speed control.

 


drills and advice

Where can I find general advice and drills for improving speed control?

See "Fundamentals - Part VII: speed control" (BD, March, 2009).

Target practice drills are also very helpful for developing CB speed and position control.

The following stun shot drill is also helpful for improving speed control: NV D.8 - Stun Shot Drill - from Vol-II of the Billiard University instructional DVD series.

 


optimal tip height for speed control

Where is the best height to hit the cue ball for speed and distance control and consistency?

To help achieve the best speed and distance consistency, it is best to hit the CB at about 20% of the radius above the center (0.2R), which is about 60% of the total ball height (see "d" in the illustration below). For illustrations and explanations, see "The Lag Shot" (BD, October, 2011) and "How High or Low Should You Hit the Cue Ball?" (BD, September, 2011). Hitting above center can also result in a more accuracy with CB direction (see follow accuracy).

 

cue tip contact-height effects

 


rail cushion speed change

How much speed does the CB lose when it rebounds off a rail cushion?

For steep angles into a rail, where the CB path is close to perpendicular to the rail (i.e., almost straight into the rail), the CB loses about half of its speed after rebound and skid. For more information and demonstrations, see:

HSV B.15 - straight-on kick shot rebound losses and spin changes for roll, stun, and draw shots

At very shallow angles to the rail, where the CB is moving almost parallel to the rail, very little speed is lost off the rebound.

 


typical speeds for a range of shots

How fast does the CB travel for a range of shots?

Here are some typical values for various shot "speeds" in miles per hour (mph), feet per second (fps), inches per second (ips), centimeters per second (cm/s) and meters per second (m/s):

soft touch: <1 mph = <1.5 fps = < 18 ips = < 45 cm/s
slow: 1-2 mph = 1.5-2.9 fps = 18-35 ips = 45-89 cm/s
medium: 2-4 mph = 2.9-5.9 fps = 0.89-1.9 m/s
fast: 4-7 mph = 5.9-10.3 fps = 1.9-3.2 m/s
power shot: 7-10 mph = 10.3-14.7 fps = 3.2-4.5 m/s
powerful break: 25-30 mph = 37-44 fps = 11-13 m/s
ridiculously powerful break: 35 mph = 51 fps = 16 m/s

One way to characterize different shot speeds is in terms of "table lengths of travel." Refer to TP B.6 - Cue ball table lengths of travel for different speeds, accounting for rail rebound and drag losses to see how shot speed and "table lengths of travel" are related.


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