The idea presented herein comes from the essay "How to build a flying saucer after so many amateurs have failed" by T. B. Pawlicki (available at http://www.keelynet.com/ufo/ufo4.txt). It can be summarized as the possibility to set up a mechanical system that thrusts itself on the basis of its internal inertial forces.

According to mainstream physics, the sum of all the forces internal to a system is equal to zero, so no resultant force could ensue from these forces alone. In the last part of this exposition it is explained where the flaw of this postulate could be.

Description of the system

An scheme of a system which "thrusts itself" as a consequence of its internal inertial forces is given in the following picture:

It consists of a mass rotating around a center. The key point is that the velocity of the mass is not constant over one revolution: around the bottom of the circle the velocity is V1, then it increases until it reaches V2, it remains at V2 around the top of the circle, an then it decreases back to V1.

Since the centrifugal force that the mass experiences is V*V/R, where V is the linear velocity of the mass and R the radius, it is clear that this force will be greater at the top of the circle than at the bottom. This force is not compensated by the sum of the internal forces of the system, and its average value over one revolution is in the upward direction. So, although the system when let free will wobble back and forth, the net force in the upward direction will cause the system to progressively accelerate in the same direction.

To cancel the torque, to ensure the system maintains its orientation with V2 at the top when let free , you only need to introduce a second system rotating synchronally in phase with the first system but in the opposite direction.

Scientific explanation

See the new physics developed by Gennady Shipov (http://www.shipov.com/science.html).