2R1: The size of the pocket must be as
small as possible to make the bearing less sensitive to
instability. The minimal value of R1 is limited by Ac.
h0: A high axial bearing stiffness,
self-aligning capability and the minimal flow is obtained
with small fly height. The minimal value of the fly height gap is limited by bearing deflections and flatness of the
bearing surface and is usually related to the bearing size.
Permeability: This material
constant determines the thickness of the porous surface
required to get the right pressure drop from pS to pR. The
permeability can be reduced by impregnating the porous