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Mega-scale Soft Kinetic-Kite AWES

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Nov. 2, 2019                     Dave Santos

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Mega-scale Soft Kinetic-Kite

The kinetic-kite is currently just a cool toy, a stick-kite that cannot scale well past ~10m spars, Both JimN and I confirm that its surprisingly powerful when the wind gets up. A vast soft kinetic-kite could be a GW unit-plant idea. The stingray is uncommonly good at swimming or resting along the bottom. kPower is preparing kinetic kite to operate by a shortline PTO network to the surface, as a scale model. While the stingray drives itself, the kinetic kite is driven.

We know these "motor-gen" dynamics well, that inputting or extracting power around a neutral pumping frequency are nearby states; inputting power is "just ahead of the beat", extracting is "just behind the beat". Every bike rider knows the feeling of coasting or pedaling along in alternation in hills, or jogging the pedals instead of rotary pedalling. Its the same relation for kinetic-kite PTO networks, and the bike's freewheel mechanism is what each PTO line needs to contribute kinetic energy to the surface work. The stingray works the same way. If a stingray body is passively towed, it will act as a kinetic kite.

A starting concept design for a mega-kinetic-kite is a round canopy composed of kixels (membrane-units at individual max handling scale, hanked onto the rope network) over an anchor-field. The center might be an inflated dome, approximating stingray volumetic geometry, or even a hole, as the action is along the margins. Whichever way the wind blows, the windward lip is flown from the anchor-field as a playsail. A small plunging pitch oscillation would develop in-parallel with anionic edge waves along the margins that would amplify as they travel aft. The common flag concentrates its forces at its trailing edge with such energetic flogging that no material has long withstood. The aft margin PTOs would be a source of super-powerful high-speed load motion.

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Good video of a round ray swimming close to the bottom, with lateral phase shifts to turn. The kinetic kite's asymmetric phasing is suggested.

Stock Video of Bluespotted ribbontail stingray (Taeniura lymma) swimming over sandy sea bottom. 4K ultra hd 2160p video footage at Adobe Stock


Nov. 1, 2019                          Dave Santos

Mega-scale Soft Kinetic-Kite AWES

The kinetic-kite is currently just a cool toy stick-kite that cannot scale well past ~10m spars, Both JimN and kPower confirm that its surprisingly powerful when the wind gets up, like holding a panicked goose. A vast soft kinetic-kite could be a GW unit-plant idea. kPower is preparing kinetic kite to operate by a shortline PTO network to the surface, as a scale model.

While the stingray drives itself, the kinetic kite is driven. We know such "motor-gen" dynamics well, that inputting or extracting power around a neutral pumping frequency are adjacent states; inputting power is "just ahead of the beat", extracting is "just behind the beat". Every bike rider knows the feeling of coasting or pedaling along in alternation in hills, or jogging the pedals instead of rotary pedalling. Its the same relation for kinetic-kite PTO networks, and the bike's freewheel mechanism is what each PTO line needs to contribute kinetic energy to the surface work.

The stingray is uncommonly good at swimming or resting along the bottom. A starting concept design for a mega-kinetic-kite is a round canopy composed of kixels (membrane-units at individual max handling scale, hanked onto the rope network) over an anchor-field. The center might be a ram-inflated dome, approximating stingray volumetic geometry, or even a hole, as the primary action is along the margins. Whichever way the wind blows, the windward lip is flown from the anchor-field as a playsail. A small plunging pitch oscillation at the nose would develop in-parallel with anionic edge waves along the margins will amplify as they travel aft, just as the common flag concentrates its forces at its trailing edge with such energetic flogging that no material has long withstood. The aft margin PTOs would be a source of super-powerful high-speed load motion.

If a stingray body is passively towed, it will act as a kinetic kite. We see that both stingray and kinetic-kite bodies are cultivating and growing vortices that develop maximum vortex-lift power as they are shed aft. Lets see how kPower's PTO-rigged crankshaft driving kinetic-kite works out. Reverse-driven on small wheels, it should swim itself along the floor. Getting soft kite margins to develop strong anyonic waves will be another fun challenge.

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