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Tools for the air pressure chamber:
Materials for the air pressure chamber:
Electric Trigger mechanism (buy these parts and wire a simple circuit to power the sprinkler valve, or purcahse the pre-fabricated assembly from the link below)
For the base:
The total cost is about $70, excluding all tools and solvent weld. In my line of work, it is well worth the initial investment because the paper rocket activity is very cheap, less than $0.15 per student.
For paper rockets: