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 ...

A schematic diagram of a prototype microwave air plasma thruster and the images of the ... This device consists of a microwave power supply, an air compressor, a compressed microwave waveguide ...