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I'm going to join two 1.25 litre bottles together for a 80 psi water rocket. Is it ok?

I'm going to join two 1.25 litre bottles together for a 80 psi water rocket. Is it ok or should i make it more longer with a third bottle? what should be the ideal volume of the bottle for good efficiency at 80 psi?

rickharris5 years ago
There are lots of sites covering water rockets if you search google.

As a rule of thumb no matter what the volume of the bottle it should be 1/3 filled with water and the rest air.

A standard PET bottle will withstand 80 PSI easily IF your join between the 2 will!..


It's not always the case that making it bigger results in a higher flight there is a lot of drag/stability and weight problems with a bigger rocket.

Multi stage is a better option. Search.
caarntedd5 years ago
Check out all the instructables on water rockets in the right hand column of this page.