[Windflier]

The main rotor of most full-size helicopters rotates maybe 8 or 9 times a second.

This one was rotating so slowly, it looked like a toy. Maybe half a rotation per second.

Growing up on Army bases, I saw helicopters all the time, and as an adult in SoCal, they were a constant presence. I know what they sound like, and I know what the blade rotation speed should look like. This thing broke all the rules.

I have no idea what you saw.

Well, I know what I saw, but I have no explanation for it. It just was. How? I have no clue.

[The Cajun]

Being no way an authority on the subject, I would guess it would have one heck of a blade pitch and a heck of a lot of power would be needed to drive it.
You'd also think it would have a lot of stability problems with such a slow rps.