Nick
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.. the intermeshing could be worse, because the blades directly fly in each other's wakes"<
You have certainly hit on one of the primary concerns. There seems to be very little information available on this subject, for twin rotor helicopters. I have a 146 page Prewitt report on the intermeshing Flettner FL-282, which is mainly devoted to plots of the vibration under various flight conditions. Only one of the motions appears to exceed the pilots comfort level.
Would you be willing to give a quick comment or two on the rotor-rotor induced vibrations that were experienced in the S-69 (XH-59) ABC?
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Let me know how it works, OK? "<
Hopefully, we live that long. <img src="smile.gif" border="0">