Linear tracking air bearing arms are odd creatures, and while the mass calculations for resonance is still the same, it acts differently. This arm is similar in execution to the Eminent Technology style arm, with a somewhat stubby arm wand. Other types of these arms use just a carrier assembly, like the Souther, and mass is set by head shell weights. Or the Terminator arm that uses Ladegaard design, and has the most mass in the horizontal plane. And that is one of the design considerations of a non motor driven linear tracking arm, how is the mass distributed? Most of these designs have more mass in the horizontal plane when compared to the vertical. So for one direction it acts as a high mass arm, and in the other its effectively a low mass one.
Then the question of bearing stiffness, and how much air needs to be applied to achieve an optimum bearing is bandied about. Couple this with micro ripples in the air flow, and whether a surge tank should be used or not. In theory this is as important as conventional arm resonance considerations in a pivoted tone arm. And these points got enthusiastic discussion back in the glory days of these types of arms.
But as far as mass and compliance equations. Well its simple enough to remove the short arm and weigh it. The standard calculations will work for it, and I suspect it will come out being compatible with medium compliance cartridges.
Regards
Misterig