![]() To combine the bottle sections, you have to shrink them on one side. It is very important to ensure an even cutting edge. You can also use a jig consisting of a drilling machine and a cutter. When cutting off the sections, it is useful to mark the areas with a pen and a piece of paper. Cut off both the lower and the upper sections from the bottles, but leave two bottles out and remove only the lower section from them but not the neck. But first of all, you have to prepare the bottles. However, the method of construction and the number of joints can be adjusted to your liking. We are going to build a pressure vessel with six joints. You can also put together multiple pressure vessels by using specific connectors. The most popular one is to cut off some parts and glue them together with polyurethane based adhesive. In this tutorial, we are using bottles from „Apollinaris“, but these bottles are maybe not available to you, depending on your location.There are many ways to combine the bottle sections. The bottles should be as strong as possible and should have a long cylindrical section. However, not all plastic bottles can be used for water rocketry. Regardless which method of construction you go for, the principle of building the pressure vessel is always the same: Multiple plastic bottle sections are combined together. We also recommend using only three instead of four fins on every rocket to save even more weight. The typical shapes already used by many water rocketeers usually work quite well. The fins of the rocket shouldn’t be too large, because that usually results in uncontrollable flight behavior. Of course, they should be as light as possible, so choose a material which is very light but durable at the same time - like Corflute, for example. The fins are essential to ensure a stable flight of the rocket. The two-segment-vessel is a bit larger and heavier than a single vessel but it allows the use of radial parachute systems. This helps to optimize the center of gravity of the rocket, which results in better flight characteristics. Two pressure vessel segments: The pressure vessel consists of two, differently sized segments, which are joined with a small adapter. Because there are no hollow spaces the chamber is very small and light The parachute system sits on top and ejects the parachute sideways or upwards.
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