Double-voice crackers (DVCs) are effectively a mortar shot without a mortar tube. You can pump these out really fast, and have aerial effects in no time! In this article, we are going to use flying fish fuse for the fuse you light, the internal time-delay fuse, and the burst effect “stars”. Bring your best black powder to this project! These little crackers work best with HOT and FAST black powder. Low-grade BP makes for sluggish performance, and only sends the payload up a couple tens of feet into the air. For this example, we are using GOEX FFF black powder....