Solenoid valves control the flow of compressed air from the bottles to the nozzles ... [Tom] had to improvise thruster control; an Arduino watches the throttle signals normally sent to a drone ...

Turns out this actually reduced the air velocity through the thruster, so he quickly switched back to the original configuration. Tests on a single stage of the thruster were very promising ...

Matt Mikka: So, what inspired that project was that Tesla said they were going to do these cold thrusters, basically high-pressure compressed air. But the issue with the cold thrusters is that you ...