Runs of angular momentum and radius for three BH orbits: circular; an elliptical orbit with a small eccentricity, e ≈ 0.55; and a third case with a large eccentricity, e ≈ 0.67. a) Run of the angular momentum for each case as indicated in the legend. The solid black curve graphs L_z for the circular initial orbit displayed on Fig. 12. b) Cylindrical radius as a function of time for the same three cases. We note how the BH orbit with the more elliptical orbit actually evolves at a near-constant mean radius.