Some thoughts on how the TPU might work.

[sparks]

    "No mass, no intertia"   I think you nailed it.  Mass comprised of potential energy.  The relative inertia of each body of mass being the force that causes energy exchange between the two bodies or inertial frames.  Faraday's law states that an electrical potential will arise at the interface between two magnetic fields of differing flux or direction.   Two cars moving down the highway  one behind the other, no inertial exchange between the two-no voltage.  One increases it's inertia by stepping on the gas ( we see it as speeding up when actually we just changed the cars inertia)  One changes it's inertia by stepping on the brakes. If the relative direction of the two inertial frames is non-interfering: the car in front speeds up the car in back hits the breaks.  No voltage.  You know what happens when it is the other way around.  All of a sudden the potential energy stored in the inertial frames is exchanged until they equalize their inertia and relative direction.
   Magnetic field-Inertial frame same thing.

[Feynman]

Just a comment on "sound waves" references and quotes from SM earlier in the thread...

Sound waves are LONGITUDINAL !  Regular EM energy (radio waves) are TRANSVERSE.



That's a slinky by the way. 

[sparks]

   A longitudinal wave can be produced electrically by selfinduction of a coil experiencing high-frequency pulses.  The energy inducing into the next turn instead of applying voltage across the whole coil and waiting for the current to flow.  Each coil acts as a transformer primary and secondary.  First coil emf manifests (more or less instantaneously depending on the reactance of the wire) with the applied voltage  which induces a magnetic field change in the next coil and so on down the coil.  You can see by this that the kickwindings turn has to be matched inductively to the preceding coil.  Sometimes the emf never even gets to the end of the coil and you effectively choked the high-frequency from passing into the rest of the circuit.    That's why you need a couple of frequency inputs in the tpu because of the transformation losses between each kick winding coil. SM may have used bailing wire between the coils of his kick windings so that this inductive distribution of energy is definitely going to happen. I am not sure if Tesla did this or not in his primary windings,  but either way it's a good way to insure direction of the apparent magnetic field flow. 

[Feynman]

I can't wait to start experimenting with this....

sparks, what sort of high frequencies are you referring to? khz-Mhz ?

also, can you think of any good ways of measuring longitudinal waves?

thanks,
Feynman