The Rotordyne as a military transport would also have debilitated all of the unsuspecting team on the receiving end, that thing was designed to upset pilots who flew the thunderscreech. Great concept, but golly, OH&S would have a field day, and it probably would have gone down as an attack against the civil population, on both sides. It was pretty loud. It was and is however a good concept, that had poor timing. The acoustic signature would always be challenging unless they came up with some magic for the tip jets.
Actually they had, but it was canned before they got a chance to use them
Westland finally abandoned the project in February 1962 and the Rotodyne Z was never completed. Although lack of faith in the aircraft was the main cause of its demise, a contributory factor was the disproportionate publicity given to the noise made by the Rotodyne's tip-jets, which it was said would inhibit its use in city centres. In fact, well before the aircraft was abandoned this noise had been successfully decreased to less than that made by a London Underground train, which millions of people accept every day; and there was every indication that it would have been reduced even further.
https://aviastar.org/helicopters_eng...y_rotodyne.php