The Sanjo Rokkaku


This is the Rok as I build it. There are some details that differ from the "normal way to build it.
- The connector used is a drilled through standard 8 mm T as used in stunt kites: the the spar can be in one piece which is stronger than a split one.
- I use a 7 leg bridle to prevent deformation in gusts or high winds. This allows you to build the kite lighter and allows a stable flight under all conditions.

These Roks were made for the Institute for Marine and Atmospheric Research Utrecht (I.M.A.U.)
The big one is 2 meters high: the smaller one 1.5 meters. These kites have some special solutions cause they have to be assembled in -40 degrees Celsius (add some wind and you easily get a windchill over -80 degrees C): you don't want to mess around too long at that temperature without your gloves on...
That's why the vertical spar is secured with velcro (easy on easy off) the problem however were the bow strings... The solution turned out to be very simple: if you add split end caps on the horizontal spars and attach the bow line to the sail it's simply a matter of hooking the bow line in the end caps! If you hook a small piece of line with two large beads at the ends around the bowline you can even assemble it with thick gloves on.
They are flown either separate or stacked depending on the wind conditions: their purpose is to bring measuring equipment up to 2000 feet.
Both the kites and the messenger system are currently tested in Antarctica.
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