Does the amount of deflection on a LD Shaft depend on which side is up?

[dr_dave]

Noone so far has tested deflection based on the orientation of the spine of a maple shaft which is supposedly what the red dot denoted... I doubt that the players of old who knew how to mark the spine didn't have a reason even if noone understands why.

Per my previous post, I HAVE done a careful experiment to test for this using a marked Meucci flat-laminate shaft (which should have even more of a "spine" than a non-laminated shaft). Again, I saw no difference in squirt (CB deflection) with different cue orientations. For the detailed results, see Diagram 3 in "Squirt - Part VII: cue test machine results" (BD, February, 2008).

Again, for more info concerning why spine orientation should have very little or no effect on squirt (CB deflection), see:
what causes squirt?
endmass and stiffness

The "hit" and "feel" of a shaft might vary with orientation, but both experiments and theory agree that stiffness differences with orientation should have no practical effect on CB deflection (squirt).

Regards,
Dave

 

[Patrick Johnson]

PJ is still a parrot...

Yep, almost everything I know I've learned from others, starting with walking and talking. I think that's true of everybody, even (gasp) you - maybe you haven't learned that yet.

If you're not a parrot you haven't learned much.

pj
chgo

 

[The Renfro]

Per my previous post, I HAVE done a careful experiment to test for this using a marked Meucci flat-laminate shaft (which should have even more of a "spine" than a non-laminated shaft). Again, I saw no difference in squirt (CB deflection) with different cue orientations. For the detailed results, see Diagram 3 in "Squirt - Part VII: cue test machine results" (BD, February, 2008).

Again, for more info concerning why spine orientation should have very little or no effect on squirt (CB deflection), see:
what causes squirt?
endmass and stiffness

The "hit" and "feel" of a shaft might vary with orientation, but both experiments and theory agree that stiffness differences with orientation should have no practical effect on CB deflection (squirt).

Regards,
Dave

Black Dot Flat Laminate. Which were tested to be as radially consistent as the pie shaped and other orientation laminates .. Maple with the spine marked COULD have considerably more radially inconsistency... Which might just be what makes the difference...

IF a shaft wants to bend one way vs the other wouldn't it kind of be likely that in that direction the deflection properties might differ from when in opposition?

The test I would say is valid for laminates but I am not buying in on being able to apply it to non laminates. If the hit and feel will vary based on spine maybe there is more to it.....

 

[dr_dave]

Black Dot Flat Laminate. Which were tested to be as radially consistent as the pie shaped and other orientation laminates .. Maple with the spine marked COULD have considerably more radially inconsistency... Which might just be what makes the difference...

I thought the whole purpose for the flat laminate was to create a very well-defined spine with much greater stiffness in one direction than the other. That's why the shaft was marked ... right?

IF a shaft wants to bend one way vs the other wouldn't it kind of be likely that in that direction the deflection properties might differ from when in opposition?

I know that might sounds reasonable ... I once thought that also. But it turns out that stiffness can have only a slight indirect effect on CB deflection (squirt). It is the endmass (not stiffness) of the shaft that creates CB deflection. For more info and proof, see:
what causes squirt?
endmass and stiffness

If the hit and feel will vary based on spine maybe there is more to it.....

Shaft stiffness can definitely affect the "hit" and "feel" of the shaft.

Regards,
Dave

 

[The Renfro]

From Meucci's website... I'd argue them being the lowest deflection haft by far these days but the dot marks a <2% stiffness difference which could be considered the spine.....

"The new Meucci Black Dot Bullseye Flat-Laminated Performance Cue Shaft is made from, not 6, not 8, not 10 or 12 separate pieces, but 35 flat Northern Hard Rock Maple laminations, the same as a tree normally grows. Radial Consistency of this shaft is equal to Natural Hard Maple or any of the pie laminated shafts presently on the market. The less than 2% spine differential of this shaft is marked with our Black Dot Bullseye for those of you who can detect slight nuances and play to this extremely high level."

I would say if there is truly less than 2% difference there would be zero impact on deflection, feel or hit....... Which I would expect from any of the engineered shafts....