If, unlike Darvin and Alex, you don’t happen to recall the near-disastrous systems failure with lots of explosions, you can read the story of the Pathfinder’s Jump.

Actually, it was in this same short story where Zan hints at the reason why the Nelson Project (AKA the Jump Engine Project) was moved from Interplanetary Patrol vessels to the Galaxion (which is what Darvin is referring to here). I may have also brought this factoid up somewhere else in the comic, but right now I can’t find it! Do let me know if you remember reading something like that. :-)