of Multiline Control & Power Signals
There are two superposed signals on the lines of a power kite; the control
input used to steer and the power output that results. A control-bar
separates the two signals, but this is not an optimal method for most
KiteLab has a simple new method for kite control input to pass through a
surging power-lever. The attached image file (jpg format) shows the
initial "folktoy" prototype that works well.
Note the highly optimal lever set-up showing "short-stroke" downwind
displacement. A follow-on version will add a little control-bar on the
lever root, actuated by the new pulley-lines.
~Dave Santos September
The heart of it is a pulley spool spun by control lines rigged for
constant length whatever the power-lever does. Another set of lines on the
same spool run to a multi-line kite. Power strokes act on the spool axle,
which is also the power lever. A slider on the power lever allows its
leverage to be tuned to wind & kite. The power lever drives a cord around
a belt-drive generator capstan against a spring-retract (key-chain mech).
The sinusoidal power output is rectified by blocking diodes & smoothed by
a big capacitor (not shown).
The core mechanism is inspired by the Egyptian Bow-Drill & the rigging of
aircraft & tall-ship controls. Flying piloted power-kites is just one
aspect of the idea. An exciting super-simple use of this mechanism is for
an AoA control/power cycle that drives the lever in sustained
Anyone can build these things...
Comment and development of this topic will be occurring here.
All, send notes, drawings, and photographs!
Terms and aspects:
Commentary is welcome:
- Could we get a description of what the various parts do, please?