|July 28, 2009
For public-domain AWE:
Passive Dutch-roll power cycle
Attached is a mpg showing how a naturally dancing/unsteady kite (tailless
Eddy-Malay) under a stable lifter (tailed delta) can be made to provide
passive Dutch-roll power cycle. (note crosswind sweep & large horizontal
motion of the lower line).
Unhappy with the spiral waves that develop with centrally run
Eddy-kite-train line, Eddy put each kite on a sub tether for his trains so
that unsteadiness canceled. The Eddy kite's "defect" is that its tail spar
is a regular pendulum giving it a characteristic dance. Here the
defect is effectively harnessed to regulate a crosswind sweep cycle.
Better demo video soon. In the second experiment a driven string A-frame
Many kites can be made to do passive eights with a lifter holding them up.
So far no crashes or other mishaps. A rare single loop caused no perceptible
difference in the power cycle; swivels are possibly unneeded.
This is the fifth major KiteLab "passive control"
scheme to work well & the simplest yet.
~~~~ Dave Santos