Although the requirements for computer time and disk storage are still large, they are orders of magnitude less than what would be required by numerical solution with the differential formulation, so that some time-dependent, three-dimensional solutions can at least be considered within the present state of computer development. The accurate prediction of body forces at high Reynolds numbers would require unfeasible amounts of computer time and storage with a rectangular constant-mesh coordinate system and is still beyond the present development of the technique. Further work would be desirable to extend the present technique to nonrectangular, and eventually general, nonuniform curvilinear coordinate systems, so that bodies of general shape can be more efficiently treated.