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Two of the OV-22's flew over me last weekend, maybe 3000 ft above ground level. They are VERY noisy.
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They tend to deploy near us for civil emergencies (hurricanes, floods, and such) and they are a rare treat to spot. And yes, they have a unique noise signature. The Bass section of the rotary wing orchestra.
I live not far from the coast about 20 miles from MCAS New River. The different sound signatures from all the helos going over all the time are pretty distinctive- Huey's, Sea Stallions, Cobras, an occasional civilian Robinson, and in the past Chinooks (haven't seen them in a while). And the Osprey in nacelles forward mode do sound different. But I never get tired of hearing all of them! Funny how the frequency of the flights increases and altitude decreases in the summer when the young ladies are on the beach!