Re: [Vo]:Can a Box Fly?
On Tue, 24 Apr 2012, Terry Blanton wrote: This one does by turning inside out: http://www.newscientist.com/blogs/nstv/2012/04/flying-object-propels-itself-by-flipping-inside-out.html?cmpid=NLC|NSNS|2012-2304-GLOBAL|flyingobjectsutm_medium=NLCutm_source=NSNSutm_content=flyingobjects It flies like a water-weenie toy: smoke ring propulsion. Ring vortices can sometimes move without turbulence, since they are themselves a stable form of turbulence (vortex shedding.) Here's their standalone vid: http://www.youtube.com/watch?v=CLxWnGKaYIk Speculating on shockwave-suppressed smoke-ring propulsion back in 2000: High-speed Vortex Blimp http://amasci.com/amateur/vortgen.html#blimp Question: inside a large sphere of fluid hanging in free-fall, if you launch a travelling vortex-ring inside, will it be disrupted when it hits the surface of the sphere? Or will pass through the interface and carry a blob of fluid into the surrounding space? If the latter, then the large sphere could be propelled by ejecting small spheres ...but wouldn't it only experience a reaction force at the moment the small sphere left the main mass, and not when the vortex-launcher was originally fired? :) Yet a ring-vortex is composed of closed-loop flows, so how can it carry linear momentum? Yet apparently it does, since a vortex-launcher experiences a non-negligable kick when flinging out a vortex-ring. I'm thinking about pulsed-detonation smoke ring engines where the exhaust orfice is the intake as well. Also, crowds of jellyfish living in a spherical pond in free fall. Do jellyfish end up ejecting themselves from one side of the sphere, while their vortex-rings are ejected from the opposite pole, and the pond itself doesn't interact much with either? Need a ten-gallon ball of salt water floating in a hundred-gallon tank of density-matched freon. (( ( ( ( ((O)) ) ) ) ))) William J. BeatySCIENCE HOBBYIST website billb at amasci com http://amasci.com EE/programmer/sci-exhibits amateur science, hobby projects, sci fair Seattle, WA 206-762-3818unusual phenomena, tesla coils, weird sci
Re: [Vo]:Can a Box Fly?
On Wed, Apr 25, 2012 at 4:48 AM, William Beaty bi...@eskimo.com wrote: On Tue, 24 Apr 2012, Terry Blanton wrote: It flies like a water-weenie toy: smoke ring propulsion. Ring vortices can sometimes move without turbulence, since they are themselves a stable form of turbulence (vortex shedding.) Reminds me of my fav toy in the 60's: http://www.skooldays.com/categories/toys/ty1114.htm Speculating on shockwave-suppressed smoke-ring propulsion back in 2000: High-speed Vortex Blimp http://amasci.com/amateur/vortgen.html#blimp Ah! I wonder if the inventor was inspired by that? Question: inside a large sphere of fluid hanging in free-fall, if you launch a travelling vortex-ring inside, will it be disrupted when it hits the surface of the sphere? Or will pass through the interface and carry a blob of fluid into the surrounding space? If the latter, then the large sphere could be propelled by ejecting small spheres ...but wouldn't it only experience a reaction force at the moment the small sphere left the main mass, and not when the vortex-launcher was originally fired? Hmmm. Wouldn't it just suck air into the sphere? T
Re: [Vo]:Can a Box Fly?
We see that a box can fly. But can a fly box? - Jed
Re: [Vo]:Can a Box Fly?
Jed asks: We see that a box can fly. But can a fly box? Well, my cat Zoey sez: Can I has a fly box? http://www.amazon.com/b?ie=UTF8node=3409411 I suspect a human is required to assist in the lift Regards Steven Vincent Johnson www.OrionWorks.com www.zazzle.com/orionworks
Re: [Vo]:Can a Box Fly?
On Wed, Apr 25, 2012 at 1:56 PM, Jed Rothwell jedrothw...@gmail.com wrote: We see that a box can fly. But can a fly box? It would appear so: http://www.flixya.com/files-photo/m/i/n/mindurweb-158679.jpg T
Re: [Vo]:Can a Box Fly?
Terry Blanton hohlr...@gmail.com wrote: We see that a box can fly. But can a fly box? It would appear so: http://www.flixya.com/files-photo/m/i/n/mindurweb-158679.jpg Demonstrating once again that ANYTHING can be found on the web. - Jed
Re: [Vo]:Can a Box Fly?
In reply to Terry Blanton's message of Tue, 24 Apr 2012 15:06:58 -0400: Hi, [snip] This one does by turning inside out: http://www.newscientist.com/blogs/nstv/2012/04/flying-object-propels-itself-by-flipping-inside-out.html?cmpid=NLC|NSNS|2012-2304-GLOBAL|flyingobjectsutm_medium=NLCutm_source=NSNSutm_content=flyingobjects http://goo.gl/p2NdK Is that an iPhone controller? Nice background music, too. T It reminds me of the way a jelly-fish swims. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
RE: [Vo]:Can a Box Fly?
From Terry This one does by turning inside out: http://www.newscientist.com/blogs/nstv/2012/04/flying-object-propels- itself-by-flipping-inside-out.html?cmpid=NLC|NSNS|2012-2304- GLOBAL|flyingobjectsutm_medium=NLCutm_source=NSNSutm_content=flyingo bjects http://goo.gl/p2NdK Kewel! I passed it on. Regards, Steven Vincent Johnson www.OrionWorks.com www.zazzle.com/orionworks
Re: [Vo]:Can a Box Fly?
...but now I can't think outside of the box. ;) Harry On Tue, Apr 24, 2012 at 3:06 PM, Terry Blanton hohlr...@gmail.com wrote: This one does by turning inside out: http://www.newscientist.com/blogs/nstv/2012/04/flying-object-propels-itself-by-flipping-inside-out.html?cmpid=NLC|NSNS|2012-2304-GLOBAL|flyingobjectsutm_medium=NLCutm_source=NSNSutm_content=flyingobjects http://goo.gl/p2NdK Is that an iPhone controller? Nice background music, too. T
