SpiderMan

06-09-2005, 09:08 AM

Fast Larry is right about ELEVATING for power draw, and the one-fits-all rote instruction you often see and hear is inadequate <font color="red">for this type of shot</font color> .

Over years of playing, I too seemed to notice that, for long draw shots where the cueball and object ball are far apart, jacking up a little allowed me to get more draw without golfing the cueball into the air.

When my nerdy analytic mind first considered the "why" of this working, I thought that perhaps I was preserving my backspin by adding a little bit of "jump" to the shot and limiting contact with the cloth. But I discounted that theory because, even if you get as level as possible, you still get air time on a hard draw shot. Prove it to yourself by putting coins in front of the cueball.

<font color="red">My current position is that it's a matter of squirt and compensation, same as when using sidespin.</font color>

Consider what happens when you put right on the cueball - it's path "squirts" a little to the left. So, to make the shot, you also compensate by aiming a little to the right. This launches the spinning cueball straight along your original intended line-of-aim.

See where I'm going? Use right spin, cueball squirts left, so aim a little right to compensate. <font color="red"> USE BOTTOM SPIN, CUEBALL SQUIRTS UP, SO AIM A LITTLE DOWN TO COMPENSATE</font color>. The "launch trajectory" of the cueball may actually be closer to horizontal when aiming down, than when applying a similar amount of level-cue backspin.

<font color="red">Like it or not, we play pool in three dimensions. When you draw with a level cue, you "squirt" the cueball into the air. Use this in an all-out power-draw situation, without compensating your aim downward, and you may be playing on the floor.</font color>

Larry also notes that each player's "ideal" angle will be a little different. I suspect this is tied to the squirt characteristics of the cues. This would imply that players using low-squirt cues such as the predator 314 should need less jack-up than players using shafts with higher effective end mass. I wonder if anyone has made this observation?

Finally, to address the comments regarding hitting the cueball a little higher when you jack up - yes, this is true. But you still get the same amount of "retrograde" rotation, because this is totally a function of how far your cue's line of travel is offset from the cueball's center of mass. Think about it - if you jack up far enough, you can get lots of backspin even hitting above the equator - we call that a masse'.

Dr Dave, Bob J, Fred A ... what's your take on this theory? Randy, Scott, Rod Elliot - what do you endorse? Students - if your instructors covered power draw, what did they say?

Control, finesse, and swerve avoidance dictate my level cue for less-radical shots, but for long power draw I jack up a little - because it works.

SpiderMan

Over years of playing, I too seemed to notice that, for long draw shots where the cueball and object ball are far apart, jacking up a little allowed me to get more draw without golfing the cueball into the air.

When my nerdy analytic mind first considered the "why" of this working, I thought that perhaps I was preserving my backspin by adding a little bit of "jump" to the shot and limiting contact with the cloth. But I discounted that theory because, even if you get as level as possible, you still get air time on a hard draw shot. Prove it to yourself by putting coins in front of the cueball.

<font color="red">My current position is that it's a matter of squirt and compensation, same as when using sidespin.</font color>

Consider what happens when you put right on the cueball - it's path "squirts" a little to the left. So, to make the shot, you also compensate by aiming a little to the right. This launches the spinning cueball straight along your original intended line-of-aim.

See where I'm going? Use right spin, cueball squirts left, so aim a little right to compensate. <font color="red"> USE BOTTOM SPIN, CUEBALL SQUIRTS UP, SO AIM A LITTLE DOWN TO COMPENSATE</font color>. The "launch trajectory" of the cueball may actually be closer to horizontal when aiming down, than when applying a similar amount of level-cue backspin.

<font color="red">Like it or not, we play pool in three dimensions. When you draw with a level cue, you "squirt" the cueball into the air. Use this in an all-out power-draw situation, without compensating your aim downward, and you may be playing on the floor.</font color>

Larry also notes that each player's "ideal" angle will be a little different. I suspect this is tied to the squirt characteristics of the cues. This would imply that players using low-squirt cues such as the predator 314 should need less jack-up than players using shafts with higher effective end mass. I wonder if anyone has made this observation?

Finally, to address the comments regarding hitting the cueball a little higher when you jack up - yes, this is true. But you still get the same amount of "retrograde" rotation, because this is totally a function of how far your cue's line of travel is offset from the cueball's center of mass. Think about it - if you jack up far enough, you can get lots of backspin even hitting above the equator - we call that a masse'.

Dr Dave, Bob J, Fred A ... what's your take on this theory? Randy, Scott, Rod Elliot - what do you endorse? Students - if your instructors covered power draw, what did they say?

Control, finesse, and swerve avoidance dictate my level cue for less-radical shots, but for long power draw I jack up a little - because it works.

SpiderMan