Airloom’s Whacky Wind Clothesline Turbine Idea

November 26, 2023 by Maya Posch 53 Comments

What if you don’t put airfoils on a central, spinning axis, but instead have them careen around a circular track? If you’re a company called Airloom, you’d say that it’s a very cheap, very efficient and highly desirable way to install wind-based generators that can do away with those unsightly and massive 100+ meter tall wind turbines, whether on- or offshore. Although grand claims are made, and venture capital firms have poured in some money, hard data is tough to find on their exact design, or the operating details of their one and only claimed kW-level prototype.

Transpower's 'flying clothesline' wind turbine setup. — Transpower’s ‘flying clothesline’ wind turbine setup.

Despite the claims made by Airloom, they’re not the first to have this idea, with Transpower in the 1980s making itself famous with their ‘flying clothesline’ that featured a continuous loop of sails tensioned between two ropes. These ran around a pole on either end with each having a generator for a claimed total of 200 kW. Ultimately Transpower seems to have gone under along with many other wind power pioneers of the era as they couldn’t make their idea economically feasible. Something which is a definite trend in the field.

Some parts about Airloom’s design are definitely concerning, with the available images showing each airfoil running along a central rail on a number of wheels and with their ‘Power Takeoff’ (i.e. generator) not defined in any meaningful manner. Here is where [Robert Murray-Smith] had a bit of fun in a recent video, creating his own dual-chain version that somewhat resembles a mixture between the Transpower and Airloom designs. He also put the design up on Thingiverse for others to 3D print and tinker with, requiring a handful of bearings for smooth running.

For the power takeoff, [Robert] suggests that in his design the cogs around which the chain moves could be attached to a generator (like in the Transpower design), but he could see no indication of how Airloom intends to do this. Feel free to put your own speculations in the comments. And if you’re from Airloom, show us the details!

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Agate Light Twinkles Just Right

November 23, 2023 by Kristina Panos 3 Comments

Mother Nature is often a cruel mistress, but what can you do? You’ve got to make the best of what she gives you. This lovely little light was born from death — the death of a pine tree, that is, that was killed by beetles boring large holes inside.

When [Craig Lindley]’s friends gave him some slices of that pine tree, he knew he had to make a blinkenlights thing out of it. The next step was to procure slices of agate, and from the top of Pike’s Peak, no less.

Each slice of agate has three RGB LEDs behind it, and these are controlled by an ESP32. There’s also a PIR sensor that detects people and gives them a show. More specifically, it runs through several patterns at random speeds up and down the piece.

The agate slices are embedded in the wood, which [Craig] achieved first with a Dremel, and then with a router when the Dremel proved difficult. After some troubles with resin and an unfortunate mishap with a rag, [Craig] ended up with a beautiful light with which to dazzle his friends, especially the ones who gave him the pine slice.

You know we love blinkenlights; you see them here all the time. Did you know you can use them to keep time?

Underwater Kites Buoying The Prospect Of More Tidal Power Generation

November 15, 2023 by Maya Posch 7 Comments

Swedish start-up Minesto has been for years trying to float the idea of having underwater turbines that generate power for use on-shore. These would be anchored to the seafloor by a long tether and move around in figure-of-eight patterns like a kite, which would increase the flow over the turbine’s blades. After a few years of trials, its 1.2 MW Dragon 12 kite will now be installed off the coast of the Faroe Islands.

Previously, Minesto had installed its much smaller DG500 (0.5 MW) kite turbine at Holyhead Deep, in Wales, where a single unit has been tested at a depth of between 65 and 91 meters. So far, only this unit has seen continuous operation. As noted in the linked Tethys report, this one unit was not connected to the grid, and research on its environmental impact is still ongoing as of September 2022. The main concerns are how it might affect cetaceans (whales, dolphins, etc.), including potential collisions with these as well as diving birds who might end up diving in the midst of a swarm of kites moving about at fairly high speeds.

One of the proposed Minesto Dragon 12 kite array installation sites at the Faroe Islands. (Credit: Minesto)

Although by itself putting a turbine into the much stronger and energetic ocean currents – not to mention near-continuous – makes sense, the marine environment is a tough one to survive. The DG500 prototype has seen a few years of use, but this would be the first large-scale deployment of such a system and thus the first significant long-term durability test. The goal at the Faroe Islands is to install 120 MW of capacity, across four kite groups, joining the smaller Dragon 4 (0.4 MW) unit that was grid-connected in May of last year.

Depending on the results, including the economics, this technology could prove to be either much better and cheaper than off-shore wind turbines, or turn out to be saddled with fundamental flaws that has plagued previous attempts to make use of the strong currents and tides that make the world’s oceans and seas into one of Nature’s most impressive sights.

Hack A Soda Can Into Jewelry

November 9, 2023 by Al Williams 11 Comments

If you’ve ever needed some aluminum for a project, you might have noticed you have easy access to aluminum cans. If you need a cylinder, fine. But what if you don’t? [ThescientistformerlyknownasNaegeli] shows how to create an attractive necklace from two soda cans, and we think the techniques might be usable for other cases where you might need aluminum. If you care more about the necklace, it looks good. You only have to add a 3D-printed clasp or, if you prefer, you can buy a clasp and use that. For the Hackaday crowd, you can also use the resulting structure as an aluminum cable shield, which might better suit you.

The post gives more details and points to other posts for even deeper dives into many of the steps. But the basic idea is you strip the ink from the outside of the can and then cut the can into a strip. The mechanism for that looks a lot like a machine to cut plastic bottles into strips, but that method isn’t feasible without special blades.

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Virginia To Get Large-Scale Wind Farm

November 6, 2023 by Al Williams 89 Comments

If you go about 27 miles off the coast of Virginia, you’ll find two windmills jutting up out of the sea. Two windmills aren’t particularly interesting until you realize that these two are on the edge of a 2,100-acre lease that Dominion Energy is placing in Federal water. According to the company, those two will be joined by 176 more windmills on a nearly 113,000-acre adjacent lease. The project has been in the planning and pilot phase for a while, but it was recently given the green light by the US government. You can see a promotional video about the project below. There’s also a video of the first monopiles — the mounts for the windmills — arriving in the area.

The project will eventually have three offshore substations that feed the power to the state military reservation and, from there, to Naval Air Station Oceania, where it feeds the commercial power grid. The final project will power 660,000 homes.

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Paperless RFID Tags Are Carbon-Based

October 28, 2023 by Kristina Panos 16 Comments

RFID tags are great little pieces of technology, but unfortunately, the combination of paper, metal, and silicon means they are as bad as some modern pregnancy tests — single-use electronic devices that can’t be recycled.

A team of design program graduates from London’s Royal College of Art aim to change that. They’ve devised a mostly-paper RFID tag that’s as safe to recycle as a piece of paper with a pencil doodle on it.

The team’s startup, PulpaTronics have created a design that uses paper as its only material. The circuitry is marked on the paper with a laser set to low power, which doesn’t burn or cut the paper, but instead changes to composition to be conductive.

PulpaTronics were also able to create a chip-less RFID tag much the same way, using a pattern of concentric circles to convey information. The company estimates that these tags will reduce carbon dioxide emissions by 70%, when compared with traditional RFID tags. They’ll also cost about half as much.

RFID is used in many industries, but it’s also great for hacking. Here’s an 8-track player that harnesses the power of RFID tags to play songs off of an SD card.

Thanks for the tip, [gir.st]!

DIY Shredder Creates Insulation

October 23, 2023 by Bryan Cockfield 28 Comments

Plenty of us have experience with paper shredders, but there are all kinds of machines designed to completely destroy other materials as well, from metal and plastic, to entire cars. [Action BOX] built their own heavy-duty shredder capable of dismantling things like cell phones and other robust handheld objects, but after seeing what it would physically shred they decided to give it an actual job creating insulation for the attic space in their garage.

The shredder itself uses opposing metal plates arranged on sets of two cylinders, with each cylinder powered by it’s own large motor. In total, the entire system uses around 1.5 kW, so to make their green insulation project as green as possible they decided to power it with an equivalent amount of solar panels. For the insulation they’re using a year’s worth of boxes from various deliveries, and after a time-consuming process preparing the boxes for the shredder, shredding the strips of cardboard, and packaging it in garbage bags their efforts netted them enough to partially fill the space between four ceiling joists. Continue reading “DIY Shredder Creates Insulation” →