further searching shows large bead examples with stroboscopic videography to show displacement
http://www.youtube.com/v/skY6qvzpNXI
i agree that the relative mass is great [the oz of dynabeads is roughly equal to the 30g weight that he strapped to it]
if nothing else, it's a fun science project ;)
funny enough, if you read the responses to any of these "proof" videos, one of the most common is "what's to stop me from using BBs/sand/etc?"
the most common response is "possible clumping, lower density means more volume" which, to me, is marketing more than anything else.
From: "ponsaerts.filip@telenet.be" <ponsaerts.filip@telenet.be>
To: st2 owners <st2_owners@yahoogroups.com>
Sent: Wednesday, November 23, 2011 10:51 AM
Subject: Re: [DucatiST] Dyna Beads
Hi Aaron,
With respect to the video, I will not claim trickery either, but this video does not answer my question... ;) Sorry
The video does not show the arrangement of beads while turning, which is the major item of their claim.
But it does bring a cheap alternative to mind.... As the bottle gets heavier with the beads, I can do the same with any material I put into that bottle....
So for all the users of dyna beads, why not start using some water, dry sand, or other cheap stuff in your tire which will evenly spread and resist the movement of the heavier part of your tire. ;)
Sorry, I could not resist ;))
Filip
You do not need to drink seawater to know it is salty.
----- Originele e-mail -----
Van: "Aaron Grossman" <agrossma07@yahoo.com>
Aan: "st2 owners" <st2_owners@yahoogroups.com>
Verzonden: Woensdag 23 november 2011 16:26:41 GMT +01:00 Amsterdam / Berlijn / Bern / Rome / Stockholm / Wenen
Onderwerp: Re: [DucatiST] Dyna Beads
From: "ponsaerts.filip@telenet.be" <ponsaerts.filip@telenet.be>
To: st2 owners <st2_owners@yahoogroups.com>
Sent: Wednesday, November 23, 2011 7:28 AM
Subject: Re: [DucatiST] Dyna Beads
With respect to the video, I will not claim trickery either, but this video does not answer my question... ;) Sorry
The video does not show the arrangement of beads while turning, which is the major item of their claim.
But it does bring a cheap alternative to mind.... As the bottle gets heavier with the beads, I can do the same with any material I put into that bottle....
So for all the users of dyna beads, why not start using some water, dry sand, or other cheap stuff in your tire which will evenly spread and resist the movement of the heavier part of your tire. ;)
Sorry, I could not resist ;))
Filip
You do not need to drink seawater to know it is salty.
----- Originele e-mail -----
Van: "Aaron Grossman" <agrossma07@yahoo.com>
Aan: "st2 owners" <st2_owners@yahoogroups.com>
Verzonden: Woensdag 23 november 2011 16:26:41 GMT +01:00 Amsterdam / Berlijn / Bern / Rome / Stockholm / Wenen
Onderwerp: Re: [DucatiST] Dyna Beads
I don't use dynabeads, haven't tried them, have no opinion either way.
simply to answer the request for a video of how they work, perhaps with a clear cylinder, I googled "video dynabeads work" and found this as the first hit:
http://www.youtube.com/watch?v=eq263AYgyYg
I will not claim that there is no trickery here [as an engineer myself, I can see a number of ways that the veracity can be questioned] but it seems to at least answer your request.
~A
From: "ponsaerts.filip@telenet.be" <ponsaerts.filip@telenet.be>
To: st2 owners <st2_owners@yahoogroups.com>
Sent: Wednesday, November 23, 2011 7:28 AM
Subject: Re: [DucatiST] Dyna Beads
Robert,
A very nice slideshow, so a commercial from Dyna Beads.
As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....
They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.
Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.
They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)
Filip
A very nice slideshow, so a commercial from Dyna Beads.
As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....
They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.
Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.
They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)
Filip
Onderwerp: Re: [DucatiST] Dyna Beads
I don't use dynabeads, haven't tried them, have no opinion either way.
simply to answer the request for a video of how they work, perhaps with a clear cylinder, I googled "video dynabeads work" and found this as the first hit:
http://www.youtube.com/watch?v=eq263AYgyYg
I will not claim that there is no trickery here [as an engineer myself, I can see a number of ways that the veracity can be questioned] but it seems to at least answer your request.
~A
From: "ponsaerts.filip@telenet.be" <ponsaerts.filip@telenet.be>
To: st2 owners <st2_owners@yahoogroups.com>
Sent: Wednesday, November 23, 2011 7:28 AM
Subject: Re: [DucatiST] Dyna Beads
Robert,
A very nice slideshow, so a commercial from Dyna Beads.
As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....
They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.
Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.
They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)
Filip
A very nice slideshow, so a commercial from Dyna Beads.
As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....
They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.
Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.
They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)
Filip
Amsterdam / Berlijn / Bern / Rome / Stockholm / Wenen
Onderwerp: Re: [DucatiST] Dyna Beads
Onderwerp: Re: [DucatiST] Dyna Beads
I don't use dynabeads, haven't tried them, have no opinion either way.
simply to answer the request for a video of how they work, perhaps with a clear cylinder, I googled "video dynabeads work" and found this as the first hit:
http://www.youtube.com/watch?v=eq263AYgyYg
I will not claim that there is no trickery here [as an engineer myself, I can see a number of ways that the veracity can be questioned] but it seems to at least answer your request.
~A
From: "ponsaerts.filip@telenet.be" <ponsaerts.filip@telenet.be>
To: st2 owners <st2_owners@yahoogroups.com>
Sent: Wednesday, November 23, 2011 7:28 AM
Subject: Re: [DucatiST] Dyna Beads
Robert,
A very nice slideshow, so a commercial from Dyna Beads.
As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....
They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.
Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.
They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)
Filip
A very nice slideshow, so a commercial from Dyna Beads.
As an engineer, it does not tell me how it works. In fact, I think their story is faulty.
If the beads distribute evenly on an unbalanced tire when it starts, I do not understand now why the beads would "resist" the "going up" of the heavy part of the tire.
Having the beads going in a rotation, when no longer forced to go into rotation, the bead will tend go "outside" of the circle. So when the heavy part of the tire goes up, the bead will just follow.
This is a direct consequence of the centripedal force....
They also do not explain why the beads will distribute evenly on an unbalanced tire when it starts to rotate... To me this sounds like an assumption, but no evidence.
Lastly, a tire is not "flat" on the inside. A lot of friction in there on the beads. so even if their story shows to be right, I think this friction will come in and disturb the process.
They could have easily made a convincing video. Just take a plexy (see through plastic) cylinder, put in some beads, put one weight on the outside to unbalance, and have it rotate. Now that would convince me. Easy to do, isn't it. So why did they not do it..... right ;)
Filip
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