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A European-based consortium of academic and industrial groups take a very old idea, add a plasma system that seems to be nearly science fiction, whip them together and create quiet, efficient, vector-controlled flight.  That’s the promise, although it seems a bit much to take in all at once.  But the folks at the ACHEON (Aerial Coanda High Efficiency Orienting-jet Nozzle) project seem to think they have a potential winner here.  ACHEON represents two other acronyms, so let’s define those first. The original idea for the project was part of H. O. M. E. R., not of the Simpsons, or even of epic Greek poetry, but of the “High-speed Orienting Momentum with Enhanced Reversibility” variety.  Combine that with P. E. A. …