Phase Four tested its Maxwell engine with water propellant. The U.S. Air Force Research Laboratory's green propellant, Advanced Spacecraft Energetic Non-Toxic, contains a significant percentage of ...
Phase Four won a U.S. Air Force AFWERX contract in 2021 to test iodine propellant in its electric thrusters. Credit: Phase Four SAN FRANCISCO – Phase Four won a Defense Advanced Research Projects ...
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