Probably the best is to do a search on the web for the various designs. The classical Cass. design is a parabolic primary and a hyperbolic secondary. The R-C design is two hyperbolic surfaces.
If you're planning on doing a design, you may want to pickup the R and V book Telescope Optics from Willman-Bell and maybe also the software so that you can do a design properly. Total cost is $50 Plus shipping for the book and software.