ERIG: Hydra 4X Test

The video’s show the HYDRA 4X hybrid rocket motor testing from the Fall and Summer of 2018.

ERIG is a team of students from the Technical University of Braunschweig, developing and constructing experimental rockets. HYDRA 4X produces 2000 N of thrust and will burn for 15 s propelling the team’s FAUST II rocket to 10 km in altitude.

ERIG STERN II – Hybrid Engine Test

Video Caption: This was the first hybrid engine test within STERN II. The engine Hydra 4X was developed and manufactured by students of the ERIG Team and tested at the test site of DLR Trauen. It uses the propellant combination nitrous oxide and HTPB. The video shows the engine with CFRP coating and yellow measurements stripes for temperature measurement of the engine surface. The test results will help to improve the engine regarding manufacturing and performance.

HEROS 3 Rocket Prep and Flight Video

Video Caption: On Tuesday 8th November 2016, 10:30 LT, -18°C: our Hybrid sounding rocket HEROS 3 rocket was launched from ESRANGE, Kiruna. At almost perfect weather conditions and great visibility it reached an apogee of 32.3 km according to GPS and acceleration data and was successfully recovered with the drogue and main parachute being released. This sets a new record for European student and amateur rocketry. Furthermore, to our knowledge this is also a new altitude world rocket for hybrid rockets built by students. The maximum speed of HEROS 3 was 2600 km/h with a Mach number of 2.3.
The hybrid rocket engine delivers 10 kN of thrust with a paraffin-based fuel and Nitrous Oxide as the oxidizer.

32.3km Altitude Record for HYEND

After going through their data from their recent successful HEROS 3 rocket launch the students of HYEND have confirmed that the rocket reached a peak altitude of 32.3km (105,971 ft) and therefore taking the European student and amateur rocket altitude record, previously held by  Delft Aerospace Rocket Engineering.


I find it interesting that the rocket had only a 70% fill load of nitrous oxide and was launch at an angle of 80 deg from vertical. Given a full tank and greater launch angle the team have predicted that they could reach 50km in altitude, that is half way to space! Very impressive.


From the Teams Facebook

On 31st October 2016 at 12:00 UTC, HEROS 2 was launched from the MRL launcher at ESRANGE Space Center in Northern Sweden. The countdown went very smoothly: The tank filling with nitrous oxide was quickly done, the heating system both at the GSE and at the launch rail with the air-heated styrofoam box brought the nitrous oxide to the right temperature for launch, despite the cold and freezing outside temperature. The ground and on-board electronics worked flawlessly during thecountdown. A lot of great video material of the lift-off and the ascent into the clouds was produced and will be presented in the near future.
However, an electric interference right at the zero time of the countdown caused a failure of the on-board electronics and telemetry system. Without a telemetry signal it was not possible to get any information about the position during and after flight of HEROS 2. The recovery system was most likely affected from the failure as well. A helicopter team was searching at the nominal impact point, however the weather and sight conditions made it impossible to find the rocket and new snow in the night after the launch makes it less probable to recover the rocket in the next days.
The video material and sound recordings were analysed and all evidence suggests that the hybrid rocket engine HyRES worked nominal during the whole ascent of the rocket. Currently we are investigating the electronical interference with the power supply lines and the main ignition impulse to find a solution and prevent the error from happening again. Then, a decision will be made if HEROS 3 can be launched in the coming days, but we have to monitor the progress in the failure analysis and the launch weather. Currently our launch window is open until the 9th November.

Abit unfortunate for the team from the University of Stuttgart.

They do have an exact replica of the rocket, HEROS III, hopefully they can resolve this issue and then fly HEROS III to have another attempt.

In the mean time here is another video of the launch.

HyEnD – HyRES Hybrid Rocket Engine Test 16 & 17

Video Caption: Test 16 of our 10000 N Hybrid Rocket Engine “HyRES”. This was done with the configuration and conditions during our launch in October 2015. As we expected from theory, the combustion is clearly unstable under these conditions and we modified these conditions for the next test 17, which shows excellently stable behavior.

HyEnD – Hybrid Engine Development:

From the teams Facebook page:
A further important step of our analyses and tests was, to get to the bottom of the launch failure last year. With test 16, as in the video below, we could show, that a too low nitrous oxide temperature at launch was responsible for instable combustion in the engine. This increase thermal and mechanical loads and lead to the failure of the engine.The configuration and conditions of test 16 represented the same as the launch last year. Compared to test 17 the differences in stability can be recognized easily.

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