Habermacher, I have myself derived the formula E/V = cccc / (8 pi G rr). Derivation of the formula is in two my artickles.
1. IGOR PROKHOROV, "The energy of gravitational field and vacuum", Vorträge des Kongress "Raumenergie-Technologien 2000", Bregenz, April.15-16, 2000, ss.102-166.
2. IGOR PROKHOROV, "On a new Interpretation of some facts of classical mechanics", Materials of the VII international Research and Practice Conference "European
Science and Technology", Vol.2, April 23-24, 2014, Munchen, ss. 533-542.
The first article is wroted in Englisch, but the derivation of formula is not very rigorous there. Second artickles is wroted in Russian, therefore you need to produce translation. And derivation of the formula in this article is rigorous and correct. By the way, in second artickle I deduce also the most common formula of the free energy E = mcc. The formula has the following physical meaning: when we transmit the energy E to the vacuum, it reacts generating the substance in quantity m = E / cc. Potential energy is also an error. In reality, the energy of gravitational field exists, but not potential one. When we lift a Stone, we produce a work over gravitational field and transmit our muscular energy to the field. After that, when the stone falls under the action of gravitational field, the field releases ist energy to the stone.
When I had understood all these relations, I had began to seek the Facts and Technologies which could demonstrate the liberation of energy from the vacuum. I had found numerous Facts and Technologies. In 1952 was found very strange Effect in one of Soviet Institute: metallic ball falls upon massive metallic plate from Height 10 meter and recoils after collision to Height 13-15 meter. I repeat: it begins to drop from 10 meter and lifts to the height 13-15 meter. Such effect is in so greate contradiction with classical science that our Academicians have decided "to forget" the Effect. My Explanation is following: the physical vacuum deforms itself in moment of collision with the ball and gives back much Energy that hurls back the ball to 13-15 meter.
In 1970 Belorussian physicist Uscherenko had found other strange Effect: small grain of sand collides with massive metallic plate at velocity circa 2 km/sec and burns a through hole in the plate. Calculations have shown that we need the Energy for such Effect 10 000 times more than kinetic Energy of the sand grain. Uscherenko was silent 20 years relativ such Effect. Why? Er was afraid that director will expel him from Institute for such results. My Explanation is the same as previous one: vacuum deforms itself in moment of collision and liberates very greate Energy that burns the hole in plate.
7 years ago I and my Partner have made a small unit which formed the Stream of physical vacuum. Wnen the Stream penetrates into a light turbine, the turbine begins to revolve. Unfortunately, we had no needful Equipment and therefore the power of our Unit was very small (may be, one microwatt). But, the important thing was the fact of Rotation of the turbine under action of physical vacuum Stream rather than power.