The Achernar subclass/class is something found in the expanded universe of Star Trek. It evolved out of the attempt to explain a kagillion Constitution classes in existence outside "Only 12 like it"; I'm not sure about anything prior to the Technical Manual, but said publication explained it by have the Constitution class really be the prefit/Pike era ship, and the TOS refit being the Bonhomme Richards subclass; Franz Joseph invented the concept of subclasses. So therefore you could cheat and say there were 12 Constitution class ships, but multiple more that were of the new design subclass and were never refit. The Achernar class presents a problem because there seems to be absolutely no reason for it to even have been created. I can't find anything extensive about it anywhere, so it's not anything special. It doesn't seem to have been any fan or writer's pet project or anything. And all it looks like is an incorrectly drawn Constitution class taken too far as a concept. It seems like a vestigial organ. Or maybe it never had any purpose. So could anyone chime in on this? On the whole, what this was supposed to be and why it exists confuses me.