Frequently Asked Questions

General Frequently Asked Questions

In normal conditions Water Rokit will fly to approximately 30 metres (100 feet) – about the height of a 10 storey building!

The Water Rokit launches itself automatically, and this happens when the pressure builds up enough to release the inflationary tube which is around 25psi.

You must use a carbonated drinks bottle. Water Rokit is not suitable for any other type of bottle. The Water Rokit fins have been designed to work best with 1 litre or 1.5 litre carbonated drinks bottles. The maximum bottle size recommended is 2 litres.
The Water Rokit releases automatically at a pre-determined pressure which means it is suitable for carrying out the same experiments many times. It is also a visual teaching aid enabling pupils to see and understand science – it’s a fun way to teach Laws of Motion / trajectories and angles / measuring height and so on.
Any age group can enjoy the Water Rokit, but it is not a toy, younger children will need adult supervision. Young children may also find a tripod, stirrup or foot pump easier to use than a cycle pump as it requires far less effort and is easier to operate. There is no upper ‘age limit’ for the Water Rokit, though beware – it may unleash the inner child in every adult that launches a Water Rokit!

Yes. Looked after properly, your Water Rokit should provide many years of fun with countless take-offs. If the Water Rokit lands on a hard surface e.g. concrete then sometimes this may damage the carbonated drinks bottle, and you may need to replace it. Spares are available separately, like replacement pressure tubes, as well as the Rokit tail assembly parts if these get lost.

No. The Water Rokit is for outdoor use only. Under normal conditions, it flies to around 30 metres making it unsuitable and unsafe for indoor use.

No. Although the Water Rokit won’t fly very high without a propellant fuel such as water. Try it and see for yourself!

No. Fresh or recycled water is the only fluid to use in your Water Rokit.
No. Under normal use, Water Rokit automatically launches at around 25psi. Carbonated drinks bottles are designed to withstand much greater pressure, many times this level.

Pick up the bottle at arm’s length and slowly undo the white top, with care, as you would with a fizzy drinks bottle that has been shaken.

Frequent questions about buying from us

We deliver the Hinterland Water Rokit and accessories worldwide.

We aim to dispatch goods by post or courier on the day you place your order (Mondays to Fridays). During busy times it can take up to 2-4 days to dispatch your goods.

Water Rokit, and Water Rokit branded accessories carry a 12 (twelve) month guarantee against defects.  See our delivery terms and conditions for more details and for our returns policy. Generally we replace faulty parts free of charge. If you have a problem with our products then please contact us so we can rectify this.

Just contact us! Use our email at sales@waterrokit.com or complete our online form. We aim to respond to you within 24 hours.

Frequent questions about Usage & Assembly

The assembly is very simple – just follow the picture instructions below.

Water Rocket Assembly – Step 1
Water Rocket Assembly – Step 2
Water Rocket Assembly – Step 3
Water Rocket Assembly – Step 4
Water Rocket Assembly – Step 5
Water Rocket Assembly – Step 6
Water Rocket Assembly – Step 7
Water Rocket Assembly – Step 8
Water Rocket Assembly – Step 9
Water Rocket Assembly – Step 10
Water Rocket Assembly – Step 11
Water Rocket Assembly – Step 12

A large open space is recommended like a playing field. You should allow a radius of at least 40 metres (130 feet) around the Rokit launch area as on a windy day the Water Rokit will rarely land close to where it took off from. You must also ensure it is safe to launch the Water Rokit – you must not launch it in a densely populated area and you must never launch your Water Rokit near overhead power cables or similar obstructions. Be aware of nearby trees so as not to lose the Water Rokit on its descent. Be mindful of other people that may be in the area or within the Water Rokit landing zone area.

You may be using too much water in the Water Rokit. For optimum use we recommend to fill the carbonated drinks bottle to approximately ¼ (one quarter) with water. Over filling will make the Water Rokit too heavy for launch causing it to turn sideways. You should also check to make sure the Water Rokit is placed on a firm and flat surface pointing vertical when launching.  On a windy day the Water Rokit can be blown sideways. 
For optimum use we recommend to fill the carbonated drinks bottle to approximately ¼ (one quarter) with water. Over filling will make the Water Rokit too heavy for launch causing it to turn sideways. Under filling Water Rokit may mean its flight time is less, meaning less height is achieved.
Any good quality cycle barrel, track, stirrup, tripod or foot pump with universal connections will work. Cycle barrel pumps should be at least 15 inches in length. For ease of operation a track, tripod, stirrup or foot pump is more suitable as less effort is required to launch Water Rokit (for younger children especially).
Yes. It’s best to use some household rain water gutters, and adapt it as a launch system (this experiment is in the Water Rokit Experiments manual). Household gutter is a good material as the carbonated bottle fits comfortably onto this, reducing the friction upon take off.

Under normal operating conditions the Water Rokit will fly to around 30 metres. At around 25psi the black rubber nozzle is designed to expand allowing the brass plug on the yellow pressure tube to be automatically ejected. It is the amount of pressure build-up that ultimately determines the acceleration of your Water Rokit and thus the height of flight achieved. You must not modify the Water Rokit in any way to make it fly higher, as it has been designed to work safely at the pre-determined pressure settings. Modifying the Water Rokit could damage the product, and be dangerous to the operator and spectators when using the Water Rokit.

To protect the screw cap if the Water Rokit lands on a hard surface like concrete. Without the ‘o’ ring the shock wave may break the plastic screw collar. All plastic components are made using tough and flexible materials.
You need to assemble the fins correctly as per the instructions. Correctly assembled the fins should never fall off the Water Rokit during flight
You need to assemble the rubber nozzle as shown in the diagram on the instructions. It has a groove around its body which must clip into the plastic screw collar. Correctly assembled the rubber nozzle should never fall off the ​Water Rokit during flight.