Comments on: Spinning Fan Optical Illusion

By: jonny rocket

jonny rocket — Fri, 28 Oct 2011 02:25:36 +0000

nice photoshop job.

By: Ms.Observant

Ms.Observant — Fri, 09 Oct 2009 00:34:19 +0000

omg. that second one is crap. it doesnt look like its movin at all ppl, GET REAL!

By: Anonymous

Anonymous — Sat, 23 May 2009 03:52:38 +0000

Before you call this fake, learn how a helicopter works!
They do not change rotorspeed at all!
When the pilot pulls the collective lever to gain more lift, the only thing that happens is he increases the angle of attack on the rotorblades. The rotorspeed however is constant!
This video can perfectly well be real!

By: Anonymous

Anonymous — Mon, 18 May 2009 21:55:00 +0000

Oh fer cryin out loud. Some of you got it, most did not. The camera is shooting at the same rate at which the blades are spinning. They DON’T go faster at all – they change their pitch and angle of attack – the spin rate is constant, thus the illusion that they are not moving.

By: Anonymous

Anonymous — Tue, 07 Apr 2009 11:07:00 +0000

I think the helicopter’s just a toy hanging in front of the camera while there was a real helicopter passing to create the sound. Or the sound was editted, which is also an option. Still quite a good one.

By: Anonymous

Anonymous — Mon, 23 Mar 2009 03:42:00 +0000

i think it may be real, if you look closly at the blades you can see they do in fact move, not very much but it gves the impression that it is just to fast for the camera to pick up

By: Anonymous

Anonymous — Tue, 10 Mar 2009 15:35:00 +0000

Maybe you are the guy who could answer this. Why, in shots of jet engine exhausts, specifically the SR-71′s, does it look like multiple ignitions in the exhaust trail, rather than one long continuous flame. It is quite unique and I have wondered if it is an optical illusion or something else. I don’t know any aeronautical engineers to ask.

By: Anonymous

Anonymous — Sun, 01 Feb 2009 00:01:00 +0000

haha its kinda obvious that it’s a toy plane with a string attached to it. the sky is just a painting or a photograph, and the sound was probably taken from a different video

By: STARSHIP

STARSHIP — Mon, 15 Dec 2008 04:54:00 +0000

The helicopter is true, the camera can’t pick up the fast blades, i get the same thing after flying for a few hours, you can see the blades spinning and they look like that.

By: Autotronics94

Autotronics94 — Fri, 21 Nov 2008 19:38:00 +0000

Dude, it’s so obvious, the blades are oriented to spin at the exact speed, in FPS (Frames Per Second) that the camera records

By: Anonymous

Anonymous — Thu, 13 Nov 2008 00:03:00 +0000

I couldn’t tell whether it’s fake or not, but i agree on that during these manouvers the rpm rate would have to change due to the quite significant change of the g force. it’s like banking an aircraft makes the rpm drop due to increased g-forces. a pilot can compensate for that it would sure take at least some time to adjust. an autopilot would do the same, probably faster, but definitely wouldn’t keep the rpm perfectly constant like this video implies.

By: Sully

Sully — Fri, 21 Mar 2008 00:19:00 +0000

I think you would have to have an incredible shutter speed to pull that off. But if you did and you got it just right it could work. The speed of the rotor does not have to change to pull those maneuvers. A chopper can gain the lift 2 ways. Change rotor speed (did not happen here) or change rotor PITCH. The rotors on that chopper can change the angle at which they hit the air. This is how they are able to have the rotor spinning at full speed and never leave the ground. Alter the pitch just a little and bam… They are gone.

By: Anonymous

Anonymous — Thu, 15 Nov 2007 02:50:00 +0000

This is actually very simple. the choppers rotors ARE moving. they just move at the same speed ast the cameras fps (frames per second). So this looks like the blades are not moving but they are.
This also happens frequently with the human eye, because the eye only registers vision at like 36 fps (i think, i could be wrong on this nuber). So the same type of thing happens.

By: Anonymous

Anonymous — Mon, 18 Jun 2007 15:13:00 +0000

I can’t see the video, but I gather you are talking about a rotor that appears still on a helicopter during flight. Just an FYI; once a helicopters rotor is up to speed it varies very little, a pilot adjusts blade pitch and rotor tilt to move the vehicle. It is therefore very possible for the blades to be synched up with shutter speed (frame rate) during maneuvers.

By: Anonymous

Anonymous — Mon, 18 Jun 2007 14:34:00 +0000

its not fake… a helicopter’s rotor speed will be constant while doing manuevers like that. Instead of the propellers picking up speed to gain altitude, the angle of attack of the blades increases and decreases to give it more or less lift.