https://windswept-and-interesting.co.uk/wp-content/uploads/2017/12/KiteNetworksWandI.pdf

Kite Networks for Harvesting Wind Energy 

by Roderick Read

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Topic thread is intended for study and discussion of points in his essay.

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Massimo,

I can agree your approach. Indeed as example Dave Lang produced only simulations before integrating the tether component into the Appolo space program.

In the way several AWE system could be studied, using artificial intelligence.

But please could you provide realistic numbers in your documents? For example a semi-rigid wing with tether cannot have a L/D ratio of 28.

Massimo,

Some quote from your paper, page 21, concerning KiteGen Research: "- Rope doubled to solve safety and piloting issues adds more drag."

Deducing a rope adds drag.

So your previous indication: "Big mistake adding tether and wing drag in KG-Carousel and KG-Stem architectures, it is a sign of poor understanding of the 3d dynamic of the flight." is the opposite of what you indicated on your paper.

I am not sure the attached Lansdord's paper is explicit about tether drag concern.

Here is another link on https://www.researchgate.net/publication/324134936_Tether_and_Bridle_Line_Drag_in_Airborne_Wind_Energy_Applications,

And here is the link for Tudelft publications on http://www.kitepower.eu/publications.html.

Massimo,

These explains are very interesting and new for me. So I cannot still fully understand. A deeper study would be required. Please can you provide some references towards available documents?

"Tether drag only limits the crosswind motion distance that can be achieved in one stroke, before the wing has to change direction."

So for example could we deduce that straight transversal strokes left-right (or top-bottom) like this https://www.youtube.com/watch?v=b1xKZuah7Z4 would allow eliminate tether drag (between two half-turns) more than figure-eight or loops? Or figure-eight and loops can be achieved with little tether drag if the wing moves with its tether, and not relatively to the tether?

Massimo,

I don't know what happened from the "early collaboration KiteGen-Delft 2003". Some other players claim also to be the inventor of the pumping kite. But the suggested technical means can be different. Only the technical aspect interests me.

So I have a question concerning your recent message I just introduced on https://forum.awesystems.info/t/kitegen-research-high-altitude-wind-generation/331/12.

Your pumping kite uses two tethers while Delft pumping kite uses only one tether. By the explain you provide, quoting Gustav Eiffel ("As Gustav Eiffel taught us, the Reynold number of the segment of rope near the wing reaches a high value where a new effect called the “drag crisis” takes place, greatly reducing it.") is the drag of the two tethers KiteGen pumping kite lower than the drag of the single tether Delft pumping kite?

I know your video but I don't still know what we should observe in regard to your explains. Thanks.