Daisy Kite Wind Turbine: Now You Can Buy One

The Isle of Lewis is the largest of the Scottish Outer Hebrides, sitting in the North Atlantic off the west coast of the Scottish mainland. It is the first landfall after thousands of miles of ocean for a continuous stream of Atlantic weather systems, so as you might imagine it is a place in which there is no shortage of wind.

It is thus the perfect situation for a wind power startup, and in the aptly-named Windswept and Interesting Ltd it has one that is pushing the boundaries. Their speciality is the generation of power from spinning kites, arrays of kites that transmit power to a ground-based generator through the rotation of their lines, and because they release their designs as open source they are of extra interest to us.

Of course, if you are a seasoned reader you’ll now be complaining that we’ve covered this story before when they had an entry in the 2014 Hackaday Prize, so what’s new? The answer is that the 2014 story was a much earlier iteration than their current multi-level kite array, and that they have now reached the point of bringing their products to market. You can buy one of their prototypes right now, and there is a soon-to-be-launched crowdfunding campaign for their latest model. It’s not exactly cheap, but this first product is the result of 5 years of product development, and it is pretty obvious that more is on the way. For any open hardware startup to stay afloat that long is an impressive achievement, to do so in a field in which you are not surrounded by a huge supporting industry in the way for example electronics startups are is nothing short of amazing.

If you would like to have a go at building one of their spinning kites, you can do so with full instructions released under a Creative Commons licence, but for non kite builders their website is a fascinating read in its own right. Their YouTube channel  in particular has a wealth of videos of previous tests as well as design iterations, and is one on which many readers will linger for a while. Below the break we’ve put one of their most recent, a montage showing the kite evolution over the years.

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Build A Circular Aerofoil Kite

[Waalcko] fell in love with kites when he was 13 years old. He saw a NASA Para Wing kite fly and couldn’t get it out of his head. Now, years later, he shares how to build a circular foil kite design he came up with.

We’re all particular about our chosen hobbies. Some of us like one design direction and hate another. For [Waalcko], he really hates internal supports in kites. When he spied a single line kite in a circular foil configuration he was enraptured, but the design had those hideous spars. So, he got to work and pushed himself to the limit coming up with a kite that was a circular foil, flew with one line, and had no internal supports.

His instructable is a great read and goes into deep detail about the basics of kite construction. (After reading it we’re certain that even the shallows have depths when it comes kites.) It goes through the terminology used when talking about kits, the techniques used to assemble them, the common problems, and more.

Many hours later, if all goes well, one should end up with a really cool kite.

Umbrella Turned Delta Kite

How many broken umbrellas have you thrown out in your life? [BigApe] has come up with a novel way to reuse them, by turning them into kites.

The beauty of the build is in the MacGyver-style material list. Apart from a few store bought 8mm aluminum and plastic tubes, the majority of the build is out of other scraps that you can easily find around the house. Spokes from a broken bicycle wheel, plastic from a CD case, elastic bands, yarn, some washers, an empty hair gel tube, the list goes on… We really have to give him credit on the creative material choices!

Now before you get too excited, this project does involve quite a bit of sewing, so a sewing machine would be quite handy. Other than that, only basic tools such as pliers, scissors, punches, matches, drill bits, and a saw, are required.

The finished product ends up being a bit heavier than most similar sized consumer-grade delta kites, but [BigApe] achieved some kite-like flight out of it in low wind speeds. He promises to post a test video when it gets a bit windier to prove his design.

On the topic of kites, earlier this year we covered a remote-controlled, autonomous, power generating kite!

A remote-controlled, autonomous kite generates power

kite

Generating power from wind is easy – just stick a windmill on a pole and attach a generator. That’s not particularly cool, though, so [Adrien] and his team from his senior design project are using an autonomously controlled kite to generate power

The basic idea of generating electricity from a kite is to fly it around in figure-eights while unwinding the kite line from a spool. The very strong forces on the kite lines can be used to drive a generator which provides power for reeling the kite back in at a lower angle of attack. You can check out [Adrien]’s kite power theory page for a few more details on how this works.

Right now, [Adrien] and his team have a basic rig set up to generate power and are flying the kite via a joystick. Updates are coming, and you can check out the video of their RC kite in action after the break.

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