Sling Load
There appears to have been a slight misinterpretation of the opening statement in this thread. It was a specific reference to the intermeshing configuration.
There was absolutely no intent to say that the other multiple rotor configurations, which includes the tandem, coaxial, interleaving, side-by-side, and quad, are any good, at all.
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collective bias
I believe that the accident with the K-Max in Germany was due to the failure of an oil pump.
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Nick Lappos is by far the best person to comment on the following, but in my limited way, I do find the potential marriage of the intermeshing configuration and Sikorsky's Advancing Blade Concept very intriguing.