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WATER-AIR Pressure Bottle ROCKETS anyone?

HI all!
As the title says, anyone into Water bottle rockets?

I`ve made a couple out of those coke litro bottles and used my bicycle pump. I`ve pressurized up until about 110 PSI.

I havent made a nose cone or fins yet, so height and stability are expectedly sacrificed, but still lots of fun! :D

Me and my family will be doing our annual vacation to ilocos sur where there`s lots of open space for flying em!

Maybe we can share ideas as far as LOCALLY available materials and techniques?
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