Abstract: Electric In-Space propulsion uses no fuel. Thrust is generated as impulses where in space, momentum is additive. Rotary motion is converted into bi-linear oscillation of a carriage then its momentum rectified: The carriage is shifted forward during low inertia, so momentum used to oscillate the carriage forward is conserved to be used later in the cycle. Reverse carriage oscillations are deflected. This creates only a pulsed demand on the electric power supply—thus too fulfilling the law of Conservation of Energy: Newton's third law of motion is upheld because action and reaction are not simultaneous events, so in this engine, the inertial delay occurs at post carriage shift during part of the rotors' orbit—when centrifugal force emerges: The centripetal force of the rotors are cyclically nullified by the shift resulting in surges of centrifugal force.

Abstract: Electric reciprocating impulse engine converts rotary motion into linear motion at a frequency high enough to overcome inertia and propel said engine with load. The present invention loses substantial weight while running without losing mass and could drive a satellite already in orbit or beyond and propel a spacecraft between the planets with five-times the efficiency of conventional propulsion systems. Each of the two carriages below the control platform of the apparatus hold a pair of elongated eccentric rotors that counter-rotate forcing said carriages to bounce up and down on rigid spring-loaded rods at a precise distance with equal force in opposite directions on the common mainframe. The two carriages can be phased 180 degrees apart with thrust determined by the rotor's mass and velocity, the latter which can be finely controlled by varying the voltage to the rotor drive motors.