Water Rocket Safety Guide
By no means claiming to be complete but possibly including some things that are not so abvious to the beginner.

Safety First

NevWise Owl says 'Take note of these points'.er:
Never use a breakable container as the rocket - DO NOT USE GLASS;
Never take the rocket to a pressure greater than that at which it has been tested;
Never aim it at anybody;
Never aim it anywhere at anything that you cannot see such as around a corner or out to sea;
Never aim it into or across a road or in the path of a vehicle;
Never launch near any buildings or cars or anything else that can be damaged;
Never launch near any power lines or anything else that can damage you or anyone else;
Never use a bottle that is damaged such that it may fail when pressurised;
Never use a gas that will react with any of the parts of the launcher;
Never use a reaction mass that is likely to harm anybody - keep to water; and,
Never launch in high winds - Completely still is best.
Always be careful with compressed gas (remember that a bicycle pump can deliver 6 BarG);
Always make sure that the reaction mass inside is still - waves or circular motion can lead to unpredictability;
Always make sure that the people around the launch have a good idea of what to expect; and,
Always consider where the air that you are launching into will be when your rocket lands - if you are going for duration and anticipate a 30 second flight time, the air that you are launching into may have moved off-site during that time. Consider using a smaller chute in this case if doing so is reasonable.

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