TU Wien Space Team Aim for the Karman line and the European Altitude Record

Vienna (TU WIEN) – The Space Team of the Vienna University of Technology wants to know it again: in Nevada (USA) two rockets are launched, which are to reach record-breaking heights.

If everything works out perfectly, the rocket should reach a height of over 100 km – the area where the atmosphere gets thin and space begins. The Space Team of the Vienna University of Technology, an association made up of students from different TU disciplines, will attempt to break records in the Nevada desert with two self-developed two-stage rockets. The previous European record for student teams is 32.3 km.

In the last attempt last year, the goal could not yet be achieved. Now the team tries again. The launch is scheduled between 20.9 and 22.9 – updates are posted on the Space Team’s website.

Much know-how at the Vienna University of Technology

The Space Team has already made a number of remarkable achievements. Various rockets have been successfully launched, a mini-satellite has been built and is still sending data from its orbit, a novel mountain system has been developed, with the probes without parachute unscathed from space to return to Earth.

The technical challenges that needed to be overcome for the record attempt are huge:

For about three and a half seconds, the first stage of the rocket burns. This is then separated from the rest and the upper stage continues for fifteen seconds, until it is then ignited at a height of about twelve kilometers. This is made possible by a sophisticated electronics system, which was developed and built by the Space Team.

“This is a challenging task, and there are countless things to consider such as safety and reliability,” says Project Manager Christoph Fröhlich. “The last time we tried a security mechanism was not wired correctly, this year we will launch the rocket again, and in addition we will try a second improved missile in detail, especially the electronic systems and the upper stage ignition have been revised.”

Both rockets are each just under four meters long and weigh (including fuel) each about 30 kg. In the development, it was important to choose the right materials that could withstand extreme loads – such as special glass fiber reinforced polymers. Due to the strong air resistance, the rocket is extremely hot. At atmospheric pressure at sea level, such a rocket would burn, but as the air pressure and thus also the air resistance decreases, the team hopes to surpass the previous European record for student teams of 32.3 km. Achieving a world record is possible, albeit difficult: a team from the University of Southern California has now reached 100 km. “What height we can ideally achieve is hard to say because the simulations come to quite different results. Ultimately, we will only know when we analyze the sensor data after the flight, “says Christoph Fröhlich.

Video Caption: In September of 2018 the TU Wien Space Team launched the two-staged rocket “The Hound” in Nevada, USA. More information under http://spaceteam.at/2018/10/20/the-ho…

Instagram Pic of the Week

CS: Ballute Testing

I must say the CS parachute department seems to be on the ball, good to see so much work going into recovery!

Video Caption: In an attempt to mitigate the spin we saw with our last manned Ballute jump, we made and tested a small-scale design, which is sown from two sections – top and bottom, rather than single continuous gores. This, we hope, allows better alignment of air intake pockets, which we expect caused the spin on the previous design.

Copenhagen Suborbitals is the world’s only manned, amateur space program, 100% crowdfunded and nonprofit. In the future, a volunteer will fly to space on our home-built rocket.

If you like the video and what we do in general, please go to http://www.copsub.com/support-us and support our project. Donations start from as little as a coffee a month.

CS: Saturday In The Rocketshop 07/09

Video Caption: A quick look into the workshop happenings last weekend.

A quick update on how we modify our swirl injectors to test how larger propellant holes influence their output.

Copenhagen Suborbitals is the world’s only manned, amateur space program, 100% crowdfunded and nonprofit. In the future, a volunteer will fly to space on our home-built rocket.

If you like the video and what we do in general, please go to http://www.copsub.com/support-us and support our project.

Donations start from as little as a coffee a month.

Compliment us by wearing our apparel: https://www.zazzle.com/store/copsub

Solid Rocket Motors 1.5: OpenMotor Tips

Charlie does a great job in summing up the variables in a solid rocket motor and how they effect the design, you can find OpenMotor here to work along.

Video Caption: Hi Rocketeers! One of my Patreons requested a video that went more in depth on failures that can occur in simulating solid rocket motors. This video shows some of the ways a motor design can be found deficient in simulation before you build one.


Instagram Pic of the Week

CS: Swirl Injector Testing

Copenhagen Suborbitals have been continuing their testing of swirl injectors (article here), planned for there BPM-100 rocket engine, the group plan to carry out small scale tests on their BPM-5 engine.

Swirl injectors are most commonly found in Russian rocket engines and more predominantly with a liquid/gas injection scheme (coaxial swirl) where the gaseous propellant is directed down through the centre and the liquid propellant injected tangentially along the element wall, producing a swirl. This fuel swirl produces a cone at the outlet where when the oxidiser is introduced it mixes in this cone thus giving good atomisation of the propellants.

Coaxial Swirl Injector Element

As being investigated by CS, a liquid-liquid coaxial swirl injector has been used in the past with storable propellants but also with liquid oxygen and kerosene as used in the RD-0110/0107 engine which has served as an upper stage in various launch vehicles over the years.

Shear Coaxial Injector Element

The coaxial swirl injector should not be confused with a shear coaxial injector (also called a coaxial hollow post) as found in the Space Shuttle Main Engine (SSME) or RS-25. This injector element is typically used with liquid oxygen and gaseous hydrogen  (phase change after absorbing heat from the cooling jacket). The gaseous hydrogen flows at much higher velocity compared to the liquid oxygen where the differential in this velocity creates a shear action, breaking the liquid oxygen into droplets, hence the name. This injector does not work well with both propellants being liquids as the pressure drop required to achieve the high velocity would become too great.

You can find more info on swirl injectors below or in any liquid rocket book,
Swirl Coaxial Injector Development
Swirl Effect on Coaxial Injector Optimisation
History of Liquid Propellant Rocket Engines in Russia
Combustion Characteristics of Bi-liquid Swirl Coaxial Injectors with Respect to a Recess