CoolIP index Most recent edit: Thursday March 20, 2014 SearchSite
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Two-stage tri-tether, leveling the playing-field
A few suggestions for possible improvements to the tri-tether (multi tug tether) system.
1) To really keep things simple.
Have an even number of tethering points say 4, The 4 tethers would only be 2 lines. One run from the collected kite single line point to an x pulley through an in-line clamp (boat deck like) on the end of the crank handle to the other x pulley up to the collected kite single line point. Do the same with a line for the y axis.
If the kite can be set close to it's average traction point on the wind window lock off the clamps and start to run the looping with balanced lines. Otherwise allow active clamp adjustment as slack and tension allow based upon the ideal force implications of the traction course and cranking input.
2) In a previous video description, I suggested reasons why a system with equal length tethers split to a radius, acting in phase to turn a central crank, that the plane of kite movement on the wind window is closely aligned with the axis of the crank.
Considering solution 1) above I'm not so inclined to agree but..
Keeping with the ideals of KIS and weight on the ground, a good solution may be a two stage tri tether.
Using a single line run all the way around the ground ring, at each anchor pulley point also run an amount of the single line up through a the lower of a dual ended pulley. The standard tri tether line goes through the top pulley as normal.
What's the advantage? A single line run alternating through a ring of spread anchored pulleys and airborne tension based pulleys will rest the airborne pulleys across the plane of the tether force.
That's going to be useful if we can turn on and off the rotation of the parafoil looping under a parafoil ... or if we launch ... calculate the average tether force vector and clamp / lock off the ground based pulley points accordingly.
The L/D of the set determines the angle of the plane. Higher will be much easier to work from. Offsetting the crank axis to this angle on a rotatable/lockable central turret allows the ground set to run on auto.
3) Same as 1 above, but have the clamp adjustment on the kite side... not as light.:(
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