Gyirodrive is my last idea as it is possible to disperse system not changing weight in a vacuum. A push for its occurrence became video where short-term influence of a force pulses on an axis of a gyroscope is shown. Drawing of the concept of the engine and the description of forces operating in system.

Impulse. Theory.

"Closed, isolated" system. Principle of action: change the impulse of the system center mass. under the influence of centrifugal force. Description, graphics, video of experiments. The summary about prospects of development