It's nearly Hallowen - so explain this please...

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A

[Fozzer]

Martyn... ....

There are two blokes (like me) there, with long pieces of thin cotton, opposite sides of the swing, alternatively pulling the cotton, to fool the Sun newspaper, and the surrounding crowd into thinking that there are magical forces out there, perfectly capable of fooling the masses...

...trust me... ...!

LOL... ...!

F... ...!

Halloween?.....got my garden gate electrified in readiness... [smiley=evil.gif]...!

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Absolute pish Fozz!

It's done by Pixies I tells ya!!



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PS: Good work on the garden gate.

[john_uk]

i agree with martyn, its those darn pixies!!!

[Mobius]

Ever seen the Tacoma Narrows bridge?

Probably the perfect situation for vortex shedding and resonance.  If you notice the swing on the left at the beginning of the video, it moves at the same frequency, but in smaller motions.  So the wind is probably blowing from the left to the right, so as a vortex is shed off the fist swing, it pushes that swing a tiny bit in the opposite direction, and that vortex then pushes the second swing (like wake turbulence flipping a small aircraft).  So, as the first swing starts swinging and shedding vorticies, the second swing is doing the same thing, only it's also being affected by the vorticies from the first swing, which increases it's swinging amplitude even more.  If you notice, at the beginning of the video, all three swings move in a relatively similar fashion, until the second swing really starts to go, and the flow around the third swing is disturbed so much that it isn't affected by the vortex shedding of the first two swings.  The shedding frequency is the resonant frequency of the shedding structure, so the frequency at which the vorticies hit the second swing in addition to the vorticies being shed off the second swing is exactly the right freqency to make it resonate, which is why it swings back an forth, and once it gets going, the shedding off just the second swing is probably enough to keep it going.

That would be my guess.

Vortex Shedding


Or, as one of my professors says, "It's probably just the magical pixies of digital image land".

[RitterKreuz]

Martyn... ....

There are two blokes (like me) there, with long pieces of thin cotton, opposite sides of the swing, alternatively pulling the cotton, to fool the Sun newspaper, and the surrounding crowd into thinking that there are magical forces out there, perfectly capable of fooling the masses...

...trust me... ...!

LOL... ...!

F... ...!

Halloween?.....got my garden gate electrified in readiness... [smiley=evil.gif]...!

for 10 straight days? with people walking around on all sides of this thing?

im sure there is a logical explanation but i seriously doubt string has anything to do with it.

[Fozzer]

Martyn... ....

There are two blokes (like me) there, with long pieces of thin cotton, opposite sides of the swing, alternatively pulling the cotton, to fool the Sun newspaper, and the surrounding crowd into thinking that there are magical forces out there, perfectly capable of fooling the masses...

...trust me... ...!

LOL... ...!

F... ...!

Halloween?.....got my garden gate electrified in readiness... [smiley=evil.gif]...!

for 10 straight days? with people walking around on all sides of this thing?

im sure there is a logical explanation but i seriously doubt string has anything to do with it.

Buggar....

..another one of those "Serious" Blokes with no sense of the fun of conspiracy theories involving lengths of string, Pixies, and the vulnerability of Human Beings......!

LOL... ...!


F.... ... ... ...!

[TSC.]

Buggar....

..another one of those "Serious" Blokes with no sense of the fun of conspiracy theories involving lengths of string, Pixies, and the vulnerability of Human Beings......!

LOL... ...!


F.... ... ... ...!

Now now Paul RitterKreuz is quite right about the ten day bit, it's gonna be pretty hard to keep that going with string for 10 days.


Especially seeing that Pixies are now legally only allowed to work for 8 days straight - as we all know.


Anyway, it's all academic because it's the swinging is caused by a ghost.



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[Fozzer]

Buggar....

..another one of those "Serious" Blokes with no sense of the fun of conspiracy theories involving lengths of string, Pixies, and the vulnerability of Human Beings......!

LOL... ...!


F.... ... ... ...!

Now now Paul RitterKreuz is quite right about the ten day bit, it's gonna be pretty hard to keep that going with string for 10 days.


Especially seeing that Pixies are now legally only allowed to work for 8 days straight - as we all know.


Anyway, it's all academic because it's the swinging is caused by a ghost.



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LOL...!

Martyn...

I've long given up worrying my tiny brain about 'fings which don't make sense.... ....

...I just nod my head....say "Yes"...and go back to sleep again... ...!

...LOL... ...!

F....I'm stringing this Thread out.. ...!

[RitterKreuz]

i could be wrong but dont pixies avoid play grounds because they are afraid to be caught by little kids?

[Ashar]

I don't believe in....oh wait, those are fairies...darn it

[ThatOnePerson]

odd

[a1]

Way out of my league to explain.

[beaky]

Interesting possibility... to me, the idea that it might be balanced just right for such behavior is more interesting than spooks or pixies... and more likely (although not very).

But...notice that the clip begins with someone touching it. And the other two swings are moving quite a bit.

Also:  the video does not go on for ten days, and I have yet to see any swing in good repair go unused for ten days, so I really doubt that claim.

Then there's the fact that it's from the Sun...  just in time for Halloween...  ::)

[Chris_F]

[quote]
Probably the perfect situation for vortex shedding and resonance.