What makes my idea for time travel so unpractical.It relies on einstein theory of relativity.
Well, first it's impractical because it misstates Special Relativity. Stacking "chips", all moving in otherwise uniform motion, doesn't result in time dilation among the chips. It does result in time dilation with respect to the "stationary" observer. But the "chips" can always take the relativistic position and say it is the observer that is moving and they are "at rest". That's why it is called Relativity. If you have them arranged in a stack on a spinning disk the situation goes from Special Relativity to General Relativity because the chips no longer have a "uniform motion of translation" - moving in a straight line at a constant velocity. They are under constant acceleration even though they continue to move at a constant "speed". Velocity is vector quantity - speed + direction. They are moving on a disk (or ring) thus they are constantly changing direction, i.e. under constant acceleration. In the case of spinning or rotating objects there is no ambiguity as to which object is the recipient of the relativistic effects.
In any case, the relativistic effects, unless the angular or linear velocity approaches the speed of light, will be virtually zero. Not quite zero but close there to. If spinning a stack of "chips" at high velocity could actually result in extreme relativistic effects, electrical generation would be impossible. A dynamo is nothing more than a large stack of copper "chips" spinning at very high velocity inside a huge set of magnets. I've yet to see a electrical generation plant zip off into the future (or past).
The second impracticality involves the statement that this has not been tested. It has, but only in the sense that the experiment is set up properly with respect to General Relativity. It is a gedanken experiment. You have Molly sit on a chair at the edge of a huge spinning disk facing toward the middle. Billy is sitting on a chair much closer to the middle and facing Molly. They each have clocks that were originally synchronized before the disk started spinning. Over the course of time they will see the clocks desynchronize because Molly will have a larger angular velocity than Billy. They are both rotating at the same RPM but Molly's curved course around the circle is longer than Billy's (the radius from the center to Billy is shorter than the radius to Molly). Now we have Billy and Molly switch places. Eventually their clocks will re-synchronize, for an instant, and then desynchronize again. At first Molly aged more slowly than Billy. Once they switch, Billy gets the larger relativistic effect. They both, however, age more slowly than the stationary observer who is not on the disk. Their clocks will never resynchronize with the stationary observer's clock.
Has this been tested in the real world? Yes. Daily. The GPS satellite clocks have to be constantly re-callibrated due to the relativistic effects of their high velocity orbits. Otherwise GPS coordinates are miscalculated. BUt no GPS satellite has been known to zip off into the future and disappear from "today".
But the same can be said if you drive to work tomorrow and your brother stays home. You spent some time traveling faster than your brother thus your clocks will desynchronize (assuming that you have clocks that can measure attoseconds). We all undergo relativistic effects with respect to each other as a matter of course. Tiny to be sure, but actually measurable during a lifetime.
None of this, however, will ever result in travel to the past. The arrow of time in these scenarios only points to the future.