PDA

View Full Version : rebound angle for positioning

02-26-2004, 12:12 PM
Is this angle the same going in and comming out

Rod
02-26-2004, 12:18 PM
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

02-26-2004, 12:23 PM
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
02-26-2004, 12:44 PM
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

02-26-2004, 12:57 PM
Longer meaning 40 to35 to 30 to 25 degress after each rail.

Rod
02-26-2004, 01:11 PM
No, meaning 40 to 43 to 46 etc. It's just numbers nothing is actual. But the angle does change.

Rod

heater451
02-26-2004, 04:49 PM
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).

==============================

Fred Agnir
02-27-2004, 09:06 AM
<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
02-27-2004, 09:08 AM
<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
02-27-2004, 03:42 PM
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