rebound angle for positioning

[0rockhead]

Is this angle the same going in and comming out

[Rod]

Are you talking about the c/b? The angle could be the same but it doesn't have to be. Any top, low, or side english will change the angle a great deal.

Rod

[0rockhead]

yes the cue ball with no english. If the cue ball goes in at 45 degree will it come off one or two rails at 45.

[Rod]

It might depending on speed. It most likely will pick up some english so the 2nd and third rail angle will change on a running shot. The angles get longer after each rail

Rod

[0rockhead]

Longer meaning 40 to35 to 30 to 25 degress after each rail.

[Rod]

No, meaning 40 to 43 to 46 etc. It's just numbers nothing is actual. But the angle does change.

Rod

[heater451]

Doesn't the "actual" angle depend on the frame of reference?

In other words, if you measure the 45-deg entry angle from the rail, the exit angle will become smaller from the rail. But, if you consider the angle from a line perpendicular to the rail, the angle will increase, from the perpendicular line. [Note: I would guess that most people use the relationship to the rail, as in "go in on a 35-degree angle". For the 45, it could really be either.]

Myself, I usually think of the exit angle in relation to the imaginary perpendicular line, but considering the whole angle, created between the 'legs' of the cueball path. So, for any given entry angle, I consider it's effect on the 'whole angle'--it either becomes "wider" or "narrower". Alternatively, I will sometimes think in terms of "long" or "short", in relation to the desired endpoint of the cueball path(s).




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[Fred Agnir]

<blockquote><font class="small">Quote 0rockhead:</font><hr> Is this angle the same going in and comming out <hr /></blockquote>Almost never.

Fred

[Fred Agnir]

<blockquote><font class="small">Quote 0rockhead:</font><hr> yes the cue ball with no english. If the cue ball goes in at 45 degree will it come off one or two rails at 45. <hr /></blockquote>This is backwards. With no spin, the cueball will always rebound shorter.

Fred

[Rod]

Allen,

I just look at is I'm going into the rail at whatever angle. The angle leaving the rail depends on where I want the c/b to travel. If I need to shorten up the angle then low with side if necessary. If I want it to come out longer then top or side as needed.

Rod