Dan_ed,
Somewhere in this thread it's reported that in testing, Verus rim drive produced the greatest improvement in combination with the lightest Teres platter. It would seem that with rim drive (as with idler drive), high platter mass might actually impede speed stability (probably at the point where the motor has insufficient torque to meet the higher rotational force associated a high-mass platter.) But I suppose that high-mass platters are also better at resonance control. So there is likely a trade-off with how light one would want to go without resorting to fancy TT mats and other approaches to resonance control.
Since with rim drive as with idler-drive, speed stability is entirely determined by the motor, it would be interesting to know whether the 1800 RPM motor of the Lenco offers an inherent advantage. I assume that with the Verus, the drive pulley is pressed onto the spindle of a low speed motor. Perhaps the best rim-drive design would be a high-speed motor with multiple wheels and a step-down transmission. This might also improve isolation of motor noise.
Finally, issues of force and compliance surrounding stylus drag can't be too much different than issues regarding VTF. This is handled easily in a TT arm by counterweights & gravity.
Somewhere in this thread it's reported that in testing, Verus rim drive produced the greatest improvement in combination with the lightest Teres platter. It would seem that with rim drive (as with idler drive), high platter mass might actually impede speed stability (probably at the point where the motor has insufficient torque to meet the higher rotational force associated a high-mass platter.) But I suppose that high-mass platters are also better at resonance control. So there is likely a trade-off with how light one would want to go without resorting to fancy TT mats and other approaches to resonance control.
Since with rim drive as with idler-drive, speed stability is entirely determined by the motor, it would be interesting to know whether the 1800 RPM motor of the Lenco offers an inherent advantage. I assume that with the Verus, the drive pulley is pressed onto the spindle of a low speed motor. Perhaps the best rim-drive design would be a high-speed motor with multiple wheels and a step-down transmission. This might also improve isolation of motor noise.
Finally, issues of force and compliance surrounding stylus drag can't be too much different than issues regarding VTF. This is handled easily in a TT arm by counterweights & gravity.