Low gear leads to high thrust, low speed and high fuel consumption, while high gear is associated with high speed, low fuel consumption but low thrust. We call this technique “Constant Power Throttling” (CPT), a function similar to the shifting of gears in an automobile. A unique feature of the VASIMR® engine compared to other rockets is its ability to vary its exhaust parameters, thrust and specific impulse (Isp), while operating at a fixed total power level. Variable I sp and thrust at constant power.
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A magnetic nozzle accelerates the hot plasma to produce useful thrust. The plasma is made in the first stage and further heated, by RF waves, in the second stage. It is comprised of a two-stage rocket core, each stage with its own Radio Frequency (RF) Coupler. Unlike most chemical rockets that need complicated pumps and turbomachinery, the VASIMR®, does not have any moving parts. The VASIMR ® has the potential to transform the way we move around in space, making it more economical, fuel efficient and sustainable and opening a new realm of opportunity for a space-faring economy. A strong, externally applied, magnetic field confines, guides and ultimately accelerates the plasma, letting it escape to provide useful rocket thrust. The RF ionizes the gas, turning it into plasma (a very hot electrically charged gas). In the VASIMR engine, powerful radiofrequency (RF) waves are launched by special antennas (we call them “couplers”) wrapped onto a ceramic tube where a propellant gas is fed. The VASIMR ® engine is a high-power electric rocket engine, suited for a wide range of missions from economically sustainable logistics operations in cislunar space to high-speed transport in deep space.
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It is the product of more than 25 years of NASA and Department of Energy (DoE) R&D in plasma physics and space propulsion technology, plus 15 years of added technology maturation in the private sector by Ad Astra Rocket Company. The Variable Specific Impulse Magnetoplasma Rocket (VASIMR ® ) engine, is Ad Astra’s flagship project, a disruptive development in the space propulsion status quo.