New Cluster of Cold Gas Thrusters in Development

We are currently developing a new cluster of 400mN cold gas thrusters.


  • Thrust up to 400 mN (depending on input pressure, gas and the used throat size)
  • Any configuration is possible: Direction, canting angle, number of thrusters, with or without additional isolation valve
  • Pressure up to 10 bar
  • Pulsable up to 500 Hz (reaction time ~ 1-2 ms)
  • Lifetime: to be tested
  • No warm up time
  • Available seals: NBR, Silicone, and FKM
  • Low power (2W for one thruster, additional 2.5W when also using an isolation valve)
  • Lightweight: < 180 grams (Configuration as shown: 4 thrusters and isolation valve)
  • No contamination of nearby optics or solar panels when using plain gases
  • Precise, predictable, repeatable
  • ISP depends on the used gas (First tests with CO2 showed a thrust of ~400 mN and a specific impulse of 630 m/s (64s))
  • Compatible with non corrosive gases like H2, N2, He, Ar, CO2, N2O, Propane, Ethane, Coolants like LMP-103S and many more

Cluster of 4 400mN cold gas thrusters with optional additional isolation valve. Thrusters are slightly canted to prevent the exhaust to impact satellite structure. More info’s in the future here.

Liquid propulsion at ARIS

ARIS (ARIS – Akademische Raumfahrt Initiative Schweiz) finished two projects related to liquid propulsion.

  • LEA, building and testing a mobile test stand for liquid rocket engines up 1.5 kN. It was successfully tested with an Ethanol/N2O firing. This was a project with volunteers of ARIS members.
  • PROMETHEUS, a ETH focus project with the aim to modify the LEA test trailer for usage with liquid oxygen. Design and testing a regeneratively cooled 700 N engine.

On both projects our Bruno Berger acted as an advisor. Unfortunately the contract with ETH ended this this year, so it might be the last project we are involved in. Nevertheless, the last years with the students of ETH/ARIS were extremely inspiring and cool!

LEA Project video

Prometheus firing

Prometheus recap of the project

3-2-1 Ignition! ARIS launches it’s HELEVTIA Rocket at the Spaceport America Cup 2022

Last week team HELVETIA/ASTREA launched it’s rocket at the Spaceport America Cup 2022 in New Mexico. It got to an altitude fg 10’300 meters (33’800 feet) Congratulation and thanks that I can be part of that journey!

Helvetia Launch
Ignition! (Click into the picture to get the ARIS posting on LinkedIn)
Full launch feed on YouTube (Listen to the Sound!)

The rocket is screaming (due to combustion instabilities… we knew about that. But hey, it survived!).
This reminds to the Tie Fighter from the Start Wars movies 😁

Featuring new products: Cold Gas Thrusters

We added a new page in our products section: Cold Gas Thrusters. There is the extremely fast 200 mN thruster and the 20 N thruster which is currently under development.
To demonstrate the extreme fast actuation time we let the thruster play Johann Strauss’ “Blue Danube” (Blaue Donau) based on the opening music of Space odyssey 2001. Depending on the played tone it opens up to 2000 times a second fed by 20 bar Nitrogen. The solenoid is driven by a in-house developed microcontroller board.
Link to the video: