Gravity harnessing.

Gravity is the natural force that can't be reflecting or shielding in any way for nowadays technology at least in popular approach and understanding. However, harnessing gravity is just that acting that can lead to excellent, widespread exploration of the universe in which we are living. Harnessing gravity can open the gate to multidimensional travel or time travel as well. Gravity is mostly known as interaction between two or more material bodies. For occuring gravity is necessary existing at least two objects, where the acting of acceleration can be seen by an observer, or the second body is the same observer. Until today no research has confirmed the mechanizm of gravity in subatomic scale, although some works were performed in this field in relativity physics light what doesn't lead until today to any visible effects in technology if we consider real technology abilities to build gravity propulsions or the other devices based on gravity. No devices were invented in this field until today unfortunately. The body falling in gravity field is weightless and the second case is orbital weightless obtained only if the centrifugal force is equal to gravity acceleration vector coming from the static mass of planet. If the body is to journey in space it will need to accelerate, so if acceleration is positive than on the crew inside will be acting the same force as in standard gravity if they would be placed on the surface perpendicular to the vector of acceleration in straight directional movement of the vehicle. The same situation will be occurring if the crew would be placed on contrary side of the passenger compartment in situation where the spaceship would be slowing down, the force would be opposite in direction. The uncomplicated way of generating artificial gravity is obtaining centrifugal force. Centrifugal force can have negative gravity potential. Gravity can be balanced by centrifugal force or even overcome by that force. Although the centrifugal force is not popular much in our technology if we consider certain acting in technology of space travel, however such applications are possible what was indicated in the past several times by not popular until our days inventors. Centrifugal force depends on mass and velocity and on geometry of the system in which centrifugal force will be created. The static mass can create only that amount of force of gravity as is predicted in the mass of an object. However, we can control the centrifugal force properly to our will, so we can obtain a lot of gravity force using centrifugal force. Despite of fact, that we can't control planetary gravity to use this technology in for instance launching rockets in easier way, we can still focus on centrifugal force application and reaction engines to create propulsion. 

The technology of rotors is significant if to consider the space travel methods. The system with four mases is producing a lot of propulsive forces. I also added the video where I show the imagination of the spaceship with such a propulsion. I also have added the video with rail system, where I present the system of linear propulsion for trains, which is magnetic and mechanic way of propulsion for terrain transport. 

On above picture is the system with application of magnets and pneumatic forces.

On the above picture is explanation that gravity force can be balanced by kinetic energy, there is equivalence of mass and energy.