User blog comment:Kitahara/Recording drum expedition success rates/@comment-109.188.127.12-20150406000422

Author of Expeditions.png here. That test was done right after devs added drums in February, ever since then they changed mechanics a bit, min drums no longer give 50%. only 5, 7 and 13 respectively should still give 50%. And it's a constant value, more drums don't change it. Sparkles still give the same 16% per ship.

Regarding "failed" expeditions, normal expeditions with 6 sparkled ships fail to get GS pretty often. I always run all expeditions that's longer than 30 minutes fully sparkled and get 20~30 normal sucesses per month despite always keeping ships above 60 morale. Ex6 is especially guilty of this. Then again, I run it for 16-19 hours every single day so the odds tend to stack up. Anyway, the cap might be something around 99,75%. The same cap applies to rat transports for sure.