Tri-Anchor Tri-Tether AWES Unit-Cell

This topic reviews concepts based on tetrahedral tether-tripod unit-cells in AWES engineering. Tigner’s patent drawing below shows a variant, but various other cases exist, both experimental and theoretic, generally of shorter proportions. Unit-cells can also be combined into kite networks interconnected aloft. Its a very basic rigging method.

image

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https://iopscience.iop.org/article/10.1088/1742-6596/1037/4/042023/pdf

For what I see, the anchors can be largely spaced, and allow to face wind changes from three units. For what I understand (please correct me) the intermittent generation from the yoyo system is solved by an alternate move between two of the three anchors according to the wind direction.
Thanks Dave to tell more.

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You’re welcome Pierre,

The main advantage of this method is automatic crosswind load-motion cosine-gain.

The Old Forum archive documents this topic over hundreds of messages going back over ten years.

Here’s the first demo video-

http://energykitesystems.net/KiteLab/tripodtether.mpg

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Demo video does not work. Seems highly sophisticated setup to me. No commercial viability possible. I also wonder how much energy has been produce with this setup by Dave. I mean measured power, not guessed or feel by hand

I have asked Joe Faust to locate better KiteLab links. Old mpg format does not work for many folks.

The demo shows a hand crank lantern generator being driven, at about 5-10W. The more impressive power signal was how the log first used for a center anchor was spun into the beach, perhaps at about 100W.

Many early KiteLab devices are in the World Kite Museum collection. They can be studied and tested further by scholars, to provide Open-AWE third-party assessment. We should all wonder how much measured power Makani’s M600 really nets, not just KiteLab’s numerous first-try toy demos.

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The project “to YouTube” growing list of videos for KiteLab may be found at
http://www.energykitesystems.net/AirborneWindEnergy/KiteLabVideos.html

This will avoid having to download videos in format perhaps challenging to some readers.
E.g.:
tripodtether by KiteLab See also: Drawing

Some background: http://www.energykitesystems.net/CoopIP/ReturnOfTheTriTetherCrosswindNonBelay.html

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Thanks Joe, and to everyone patiently waiting for a large trove of early EnergyKiteSystems AWE documentation to be further aggregated, reformatted, and indexed.

The first tripod-tether AWES demo was 2008, which seems a lifetime ago with so much progress since. The 5-10W estimate breaks down about half to the generator and half lost to slop of the center tripod station. I am out of breath during the video because I had just launched the pilot from downwind and sprinted an excited 50m dash to catch the video before anything stopped working, to move onto the next hack.

KiteLab Group videos are only intended to document basic functioning of AWE concept after concept, not sell anything or impress anyone.

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