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Thecobra-System
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Bracing kangaroo Grounds
Bracing kangaroo Grounds

cobra is a dynamic tree support system specially designed
to be flexible and shock-absorbing. The system was conceived
in response to functional insights and scientific research
results. Based on these findings, the cobra system has been perfected for successful use, down to the smallest detail.

Developed with practical scientific support for practical use, cobra has contributed to preserving valuable trees inexpensively and safely. Precise knowledge of a tree's vital needs played a decisive role in design of the system. If the tree is to strengthen itself, a shock-absorbing unit, which can be integrated with a cable, will support compensating growth by means of a defined, low-resistance oscillation. But even without the shock absorber, the system is fully functional and flexible enough to absorb and reduce impacts caused by oscillation. Scientific control studies have shown the longevity of the cobra system. Its strength decrease (under 2% per year) is recognized as acceptable by scientists in the field. As a result, the system, if installed according to specifications, should not require replacement for at least twelve years. Although the cobra system consists of a number of separate parts, according to ZTV Baumpflege (German tree care standards), it is considered a single- component system because the traction is provided by a single, uninterrupted component.

The cobraVariants - Assembly

The cobra crown stabilization system has been designed for uncomplicated and safe use, which simplifies work procedures.

cobraplus 2 t
Material: Monofilament polypropylene hollow cable, Ø 14 mm, tensile strength 3.45 metric tons*,
ductile yield 7.5 % per metric ton
Creep behavior in tensile strength: Strength decrease in the range of < 2 % per year
Application:
a) As dynamic breaking-bracing system for branches up to Ø 40 cm
b) As load-bracing system for branches up to Ø 30 cm
(according to ZTV Baumpflege = German tree care standard)
Useful life: 15 years

cobra plus 4 t
Material: Monofilament polypropylene hollow cable, Ø 22 mm; tensile strength 6.1 metric tons*;ductile yield 4.2% per metric ton
Creep behavior in tensile strength: Strength decrease in the range of < 2 % per year
Application:
a) As dynamic breaking-bracing system for branches from Ø 40 to 60 cm
b) As static breaking-bracing system for branches up to Ø 40 cm
c) As load-bracing system for branches from Ø 30 to 40 cm.(according to ZTV Baumpflege = German tree care standard)
Connecting crown with close surrounding trees
Useful life: 15 years

cobra 8 t
Material: Monofilament polypropylene hollow cable, Ø 28 mm; tensile strength 11.35 metric tons*;
ductile yield 2% per metric ton
Creep behavior in tensile strength: Strength decrease in the range of < 2 % per year
Application:
a) As dynamic breaking-bracing system for branches from Ø 60 to 80 cm
b) As static breaking-bracing system for branches from Ø 40 to 60 cm
c) As load-bracing system for branches from Ø 40 to 60 cm.
(according to ZTV Baumpflege = German tree care standard)
Useful life: 8 years

cobraultrastatic
Material: Dyneema hollow cable; Ø 10 mm; tensile strength 9 metric tons**; ductile yield
0.2% per metric ton
Special braid for quick splicing
Application:
a) As static breaking-bracing system for branches up to Ø 40 cm
b) As load-bracing system for branches from Ø 30 to 40 cm
8 times lighter than steel
* Important because crown stabilization is not the tensile strength of the individual components but instead is the carrying
capacity of the system as a whole. Any redirection of rope leads to a decrease in strength. With Cobra, neither quick splice
nor tension loop results in loss of cable strength.
** The collapse load is not the important factor with the use of Cobra Ultrastatic. Instead, it is the restraint of movement; as
a result, the emphasis is on the lowest possible amount of cable stretching.