Hi,
meanwhile I found some documents from Ron Shepard, Dr. Dave and Bob Meucci. Ron Shepard maybe was the one who "created" the term of the "effective endmass" and Dr. Dave used it many times.
In one of his articles Dr. Dave wrote that the so called "endmass" or "effective endmass" shall be understood as a function of geometry and material properties. And in another article Dr. Dave says clearly that mass AND also shaft stiffness is important for squirt. But this expert of theory leaves a big miracle open about deflection or squirt affecting aspects by defining this "function" of an endmass.
Ron Shepard writes in his theory about endmass, that it is in principle the shaftend's performance of moving sidewards while contacting the white ball that decides about much or less squirt. This goes in principle hand in hand with Bob Meuccis theory, that flexibility is very important, just packed in other words and terms. But both very mystic / abstract. But how explaining it not so abstractly?????
In my understanding everthing these 3 experts tell sounds logically and explains "reality" of billards. For example the predator shafts, especially the Z2, unifies maybe all principles affecting low squirt:
- very small diameter at the end --> low mass, high flexibility
- boring in the front end --> low mass, high flexibility
- soft material of ferrule --> high flexibility
- small ferrule with low density--> low mass
- medium tip hardness --> higher flexibility
As I see now it is very easy to be missunderstood if one only talks about "endmass", many people then only think about weight, but do not see that the creators of that idea also included stiffness or flexibility, call it as you want.
Beside having the clearness about theories' principles, it is maybe impossible to quantify each single aspect in relation to the other aspects.
But it seems to be a very interesting thing investigating the influence of flexibility and stiffness (in area tip and ferrule / the whole shaft) in a similar way Ron Shepard and Dr. Dave did for the endmass.
Does anybody know about such investigations?
best regards
Michael
meanwhile I found some documents from Ron Shepard, Dr. Dave and Bob Meucci. Ron Shepard maybe was the one who "created" the term of the "effective endmass" and Dr. Dave used it many times.
In one of his articles Dr. Dave wrote that the so called "endmass" or "effective endmass" shall be understood as a function of geometry and material properties. And in another article Dr. Dave says clearly that mass AND also shaft stiffness is important for squirt. But this expert of theory leaves a big miracle open about deflection or squirt affecting aspects by defining this "function" of an endmass.
Ron Shepard writes in his theory about endmass, that it is in principle the shaftend's performance of moving sidewards while contacting the white ball that decides about much or less squirt. This goes in principle hand in hand with Bob Meuccis theory, that flexibility is very important, just packed in other words and terms. But both very mystic / abstract. But how explaining it not so abstractly?????
In my understanding everthing these 3 experts tell sounds logically and explains "reality" of billards. For example the predator shafts, especially the Z2, unifies maybe all principles affecting low squirt:
- very small diameter at the end --> low mass, high flexibility
- boring in the front end --> low mass, high flexibility
- soft material of ferrule --> high flexibility
- small ferrule with low density--> low mass
- medium tip hardness --> higher flexibility
As I see now it is very easy to be missunderstood if one only talks about "endmass", many people then only think about weight, but do not see that the creators of that idea also included stiffness or flexibility, call it as you want.
Beside having the clearness about theories' principles, it is maybe impossible to quantify each single aspect in relation to the other aspects.
But it seems to be a very interesting thing investigating the influence of flexibility and stiffness (in area tip and ferrule / the whole shaft) in a similar way Ron Shepard and Dr. Dave did for the endmass.
Does anybody know about such investigations?
best regards
Michael
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