Summary: David Alciatore ("Dr. Dave") ILLUSTRATED PRINCIPLES
"Throw Part XI: everything you ever wanted to know about throw"
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 eleventh article in my series dealing with throw and English effects. If you are
tired of reading about throw, don't despair ... I'm almost done. I'll conclude next month with my
final article in the series. So far, I've looked at basic terminology, examples of where throw can
help you or hurt you in game situations, the effects of cut angle and speed, the effects of follow
and draw, spin-induced throw, the difference between inside and outside English, the
combination of spin- and collision-induced throw effects, spin transfer, and the big picture of
squirt, swerve and throw. If you want to refer back to any of my past articles, they are all
available on my website (billiards.colostate.edu).
To refresh your memory, throw is change in object ball (OB) direction due to sideways
forces between the cue ball (CB) and object ball during impact. NV 4.15, 4.16, 7.5, 7.6, and
A.21 show examples of both collision-induced throw (CIT) and spin-induced throw (SIT).
When using English, in addition to understanding throw, it is also important to understand the
effects of squirt (see NV 4.13 and NV A.17) and swerve (see NV 4.14 and NV 7.12). See the