i'm kinda scratching my head right now.. i was doing some simulator testing of a carrier flagship in my current campaign, and felt that, while replacement rate sits all the way down at 30%, fighters took a lot longer to replace than they should -- even with that low rate in mind.
so i did some testing. this was done in my vanilla 0.8.1a-RC8 install, zero mods enabled. i tested with a Heron, in simulator from mission refit screen.
while at 30% replacement rate, a single Broadsword took ~105 seconds (+/- 3 seconds or so) to replace. as in, from the moment that the 1st Broadsword launched after its entire wing had been wiped out, until the time the 2nd Broadsword was launched. base replacement time of a Broadsword is 10 seconds...
the other two wings were Gladius and Khopesh, which both share 10 seconds base replacement rate, also both destroyed. i didn't measure their timings, but they seemed to at least roughly line up with the Broadwords'. i tested both having set fighters to Engage for the full duration, and having them set to Regroup, didn't make a difference. i also tested the same setup with 95-100% replacement rate, and the time it took for one Broadsword to be replaced was the expected ~10 seconds there.
so it looks like fighter replacement time actually goes down to 10%, even though it's displayed as sitting at 30%. o.o
the reason i'm scratching my head is that this seems like a pretty major bug -- if it really is a bug and i'm not just missing something here ^^ -- and i'm having a hard time believing nobody noticed until now, if it isn't something that only happens under rather specific circumstances. i did a quick search here for other threads that might have reported this, but didn't find anything.