This was shown to me 19 years ago in a Hughes 300 by my instructor, he only did it once and my memory of it is a little hazy, but we were doing emergency procedures training and jammed pedals and fixed collective was shown.. .. .As I recall, he selected a BROC airspeed and slowly reduced airspeed as we climbed, the aircraft got to a stage where it would not climb anymore with the reducing airspeed. At this point the cyclic was sluggish and as I recall, this was close to the vortex ring state as the aircraft started to descend. He increased the airspeed slightly and regained full cylic effectiveness.. .. .As I recall, he had a descent happening and he flew the aircraft at a speed which he controlled the rate of descent. We didn't do a full touchdown, however he got a descent happening and by use of airspeed controlled the rate of descent. I can't recall how high we climbed till all this took place, but it was 2or maybe 5 thousand feet. . .. .This was so long ago, I have probably forgotton the precise technique, but it was shown to me as part of his training school syllabis.. .. .I have never had the technique shown again in any other machine, multiengine or single turbine.. .. .As I said, this was one event 19 years ago, but he did display a technique that appeared to work, I cant remember the manifold pressure, but it was cruising power.. .. .Maybe Nick could elaborate, is this another method?