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Stuttgart students launch self-built rocket into space
The university group HyEnD of the University of Stuttgart with the self-built rocket N2ORTH. Photo: HyEnD / University of Stuttgart
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Stuttgart students launch self-built rocket into space
by Staff Writers
Stuttgart, Germany (SPX) Apr 19, 2023

The Hybrid Engine Development (HyEnD) student team at the University of Stuttgart spent around three years developing, manufacturing, and testing its hybrid rocket. In mid-April, the rocket will be launched into space from the Esrange rocket launch site near Kiruna in Sweden. If all goes well, the students will set a new world altitude record for student-built rockets.

The hybrid rocket is 7.80 m long and weighs around 70 kg. It was built by around 60 students from the University Group HyEnD of the University of Stuttgart. "It's one of the most powerful and advanced student-built hybrid rockets in the world," says Max Ochsle, HyEnD project manager. With this, the students have big plans: They want to beat their own altitude record of 32 km for student-built hybrid rockets, which they set in 2016.

The students also hope to cross the boundary into space at an altitude of 100 km. In addition to the world record for hybrid rockets, this also makes the world record for student-built rockets in general possible. The previous record is 103.6 km and was set by the University of Southern California (USCRPL) team in 2019. "The world record is within our reach. We could indeed beat it," says Ochsle. Ochsle is well aware that the record depends on other factors such as the weather.

It is still unclear exactly when the record attempt will take place. The window is scheduled between April 14 and 25. Because the schedule could be changed at short notice, HyEnD provides regular updates on its website. In addition, a livestream of the launch is planned on the Youtube channel of the Swedish Space Agency SSC. On site in Sweden are 16 members of the student group, including Ochsle, the 25-year-old project leader: "The launch of the rocket will be a special moment for me." Over the past three years, a lot of blood, sweat, and tears have gone into this project. The countdown to the launch will certainly be exciting. But we are confident that everything will go according to plan. Of course, I'm most looking forward to the moment when the rocket takes off."

In order to be on the safe side, the students have two identical rockets on site. On one hand so they have a back-up in case something breaks during launch preparations. On the other hand, because the rocket project is quite ambitious for a group of students. For the first flight of an untested rocket, there are restrictions on the launch angle and thus on the flight altitude. If the first flight goes well, students hope to fly higher on the second launch.

Hybrid engine delivers 1.5 t of thrust
The N2ORTH rocket has a hybrid engine that uses solid fuel and liquid nitrous oxide. The name N2ORTH alludes to both nitrous oxide (N2O), which is used as an oxidizer, and the launch site in the North. In order to make it as light as possible, it was built almost entirely of composite materials.

"We are particularly proud of the engine which we developed ourselves. With its thrust of up to 1.5 t, it is one of the most powerful and efficient student made engines in the world. Another special feature is the parachute, which must be able to withstand supersonic speeds. Because there are no commercial parachutes available for these requirements, we made it ourselves," says Ochsle. Because of the high flight speeds, the rocket shell is exposed to enormous temperatures. The structural parts were therefore laminated with a high-temperature epoxy system developed in house. The rocket also has a thermal protection layer made of cork. The students manufactured most of the components themselves in the workshops of the University of Stuttgart.

N2ORTH Rocket | It's time for launch!s
The development of the rocket was made possible by the STERN student experimental rocket program funded by the German Aerospace Center (DLR). The project began in the fall of 2019, and the launch in Sweden will mark the completion. The project is located at the Institute of Space Systems (IRS) at the University of Stuttgart. The Materials Testing Institute provided workshops and rooms. In addition, numerous other institutes have supported the students in their endeavors.

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