Silent rotor technology

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Silent rotor technology
I think this tech has been around for awhile. I’ve seem/heard what sounds like the silent tech over my house and over my area going back 10 years. The noticeable lack of repetitive “thud”/”whack”, especially when they are gaining altitude quickly, always made me wonder WTF was going on with
these, especially at night when there were what seemed like test flights or ariel searches going on (no spot lights though).

Do you know if current vehicles have this or is there a previous iteration, maybe even different tech, but still a noise reducing technology?

Source: AboveTopSecret

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