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The basic idea is quite simple: think to a ball bearing,
if one of the lines passes through the hole, while the other one is cut
and the ends obtained in this way are connected to the bearing, you will
have something like the figure on the left.
Now we can imagine that the upper wivel follow the kite
during its turning, so after a complete revolution the kite will be in
the same condition as before. The control on the kite is manteined since
the wires can flow independently one from each other. To have something
working from this idea, we had to face several problems: the bearing axis
must stay alined with lines direction, the twisting power is low, the joint
must be light, you would like to extricate the wires although they are
interlaced from start...
All these problems were solved, the result is the device
showed in the section on the right; its heart is the collar thrust, wich
endure the force on the blue wire, while the red one can run through the
tube. Although this could seem simple, this joint uses some "invisible"
soluctions that are necessary for it to correctly work.
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