Scratchbuilt two-stager with two 18mm motors per stage. Four 18mm motors in 2x2 configuration. I devised the split booster stage to guard against non-simultaneous upper stage ignitions. BT-60, 41”, 4.5 oz. Flew it for the first time on 5/26 with 2 B6-0's in the booster stages and 2 A6-4's in the sustainers. It was quite a show. Close scrutiny of the videos and photos shows the upper stage motors ignited about .5 sec. apart. Looks like the split booster staging was the right idea.