After our tests we can confirm that the only inconsistency lies within the time-fuse built into the shell itself. That is out of our control. What IS in our control is the pace at which the shells leave the mortar rack tubes. We started with the 10 second a ft fuse then the 3 second a ft fuse. Then, we tested the 0.03–1.25 second a ft quick fuse and finally the 0.01-0.03 second super quick hobby fuse. I think our favorite pace was definitely the 1.25 second quick fuse since the shells exited the tube at the same pace as a 1/1 cake would fire. Hope this helps and hope you all enjoyed!