FireSmith Double Voice Firecracker - Build Your Own Fireworks - Made in USA!

Double Voice crackers are quick and simple devices to construct, but are immensely entertaining. The device is essentially a self contained aerial salute. The black powder lift charge is contained in the bottom cavity of the tube while a burst or salute charge is contained in the top cavity of the tube. The clay plug separates these two compartments and encapsulates a length of visco fuse that acts a both a passfire and a time delay. Upon ignition, the black powder sends the device airborne while simultaneously igniting the fuse contained in the clay plug. When the fuse burns through to the top compartment the burst charge is ignited, delivering a nice report. Completely CAD/CAM designed and CNC machined. Be sure to check out the construction guide in the tutorials section of the website.