[Wiki] Pumping Yo-Yo Kites

The most commonly explored AWES method is the Pumping or Yo-Yo kite.
Tight kite line is unspooled from a drum to turn a generator on the ground.
This generates power until the kite line reaches a length limit.
Then the kite flys back to the start while the line is spooled back onto the drum.

Sub Methods

Ampyx Power
FECreate (a pure winch company)
Kite Power Solutions

Defunct companies
Guangdong High-Altitude Wind Power Technology, LTD (using umbrellas or parachutes)

Published 21/1/2019 https://www.researchgate.net/publication/320041857_Optimum_Experimental_Design_of_a_Rigid_Wing_AWE_Pumping_System
Optimum Experimental Design of a Rigid Wing AWE Pumping System
Giovanni Licitra , Adrian B ¨urger , Paul Williams , Richard Ruiterkamp and Moritz Diehl



Please edit this topic as a wiki structure

kiteKRAFT is a flygen making figure-eight, and Florian Bauer’s project. https://www.researchgate.net/project/kiteKRAFT. Florian is also an author of https://www.researchgate.net/publication/320742362_Drag_power_kite_with_very_high_lift_coefficient that is a paper discussed on the forum.

Perhaps low technologies, like Guangdong High-Altitude Wind Power Technology, LTD ’ yoyo parachute, are better for pumping yoyo kites, that due to the 4/27 Betz limit, but I am far to be sure of it.

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A passive Phugoid Mode Pumping Daisy is possible harvesting the torque waves OliverT has identified, but by wings in Phugoid oscillation. Instead of tapping torque as such, the Daisy could free-wheel, with pumping strokes tapped. Not necessarily better, except perhaps for direct pumping work, but passive Phugoid wing pumping is a novel AWES idea in itself.

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I felt oscillations by using a single wing for Low radius loop, envisaging a pumping (yoyo) mode use. Can be them assimilated to phugoid waves? And what can be the benefit of the use of phugoid oscillation in pumping mode?

There are two bulk flight pitch oscillation modes commonly known, the short-period and longer phugoid. There are a handful of other flight modes, plus internal aeroelastic modes, and they all interact. That’s the sort of power motion you felt.

The reason these modes are important is because a wing wants to fly them. That’s why figure-8/Dutch-roll is so natural to fly. Ideally in AWES these modes become resonant, passively self-sustaining, with only easy tuning and on-off trim inputs needed.