James Woodward and the Space Studies Institute has a Phase 2 NASA Innovative Advanced funded study. They are looking at the implementation of an innovative thrust producing technology for use in NASA missions involving in space main propulsion.
Dr. Heidi Fearn explained in a video made in 2017 how just scaling the power and size of the Mach effect propulsion causes problems. (heat, arcing and other problems). They currently believe they can scale the device to one newton of propulsion and then create large arrays of the devices for more thrust. The constant thrust could last for years or decades by using a nuclear power source.
For Mach effect propellantless propulsion it will be better to go to an array of smaller devices.
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