WARR, students from TU Munich have been hard at work continuing their hybrid propulsion work and experimentation. With the latest fuel grain being assisted by 3D printing the shape and then pouring the HTPB in, thus avoiding any demolding issues that may arise as it is all burnt as one.
I know RML Spacelab have used this technique, taking it as far as getting individuals at home with a 3D printer to print and send in the mold parts required. A great way to contribute to a project.
I look forward to seeing this engine fire, it should be spectacular!
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.
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.
Great to see the team have a successful mission after their incident with HEROS 2 the other week. Goes to show building two identical rockets side by side has its advantages.
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.
Video Caption: We had a successful countdown and lift-off of our HEROS hybrid sounding rocket from ESRANE Space Center on October 31st, 2016. The white box around the rocket is styrofoam for heat insulation of the rocket. Video data shows a nominal flight at full burn time.
At lift-off we lost our telemetry connection. Further data is still being analyzed.
Waiting on data, lets see if they ended up breaking the European altitude record!?