bottle rocket fins and venturi

thingiverse

Using a soda bottle rocket guide (http://www.instructables.com/id/Soda-Bottle-Rocket/), I experimented with enhancing thrust through a venturi nozzle design. The nozzle should attach to the bottle securely, like a cap. As for the construction, follow basic instructions from the link while epoxying the launcher into 1-inch PVC or ABS pipe. A 1/8 wire (a coathanger works too) serves as the launch trigger, and you might need silicone at the bottom of the launcher for a tight seal.