Space propulsion startup Phase Four says test results remain on track to develop a new generation of electric thrusters that boast the same performance as current Hall effect and gridded ion systems for the burgeoning small satellite market, but with greater reliability and orders-of-magnitude lower cost. The California-based company, which has already demonstrated its scalable electrodeless radio-frequency thruster (RFT) concept at performance levels as high as 50% compared to current ...

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