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21. June 2019 – Munich, Germany




The CDR week is over and before we take a little project break for the exam time, we want to let you in on the news of the week, of course.

The design review was successful! Our mechanical design is pretty much done and can be finished in July. Of course, there is always something to improve, ambiguities and gaps in the documentation and suggestions for improvement in project management were addressed. All this will be improved in the next few weeks in our SED.
Even in the electrics we are, albeit scarcely, on schedule and are progressing well. Most of the parts have been ordered and can be assembled in the next few weeks. The software of our experiment, however, is our biggest weakness.
The program must control the motor and LEDs, read out the sensors and cameras, and ensure communication with the ground station. And all this autonomously, without intervention. At the moment, we are looking for students who can support us in this matter and are working on the basic functionality of the software.

In addition to the review, there were also a handful of workshops with all REXUS teams. It was talked about the planned tests of the teams and on the grounds of the ZARM. The tests include vacuum, vibration and thermal tests, which we are fortunate enough to be able to do on the university’s campus.
The preparations for the launch campaign were also discussed. Most interesting part of it was the, now also with information of the teams equipped, procedure of the rocket launch, the so-called Timeline. The timeline lists all the steps that need to be taken before, during, and after the rocket launch to ensure a safe, smooth, and successful flight. It also plays an important role in when which experiment becomes active and which has also been discussed. In any case, an interesting insight into the plans of our neighbors!
An even deeper insight offered us the interface discussion. It was clarified, which interactions between the experiments of our rocket RX27 can occur and which effects they have. An example is the question of when the experiments HADES and BLACKBOX2 should be separated from the rocket.
Above all, the temperature was interesting for us. In order to ensure the right viscosity of our resin, we need a certain minimum temperature. So far, this limit was + 20°C, so we are on the safe side. But the directly adjacent experiment by FLORENCE must not be warmer than 17°C due to material reasons. Unfortunately, the original plan of heating the entire rocket to 20°C is out and we have to come up with a solution to this problem.

At the final Ask-an-Expert on Friday solutions could already be found, it would for example be possible to incorporate insulation material or a heating coil into the experiment. At first, however, we will probably try to estimate the heat loss with the help of a thermal simulation. In addition, questions about the cameras, the cable routing and the documentation were answered.

On the technical side, the two days were packed and extremely successful. We are on the right track with our experiment and know what we have to do in the coming weeks!

The visit to Oberpfaffenhofen was rounded off with a visit to the Augustiner at the Wörthsee, where we spent a very nice evening with the REXUS/BEXUS team and the other experiment teams.

That’s it for now. In the next few weeks, the examination phase will be up for grabs, which of course has priority for us. From the end of July, we will reorganize and start the lecture-free phase of the project, the implementation.

Until then we wish you a nice time and of course a lot of success for the exams, if you have some!


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