Summary: David Alciatore, PhD ("Dr. Dave") ILLUSTRATED PRINCIPLES
"Squirt Part III: follow/draw squirt and swerve"
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 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. See the website for details.
This is the third article in a series dealing with "squirt." So far, we have looked at basic
terminology, the physics behind squirt, and some experimental results. To refresh your memory,
squirt, also called deflection, refers to the angular change in the initial cue ball (CB) direction
due to an off-center hit. In other words, when you use English, the CB doesn't go where you are
aiming because of squirt. For more background information, see my August '07 article and refer
to NV 4.13 and NV A.17. When using English, it is also important to be aware of the effects of
swerve (see NV 4.14 and NV 7.12) and throw (see NV 4.15, NV 4.16, NV A.21, and my August
'06 through July '07 articles). Sometimes, the term "effective squirt" is used to refer to the net
effect of both squirt and swerve on the shift in the CB position at object ball (OB) impact (see my
August '07 article for more information). If you want to refer back to any of my past articles, they
are all available on my website (billiards.colostate.edu).
NV 4.13 Squirt due to high speed English