I would expect the different shafts to create different amounts of squirt (cue ball deflection), but maybe you are compensating for that in your aim.I am having hard time agreeing with above i marked in red, i have, 9, 10, 11, 12, and 13 mm tip shafts, i used all for thin cuts and 1/2 ball cuts using rolling inside english medium speed, clean balls, 100% level shaft my finding with the 9 mm, 10, and 11 mm shaft i have no throw, when i slowed the speed i started seeing the throw (under cut). When using 12 and 13 mm tips i started seeing more cue deflection and noticeable over cutting of the ob an indication of cue deflection.... inside english does increase the amount of object-ball throw with small cut-angle shots and decrease the amount of throw with larger cut-angle shots.
Similarly with outside english same results
But when i stun or slow role i do see much increase in throw.
I know my stroke is 100% straight, i shoot straight shots all the time and right on the money, i use laser beem to judge my stroke..
My 2 cents.
The only way to get a "100% level shaft" is if the butt is not over a rail.
At slower speed, the swerve happens sooner which will cause a thicker hit. Throw will also be more at slower speed.
I'm sorry you don't agree with my statement in red, but it is true. However, it is difficult to do experiments to verify this because squirt and swerve are also factors with shots at a table. In comparing the amounts of throw of different shots, you need to make sure the CB is arriving at the OB in the exact same ghost-ball position for each shot (i.e., you need to adjust perfectly for squirt and swerve effects as shot speed and spin change). If you could do this, you would see how the amount of throw changes with different types of shots.
FYI, the experiments demonstrated in the following video illustrate many of the throw speed and spin effects:
Check it out if you haven't watched the entire video yet. It clearly shows many throw effects not are not intuitively obvious to most people.
Also, the following document contains lots of graphs that show how throw changes with speed, cut angle, amount of top/bottom spin, and amount of English (assuming squirt and swerve are compensated for perfectly):
Check it out.
Regards,
Dave