Kite network lattices have previously been described as potentially being a metamaterial.
I think under this definition…
It’s wrong.
Yes the tensile isolattice network which may exist underneath a kite network (inside the tensile volume) can be a metamaterial, the network itself (which includes kites not just dyneema) will not be a metamaterial.
Massimo does not invoke kites in his tweet about Metamaterials.
Any periodic kite rig is an engineered metamaterial under these criteria-
made of repeating units in an ordered lattice (kite trains, meshes, etc.)
not dependent on specific substrate substance
processes physical forces in specific useful ways
This general kite-domain definition encompasses both trivial cases and exceptions. For example, woven sailcloth is a metamaterial, but membrane sail material is not, simply due to ontological approximation. The distinction of what is ordered (crystalline) and disordered (amorphous) material is often blurry, and the Old Forum has long taken on clarifications.
Fun Fact- Metamaterial Theory and 3D Printing originated in Austin, along with kPower. The world has not changed much, yet…
No of course Massimo (Rainmaker1973) doesn’t invoke kites… He invokes a dictionary.
The invoking of the idea… kite arrays are all metamaterials… came from 1 poster on the yahoo awes forum.
Asking Google
metamaterial
/ˈmɛtəməˌtɪərɪəl/
noun
PHYSICS
“the team began making these metamaterials and demonstrated several that scattered electromagnetic waves unlike any known materials”
Ok fair enough a composite is allowed in this definition… But there is nothing so fancy pants about a rope lattice in tension which can’t be seen in spider webs, jelly fish and trees… Natural stuff.
So in this definition… None of it is a metamaterial.
Don’t let semantics
https://www.google.com/search?q=semantics
bother you…
Network Kites are super cool without being metamaterial
KiteMatter, as a metamaterial domain, intends to power civilization, a property not hoped for of “spider webs, jelly fish and trees”. Our “rag and string” kite physics is as wildly exotic as anything else in the universe. Don’t let superficial familiarity introduce bias. The greatest physicists all saw the extraordinary in the ordinary. At least we have identified metamaterial auxetic and negative-refraction effects for KiteMatter, on the Old Forum, no matter who was bored.
We are the authorities to work this all out, since no one else is. We can even identify metamaterial properties in standard brush-topology kite farms. Now that biomimetics has informed metamaterial science, its a much richer engineering paradigm.
KiteMatter is the metamaterial interpretation of kites and parts either by units or ordered networks. In the loosest case, all kites in the world constitute a metamaterial; more factual than worrying no metamaterial is possible.
The frontier is a grand buffet of metamaterial aeroelasticity, social network metamateriality, formal quasi-crystallography, etc…
Ok. We differ on opinion of what science is too.
I think we should split (or delete) the last few posts where the now seemingly contentious topic of metamaterial is introduced
Its Ok for our definitions to differ, and for AWE to advance metamaterial engineering science scope and understanding. Its definitely been a core paradigm to kite network design in the last five years. Science advances by differing rather than deleting.
The “Massimo” “definition” was a bit confusing, not just because it was some other Massimo than our Ippolito, but because the definition of metamaterial is in healthy flux. Its now fully accepted to identify and study natural metamaterials, even though the initial definition of engineered metamaterials excluded them.
What was also helpful about the Harvard link is that team cites meter-scale in their macro understanding, which is moving toward our kite metamaterial kilometer-scale cells. The transforms of their paper models was cool too, but we are not ready to set up a comparable computational search of kite network space.
I am prepared to eat my words.
When wind flow meets the volume of a solid shape like a hill. If that hill is made from a porous network of kites. Yes the kite network hill steers the flow downward where the solid hill steers the flow upwards.
I’m not comfortable suggesting this is exotic in terms like a negative refractive index though.
A "hill’ made of kites is super-exotic. Be sure to follow the kite forces back upwind via the tethers to their anchors, not just the downwash. That’s highly negative refraction, with phonon particle creation. A Feynman Diagram applies.
Effectively wind and earth are our natural “particle accelerator”, just like cosmic rays serve science, and when we pop up our kites, its as exotic as CERN or maybe more so, because we are discovering a whole new branch of exotic advanced physics and engineering.
So what if there is only a handful of kite network theorists to start with. Enjoy the pristine intellectual paradise before the crowd shows up.
This has departed from topic and turned into a pop science fantasy.
The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptionscan distort how one interprets the observation. It involves formulating hypotheses, via induction, based on such observations; experimental and measurement-based testing of deductionsdrawn from the hypotheses; and refinement (or elimination) of the hypotheses based on the experimental findings. These are principles of the scientific method, as distinguished from a definitive series of steps applicable to all scientific enterprises.[1][2][3]z
You did not attribute the Scientific Method quote to WP. Here is the root article-
I am “build(ing) and organiz(ing) (kite) knowledge in the form of testable explanations and predictions about the universe”.
For example, a drogue is auxetic as it widens when pulled by wind. You can test that. Further, a meta-drogue (fractal drogue made of drogues) is an auxetic metamaterial under the cellular criterion.
The PopSci side of AWE is more like the Popular Science treatment of AWE (see old ST cover story). Thank goodness nobody censored it as such. Kite Networks has never been “pop” treatment of kite science, with its observational analysis of negative refractive index and auxetics, and topological theory.
Time for a poll
0 voters
Rod, you have by soon an important event with AWEC 2019. You don’t have time to waste on nonsense like that about MetaMaterial-Phonon-Quantum-Universe-MetaKite.
Which definition of Metamaterials are you referencing?
We should poll metamaterial scientists. Someone needs to formulate the not-a-metamaterial case. I would have already voted YES: Kite Networks are the most promising engineered metamaterial class yet conceived.
Note that Daisy Network is a Spin Field. It matters how the chiral (handed) units are arranged.
Yes Pierre, Rod only has three months before AWEC2019, and AWE conferences are no longer the place for visionary ideas to be welcomed. Maybe after the conference he can think about how kite networks cannot be metamaterials.
Luke,
Regarding the Daisy Network as a Spin Field is no longer in its intended topic.
Once again, overzealous application of moderation features is breaking apart on-topic content.
http://energykitesystems.net/Metamaterial/
Email to me any notes you suggest for the new folder. Thanks.
Mining the literature has just started.
Energetic pumping elastic lattice waves in soft media validated, analogous to theoretic AWES kitematter, like Wubbo’s SpiderMill topology. Confirmed preloading of the polymer lattice media with tension of zero-point energy, then free-energy packets can be shot ballistically over long distances. The metamaterial revolution continues-
This paper in Nature presents embodied logic such as many kite-rigging methods and theoretic kite networks offer-
Bifurcation-based embodied logic and autonomous actuation
[Yijie Jiang] [Lucia M. Korpas] [Jordan R. Raney]
Nature Communications (2019)
Some of the best presented architecture works on kite lattice networks and inflatable structures.
I’m sure there is a better thread for this post.
Some of this architecture was highlighted before
Regarding the idea that kites cannot be made of Dyneema, there is Cuben Fiber, which KiteShip experimented with-
In general, any fiber that can be spun or braided into kite line can be woven or laminated into kite cloth.
The core definition of Metamaterial is not single-material construction in itself, but structured material with properties like auxetic and negative refractive indices, even with composited variety of material.
Jim Nicholls’ 685th kite review elegantly captures kite-train lattice-wave essentials. There is no doubt such kite systems are strongly metamaterial by every formal criteria.
Happened to look at this online again today.
Still love it
I still think it could eventually become one of the best primary studies into kite network architecture.
Thought I’d bump it back into the collective AWES consciousness.