Which craft do I model: Apollo 8, 9, 11, 13, or 15? Not so trivial a decision, if I really want to have a reasonably accurate model. The S-IC stages had retro rockets. All of these missions used 8, except for Apollo 15, which used only 4. Some of the S-II stages used ullage rockets: […]

4TNC turned out pretty well! A B4-2 had the right delay, but not quite enough thrust. The flight seemed to be, well, mushing (in the sense that an airplane can be mushing: descending on the back side of the power curve, not stalled, but not exactly flying well) for about 10m after clearing the launch […]