>>Over the years I have witnessed many over unity processes, especially in the area of harmonics. Probably the best example I can give is running a low speed diesel main engine for prolonged periods (more than 1 minute) within one of it's critical speeds, the resulting harmonic amplification can result in the total failure of the engine i.e. the shearing of a 36" Diameter 100 Ton steel Crankshaft Journal.
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>Sounds like resonance to me.

Yes it is resonance, but the question is where does the additional energy come from.
When I quote 100 Ton steel it means a shear stress off 100 Ton per square inch and with the maximum rating of the engine being approx 30,000 hp it cannot cause the damage observed. What are your thoughts on how process occurs.

I'll ask again where does not flash of light come from in the cavitation example, too hard to answer ?

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>Anyway, why not better stick with the previous example of a pillar supporting a weight. I don't see any reason to call this a "over unity" process, unless somebody manages to get energy (e.g., electricity) continuously out of it. Even if - AFAIK - this hasn't been done in practice yet, how would you go about in theory to achieve this?

Using multiple prime harmonic injection techniques.