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Adjusting Aim for Throw

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It is important to understand how friction between the CB and OB can change the direction of the OB. This effect is called throw. Throw is not very large with fast speed shots, and it is less when the CB has topspin or bottom-spin, but the effect can be significant with slower-speed shots, especially with stun. When throw is due to cut angle alone, the effect is called cut-induced throw (CIT):

cut-induced throw (CIT)

And when it is due to sidespin, it is called spin-induced throw (SIT):

spin-induced throw (SIT)

Many important throw effects are demonstrated in the following video:

Examples of how throw can be used to your advantage can be found here: throw shot examples

And a summary of how throw varies for different types of shots can be found here: squirt, swerve, and throw effects

One way to deal with throw is to eliminate it with "gearing" outside english, as covered in the following video:

Here's a summary of the basic things you need to know about throw in your game:

  1. Be aware of the maximum throw you can get with the ball conditions under which you play. Maximum throw is generally about 1 inch per foot of CB travel, which is about 5 degrees.
  2. CIT is largest for slow-speed stun shots close to a 1/2-ball hit.
  3. To get maximum SIT, use stun, slow speed, and about 50% of maximum sidespin.
  4. Throw is smaller with follow and draw shots (about 1/2 with maximum bottom spin and full-roll topspin).
  5. To adjust your aim to compensate for CIT, aim to overcut the shot slightly (i.e., hit a little thinner, or hit a little less of the ball) or use gearing outside english. The shots you must absolutely change your aim to compensate for throw are slow stun shots close to and larger than a 1/2-ball hit (maximum throw), slow roll shots (about half of maximum throw), and shots with an amount of sidespin much different than the gearing outside amount of spin.
  6. You must adjust for throw when aiming frozen or small-gap combination shots (see the combo shot aiming resource page).
  7. Be aware of all squirt/swerve/throw effects so you will be able to understand and plan for a wide range of situations.
  8. Wipe chalk marks off the CB every chance you get (before the break and with ball in hand) to prevent cling/skid/kick.

The How To Aim Pool Shots (HAPS) DVD series covers in detail how to adjust for throw when aiming all sorts of shots.

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