Raap

[Ralph Kramden]

Approaching the CB from behind the CB/OB line can help aiming, if you know corresponding OB shot angles from ball quarters.

If the cut is 15 degrees, start by using a CB offset of 1/4 ball toward the inside of the cut angle, and parallel to both ball centers.

I don't think RAAP should be called another 'aim' system. If RAAP is called a system, it should be considered a playing system.

RAAP is aimed at the reverse OB offset point, aligning the cue parallel to the balls. The contact point is found as the cue pivots.

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[Ralph Kramden]

Contact point on the OB, shift and pivot aiming. - 08-01-2012, 10:07 PM

This aiming method assumes one knows where the contact point on the equator of the OB that sends the OB to the pocket/target.
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1 With the bridge hand about 12” - 13” behind the CB, Look for the contact/impact poinit on the OB equator that sends the OB to the target/pocket. – the point where the line from the center of the pocket /target exits the OB (near you).

2 Aim the cue/shaft from the center of the CB on a line to that point.

3 Ignoring the CB for now, lateral/parallel shift the cue until it is now pointing at the center of the OB

4 Pivot from that new cue and bridge location back to the center of the CB – shoot.

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LAMas..... This is why RAAP angle aiming is different.

1 Number 1 is the same as yours... Find the Impact/contact point on the OB equator.

2 Aim the cue/shaft from the center of the CB down a line from center CB to Center OB. (all 3 are on the same line)

3 Lateral/parallel shift the cue to a CB offset that points to an equal distance spot on the OB, that is... Reversed from... the impact/contact point.
The cue is now parallel with both ball centers, shifted to the opposite side of CB center, pointed at a mirror image of the OB impact/contact point.

4 Pivot from that new Reverse Angle Aim Point (RAAP) location back to the original OB impact/contact point found in #1 - shoot.


Thanks for posting your diagrams, but there are a few differences... (See the diagram by pj... Post #19) Carl

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[Ralph Kramden]

It can be calculated for each shot - the pic below shows the geometry for that:

The CB Contact Point must contact the OB Contact Point, so the CB Path must be parallel with the line connecting the two Contact Points.

The two shaded triangles are identical, and show that (in order for the cue stick to point through the CB's center of mass) the cue stick's pivot length must be equal to half the distance between the balls minus about half the CB's diameter (minus ~1").

If you use a different pivot length, then the CB's path must still be parallel with the line connecting the Contact Points, but the cue stick won't point through the CB's center (i.e., you'll be adding some side spin and squirt/swerve).

pj
chgo

Maybe that's why Efren Reyes and Francisco Bustamante use long bridge lengths.
It would change their pivoting length (if that's what they are doing) on longer shots.

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[Ralph Kramden]

RAAP... Part 2

Part 1... For thicker cut shots.. Use Reverse ANGLE Aim Point
Part 2... For the thin cut shots.. Use Reversed ARC Aim Point... Just sayin'...

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[Ralph Kramden]

A pivot to center CB aligns both balls edge to edge. This is different from reverse angle aiming.

Instead of equal distance offsets, always aim the cue at CB center on a thin cut.

So how do you find a reversed arc? You first need to know the OB contact point.

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[Ralph Kramden]

A pivot to center CB aligns both balls edge to edge. This is different from reversed angle aiming.

Instead of equal distance offsets, always aim the cue at CB center on a thin cut.

So how do you find a reversed arc? You first need to know the OB contact point.

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When both ball edges overlap they'll form a football shape. This football shape is formed by two equal length arcs.
The CB always hits the OB contact point directly in the center of the 2 arcs, whether they're wider or are narrower.

The Reversed Arc is a determined distance that reverses from the OB center for a equal distance but reversed CB aim.
This distance is the same as from the OB edge to the CB contact point (or 1/2 football) and is reverse of the OB center.

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[Ralph Kramden]

When both ball edges overlap they'll form a football shape. This football shape is formed by two equal length arcs.
The CB always hits the OB contact point directly in the center of the 2 arcs, whether they're wider or are narrower.

The Reversed Arc is a determined distance that reverses from the OB center for a equal distance but reversed CB aim.
This distance is the same as from the OB edge to the CB contact point (or 1/2 football) and is reverse of the OB center.

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Only use the Reversed Arc Aim Point for shots that require too much pivot for Reverse Angle Aim Point pivoting.

I now want to thank LAMas again for his diagrams.. (post #16) .. The diagrams will help
to explain what I'm suggesting next in blue. A Reversed arc is aimed a very similar way.

LAMas steps 1- 4 in black...... Arc (football shape of 2 arcs) differences in blue

Step 1. Center of CB to contact point of OB
Arc ..... Center of CB to edge of OB (1/2 football shaped arc on the OB edge)

Step 2. Parallel shift to center of OB
Arc ..... Parallel shift to the center of OB. Then parallel shift 1/2 football .. a reversed arc shift. (1/2 of football shaped arc) See Note below.

Step 3. Pivot to center of CB
Arc ..... Same

Step 4. Shoot
Arc ..... Adjust your aim to the exact contact point.. Shoot

Note:
Everything above assumes you know the OB contact point and the distance from contact point, to the OB edge.
For the shift in number 2, you can parallel shift to OB center first, and look at the CB for a 1/2 arc reverse shift.
First aim center OB at the CB edge (side 1) of arc. Then shift the cue to opposite (side 2) of arc. Pivot center CB.

That's it. RAAP reverse angle aim point for thicker shots. Smaller pivot RAAP reversed arc aim point for thin cuts.

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[Ralph Kramden]

duplicate post as #26

 

[Ralph Kramden]

Only use the Reversed Arc Aim Point for shots that require too much pivot for Reverse Angle Aim Point pivoting.

I now want to thank LAMas again for his diagrams.. (post #16) .. The diagrams will help
to explain what I'm suggesting next in blue. A Reversed arc is aimed a very similar way.

LAMas steps 1- 4 in black...... Arc (football shape of 2 arcs) differences in blue

Step 1. Center of CB to contact point of OB
Arc ..... Center of CB to edge of OB (1/2 football shaped arc on the OB edge)

Step 2. Parallel shift to center of OB
Arc ..... Parallel shift to the center of OB. Then parallel shift 1/2 football .. a reversed arc shift. (1/2 of football shaped arc) See Note below.

Step 3. Pivot to center of CB
Arc ..... Same

Step 4. Shoot
Arc ..... Adjust your aim to the exact contact point.. Shoot

Note:
Everything above assumes you know the OB contact point and the distance from contact point, to the OB edge.
For the shift in number 2, you can parallel shift to OB center first, and look at the CB for a 1/2 arc reverse shift.
First aim center OB at the CB edge (side 1) of arc. Then shift the cue to opposite (side 2) of arc. Pivot center CB.

That's it. RAAP reverse angle aim point for thicker shots. Smaller pivot RAAP reversed arc aim point for thin cuts.

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At times (most times) after reading what I've written.. I can't understand exactly what I wrote.
After reading all of this garbage days later.. How can anyone actually decipher what I wrote?

RAAP Angle and Arc are different... The steps below help to understand the reversed Arc aim point.

1- Aim the CB center at the OB contact point.
2- Aim the CB center at the OB edge... remember the distance between the OB contact point and OB edge.
3- Parallel shift the cue from the OB edge to OB center... The cue shift won't be exactly parallel.
4- Aim the cue at the OB center from the CB edge... with the cue tip centered on CB edge.
5- Change the CB edge aim from the OB center... a reversed distance as from OB contact point to OB edge.
6- Remember the OB contact point distance found in #2?.. Aim the CB edge at a reversed OB contact point.
7- Pivot from the reversed contact point to center CB... adjust your aim and shoot.

The ball edges overlap, forming 2 arcs, or a football shape. The contact point is always
between those 2 arcs... The steps above explain how the reversed arc aim point works.
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I usually look from CB center, to find the Contact point distance from the OB edge (Arc).
I align the cue to both the CB edge and OB center with the tip centered on the CB edge.
I change the CB edge (Arc) aim, to a reversed aiming point from OB center. That offset
is the same distance as the OB Contact point to OB edge. I'll start pivoting to CB center.
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The RAAP angle and RAAP arc both work in a similar reversed way, but they are aimed differently.
Note: Arc requires pivots equal to distances between the balls. Angle is about 1/2 distance pivots.

Use the RAAP Angle offsets for most cut shots.. Post #19.... If the pivot is excessive you
can use the reverse Arc aim method above... or try the way LAMas explains it.. Post #16.

I like to play using the KISS method... or keep it simple stupid. This RAAP type of aiming is as close to kiss as any system.
It's a playing system that gives a definite point to start the pivot instead of guess work. The OB contact point must be found.


Damn.. I certainly do a lot of editing.. Carl
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[Ralph Kramden]

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RAAP isn't an aiming system.. You only "AIM" at a reversed contact point before you pivot. You need to find the shot line/contact point as you pivot.

RAAP Angle and RAAP Arc both work in similar ways, but the Angle pivots are different than the Arc pivots. The Angle pivot
points aren't as critical as the reversed Arc pivot point. Together, the reverse Angle and reversed Arc, are a playing system.
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RAAP Angle pivot points have more leeway, than an aiming system that pivots to center CB, reguiring a offset adjustment for spin. RAAP Angle CB
offset points can be used for inside side spin. If you need to go to center CB with RAAP Angle use 1/2 distance pivots.. See the diagram in Post #19.
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RAAP Arc pivot points are the same length as the distance between balls. Arc aiming points always pivot to center CB. There ls a reason I say Arc.
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The reason for saying Arc...
When the ball edges overlap there are.. 2 arcs.. forming a football shape. The contact points for both balls is always centered between these 2 arcs.
The CB slightly overlaps the OB on very thin cut shots.

If you know the distance from Contact point to OB edge (Arc 1) you can duplicate that same distance from the opposite Arc. When the CB edge aligns
with the OB center, shift the CB edge (Arc 2) to aim at the reversed OB contact point. (CB edge aimed to opposite side of OB center) When you pivot
to CB center from the reversed position, the CB will overlap the opposite side OB edge (Arc 1) and should form a correct football shape.. See Post #29.

When the cue aligns CB edge to OB center, it should center on the CB edge. The CB edge and reversed OB contact aim point may be less than 1/2 tip.

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[Ralph Kramden]

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RAAP isn't an aiming system.. You only "AIM" at a reversed contact point before you pivot. You need to find the shot line/contact point as you pivot.

RAAP Angle and RAAP Arc both work in similar ways, but the Angle pivots are different than the Arc pivots. The Angle pivot
points aren't as critical as the reversed Arc pivot point. Together, the reverse Angle and reversed Arc, are a playing system.
----------------------------------------------------------
RAAP Angle pivot points have more leeway, than an aiming system that pivots to center CB, reguiring a offset adjustment for spin. RAAP Angle CB
offset points can be used for inside side spin. If you need to go to center CB with RAAP Angle use 1/2 distance pivots.. See the diagram in Post #19.
----------------------------------------------------------
RAAP Arc pivot points are the same length as the distance between balls. Arc aiming points always pivot to center CB. There ls a reason I say Arc.
----------------------------------------------------------
The reason for saying Arc...
When the ball edges overlap there are.. 2 arcs.. forming a football shape. The contact points for both balls is always centered between these 2 arcs.
The CB slightly overlaps the OB on very thin cut shots.

If you know the distance from Contact point to OB edge (Arc 1) you can duplicate that same distance from the opposite Arc. When the CB edge aligns
with the OB center, shift the CB edge (Arc 2) to aim at the reversed OB contact point. (CB edge aimed to opposite side of OB center) When you pivot
to CB center from the reversed position, the CB will overlap the opposite side OB edge (Arc 1) and should form a correct football shape.. See Post #29.

When the cue aligns CB edge to OB center, it should center on the CB edge. The CB edge and reversed OB contact aim point may be less than 1/2 tip.

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Maybe RAAP should be on Dr Daves website... listed somewhere under his DAM aiming article.
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