"Once all demands are identified the design will determine itself...it is the approach of an engineer."
Dertonarm, I don't think so. If it does then you should name your tonearm Athena-- born directly from the forehead of Zeus. Since an LP is far removed from a virgin uncut master and tracking is diametric from cutting, there is really little more than force of analogy to suggest that the engineering process will be self-determined by a complete understanding of the physics embedded in an LP. I see the engineering process in this instance more as a series of differential equations that are fitted to a problem and tested at boundary conditions. The solution is revealed through an iterative process.
The diversity that we see among tonearm designs stems largely from each designer's particular assumption about which variables are key determinants. An illustration is captured in the recent thread on 12" tonearms, in which a Bob Graham citation suggests that there is a necessary trade-off between the tracing advantage of a long arm and the disadvantage of increased wand resonance and mass. IIRC Graham conceded that the 12" Phantom option was driven mostly by market considerations. If your "blue book" can build a pivot arm without any such compromises then I will be at RMAF 2011 to celebrate.
Dertonarm, I don't think so. If it does then you should name your tonearm Athena-- born directly from the forehead of Zeus. Since an LP is far removed from a virgin uncut master and tracking is diametric from cutting, there is really little more than force of analogy to suggest that the engineering process will be self-determined by a complete understanding of the physics embedded in an LP. I see the engineering process in this instance more as a series of differential equations that are fitted to a problem and tested at boundary conditions. The solution is revealed through an iterative process.
The diversity that we see among tonearm designs stems largely from each designer's particular assumption about which variables are key determinants. An illustration is captured in the recent thread on 12" tonearms, in which a Bob Graham citation suggests that there is a necessary trade-off between the tracing advantage of a long arm and the disadvantage of increased wand resonance and mass. IIRC Graham conceded that the 12" Phantom option was driven mostly by market considerations. If your "blue book" can build a pivot arm without any such compromises then I will be at RMAF 2011 to celebrate.