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Message: <blockquote data-quote="yasotay" data-source="post: 24728" data-attributes="member: 291"><blockquote data-quote="sferrin"><blockquote data-quote="doggedman">That said, one of the more innovative concepts I've seen to address the problem of emitted noise from rotating wings is something called the stop-rotor.  The stop rotor aircraft takes off and lands just like a normal helicopter; but during cruise (and while penetrating enemy airspace), the wings are locked in a fixed position and so the aircraft is configured as a normal fixed wing aircraft.  Except in an LZ (landing zone), the aircraft could be configured as any stealth aircraft.</blockquote>Yeah but then that's not really reducing rotor noise because it isn't on.  Kinda like saying you could reduce commercial jet noise by not flying them.</blockquote>And the stopped rotor technology has been put on the back burner for a while.  Another way to reduce the noise signature of rotorcraft is to change the plan of the rotor tip (as in tilt the rotor).  While the V-22 is by no means silent, I can tell you from first hand experiance that it is exceptionally quiet compared to a conventional helicopter.</blockquote>