re: Paper for EmDrive propulsion leaked (nerds unite!)

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meaning the engine doesn't use fuel to cause a reaction

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These designs work by having a magnetron push microwaves

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These two statements are contradictory. Magnetrons require electricity, a lot of it relative to the microwave energy generated as they are not very efficient. Producing electricity in a spacecraft as on earth requires conversion from another source of energy usually some type of storable fuel.