Developing the most advanced waterrocket.

Poseidon_Logo4C1_tagline
Electronically controlled waterrocket with Thrust Vectoring, Guidance/Navigation and many more features.

For a general overview, please check out the timeline down below.

To read more about our current engineering efforts visit the Development Blog.

If you are interested in in-depth videos about the project give our TCR Studio page and our Youtube channel a try!

fixed airframe rocket

Pathfinder 1/2

in use: testing

gimbaled airframe poseidon

Pathfinder 2/2

development

first flying vehicle

Waterrocket 1

concept phase

Poseidon Tanks: Concept and Design

FAR so far The FAR test platform has tanks made out of PVC. We chose this material because it's quick and easy to build a tank out of, and can sustain a pressure of about 8 bar. Additionally, it is relatively cheap and available. However, these PVC tanks are not flight ready. They weigh almost ten times the flyable weight and cannot sustain the required pressure of about 28 bar. Requirements for the Poseidon tanks Weight The rocket must be light, preferably under 1500g. Our simulations have shown that the rocket at 28bar can lift around 7kg. Leaving some room ...

Thrust and Valve Fundamentals

Hey there! Right now, we are in the beginning of development and have to test the basic concepts first, so take this following stuff with a grain of salt. As for the mechanics, this means things like tank and valve fundamentals. Because we want to have the capability to control the thrust of the rocket, we need a solenoid valve (a controlled magnetic valve) controlled by a microcontroller. Now, the question is how the tank-valve-etc layout should look like. The basic idea of a water rocket is one big tank, with circa one third of the volume being water and ...

FAR Software: Telemetry, LoadCells and more

Hey everyone, it took us a long time to get started, but finally after Finn and I wrote our last exam for this semester, we finalized the partslist and got to work. As a short recap: The first step in Project Poseidon is FAR - the Fixed Airframe Rocket. Contrary to what the name suggests, it is actually a teststand and will hopefully never leave the ground. With this pathfinder we want to collect data on the thrustcurve and massflow of a waterrocket. This will help us to evaluate which drymass is feasible and based on that if the Poseidon-Rocket ...

Timeline

In the beginning we have to figure out if our target is realistic.
Shouldn't that be the case we need to define a new one. Because the math behind waterrockets is quite complicated, we decided to build the pathfinder test-vehicle FAR (fixed airframe rocket).
As the name suggests, it is fixed to the ground, so not quite a rocket yet. But it is basically an early prototype of the planned Poseidon-Rocket, which is held down by load cells.
This enables us to measure the thrust curve and change in mass over time. With that data we should be able to build a mathematic model and decide whether our goals are feasible or not.

The next logical step after that is the devolpment of a vehicle which verifies our general design of the Poseidon rocket while still being mounted to the ground.
For that purpose we will build the Gimbaled Airframe Poseidon (GAP).
In contrast to FAR, GAP is mounted in a gimbal suspension and will be able to rotate freely around three axes.
We will use this pathfinder vehicle to test our TVC-Mount (Thrust Vectoring Control) and the stability-software which should keep the rocket upright.
We decided to implement this additional phase into the timeline to mature our hard- and software before our first flight attempt.

With the knowledge from FAR and GAP we will develop the Poseidon rocket.
It will feature one thing that GAP lacked: A recovery system. This will be a parachute which serves as an abort throughout the flight as well.
After some ground test of the rocket with focus on the brandnew systems like recovery, Poseidon will be ready for the first flight.

We don't expect the first flight to be a successful one, but we hope that we won't break too much hardware, because we tested the key systems early and intensive.

We don't want to talk about our future plans too much right now, because the way to the first successful flight of Poseidon will be a long and bumpy one. Just one thing to think about: The valve which controls if water exits the rocket or not can be opened and closed during the flight multiple times. This could enable us to perform multiple burns. Random examples for that are a deceleration-burn or a landing burn. But of course these were chosen totally arbitrarily!

Project Poseidon on Youtube