HOUSTON — Ad Astra Rocket Co., developer of the Variable Specific Impulse Magnetoplasma Rocket (Vasimr), is moving forward with modifications to the company’s 200-kw. VX-200 ground test article intended to allow characterization of the engine’s thermal steady state. Thermal steady-state characterization assesses the rocket’s ability to maintain a stable temperature for extended periods. The VX-200SS (SS for Steady State) could be ready for testing in Ad Astra’s suburban Houston ...


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