Altimeters like this model from Perfectflite are used in some WRA2 competitions.

The Water Rocket Single Stage Altitude Record. Eligible competitors fly class legal single stage water/air powered rockets to compete for the world altitude record. Formerly called "Class A" World record rules.

The Water Rocket Multiple Stage Altitude Record. Eligible competitors fly class legal multiple stage water/air powered rockets to compete for the world altitude record. Formerly called "Class B" World record rules.

The Water Rocket Flight Duration Record. Eligible competitors fly class legal single stage water/air powered rockets to compete for the world's longest flight. Formerly called "Class C" World record rules.

WRA2 Competitors can reinforce their bottles using various nonmetallic materials.

The WRA2 Altitude Challenge. Eligible competitors fly class legal  water/air powered rockets to compete in the WRA2 altitude challenge. Pressureswill be limited to enable competition without the high cost of exotic materials.

The Water Rocket Dragster World Record Competition. Eligible competitors launch class legal water/air powered vehicles to compete for speed and distance records.

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