Trouble Shooting & Further Study:
If you don't use enough foil, the gas can escape through the head of the rocket instead of the nozzle. Likewise, if your nozzle is too wide, it won't produce enough force to propel the rocket upward.
If you use too much foil, it will make your rocket too heavy to fly.
How far did your first rocket fly? Can you think of ways to improve the paper match rocket design to make it fly farther? What about the launch pad? Could you tweak its design to launch your rocket higher? What about farther?