Sliding or Flipping
SFx = FfL + 0 = m v2/r, or FfL = m v2/r
SFy = FcL + 0 - mg = 0, or FcL = mg
St = -FfL*h - 0*h + FcL*(w/2) - 0*(w/2) + mg*0 = 0, or -FfL*h + FcL*(w/2) = 0.
If friction is maximum (limit for sliding) we have: FfL = m v2/r with Ff = mFc = mmg, so mmg = m v2/r, or vmax = [mgr]1/2 .
If flipping is to be prevented we have FfL = mv2/r, FcL=mg, or mv2/r * h = mg*(w/2), or vmax = [grw/2h]1/2 .