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Just to add my 2d, if the firing impulses are halved by cutting down to
one rotor, is not the torsional frequency also halved? Or am I missing
something. If so, to what effect?<<<
I don't possess the engineering vocabulary to properly address this, but in layman's terms, I'd tend to look at this a little differently. I would think that when you're talking about torsional issues, the firing pulses are simply the "exciters"... the resonant system is the structure in question. I would think that in the single rotor the resonant frequencies would actually be raised rather than lowered, due primarily to the reduction in mass of the system. Think about a guitar or piano string... the big fat ones, with more mass, have resonant frequencies that are far lower than the little skinny ones. I propose that a power system is no different, and that its total mass is also a part of the equation. The single rotor e-shaft is a little stubby thing, with much more torsional rigidity than that of a 2-rotor. Ergo, its resonant torsional frequency is probably considerably higher than the 2-rotor's. Further, if you consider the resonance of the total system, if any one component has a higher resonant frequency then the total system's resonance goes up with it. Think about the discussion here to date... if the drive coupling (one component) is tight and stiff, the system's resonant freq is raised. Loosen up or soften that coupling, and the system's resonant freq is lowered, which, as Tracy has so eloquently explained, is the reason that his drive system works so well.
I don't know if I've gotten the point across, but this is how I understand it. I hope it helps.
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