I know you weren't the one crying about the downvote, and my smarmy reply was intended for Payback, not you.

As to messenger's original comment, we obviously read it/into it differently. I don't think he was suggesting what you thought he was. I took his comment in the context of the video (plane starting on the ground), which is the way I believe he meant it. I wasn't exactly sure what part of his comment you were being critical of, which may be the reason for my extremely basic explanation. It wasn't to be condescending.
In reply to this comment by sirex:
I guess critical flaw is perhaps over-egging it. But the original statement seems misleading to me. It suggests that without a propulsion system any aircraft is incapable of flight, which is obviously incorrect. Its likely just a case of clarification, but yes, once airborne the aircraft will lose forward momentum and be carried by the wind the same as any lump of rubbish in a hurricane, at that stage its likely its acting as a kite rather than anything aerodynamic.

(Also, i couldn't care less about comment votes. Its the internet.)

In reply to this comment by sirex:
why speed the video up ?

It's not sped up.
450 size helis move that fast.
You should see what a 250 or 200 does (the smaller the quicker)
This pilot is basically 'competition level', skill wise.
Search for "rc 3d helicopter" and you'll find plenty of material like this.

-scheherazade