Design Problem: Pressure Rocket + Bike Pump

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The discussion centers on designing a pressure rocket using a 2-liter Coke bottle, water, and a bike pump. The creator faces a challenge with the rubber stopper, which dislodges at around 1.5 atm pressure. Suggestions are sought for a reliable release mechanism to safely manage pressure without losing the stopper. A link to a relevant resource is provided for additional guidance. Effective solutions could enhance the rocket's performance and safety.
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im working on a simple pressure rocket for fun, and am running into a problem. my basic design is using a 2 liter coke bottle partially filled with water and pressurizing it by using a rubber stopper with a tire valve in it and pumping it with a bike pump. The problem is that i can only get about 1.5 atm in the bottle before the stopper flys off. if someone could suggest a way to make a release mechanism I would be very appreciative.
 
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