There is an existing rotor blade configuration (not used in civililian aircraft because its expensive to manufacture that can all but eliminate the outward wake turbulence leading to the noise you hear when the helicopter is not right over your head. SO that just leaves what you hear when it is right over your head. Flying that low you wouldnt hear it until the last minute and what you would hear wouldnt sound like a helicopter, more like a light aircraft.
Or in this case they wouldn't want the technology to fall into enemy hands. Its been SOP for any advanced military for years.
Or in this case they wouldn't want the technology to fall into enemy hands. Its been SOP for any advanced military for years.



nice, needs more bubble wrap?
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