I just went out and bought a couple packs out the ESTES Black Powder motors. I bought one pack of the E9-4's and one pack of the E12-4's. I was up in the air as what delay to get on the E12's since I don't have the information in ROCKSIM so I went with the same delay as the other pack of motors since those worked well when I sim'ed them in ROCKSIM.
I just completed my Big Daddy and 2.6 diameter scratch build. I'm looking forward to launching in the next week or two. I also ordered a couple new neon Topflight chutes (Yellow and Pink)
Has anyone used the E12's and how close is the delay to the E9's?