Phase Four won a U.S. Air Force AFWERX contract in 2021 to test iodine propellant in its electric thrusters. Credit: Phase Four MOUNTAIN VIEW, Calif. – Propulsion startup Phase Four is expanding its ...
A Phase Four electric thruster using xenon propellant. The company won an Air Force contract to test a version of that thruster that uses iodine as propellant. Credit: Phase Four WASHINGTON — Phase ...
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