• TORSIONAL CABLES

  • CUSTOM STROPS

  • FORE & AFT CABLES

  • STANDING RIGGING

TORSIONAL CABLES

BOTTOM UP AND TOP-DOWN

The engineering department of armare has developed techniques and machinery to submit “torsional cables“ to avant-garde tests. The evaluation of the torsional static and cyclic resistance allows armare to simulate the behaviour of the cables on board, in order to improve the products and to provide useful design data.

Armare state of the art technologies for the best torque transmission

Torsional cables have been specifically designed to be used as a means of torque transmission along the cable, without loss of speed between tack and peak of the sails, for the furling of the flying or spherical sails, as gennaker. The technological development has enabled the design and realization of a wide range of structural torsional cables, which permits the application of this technology also for the winding of luffed headsails like code zero sails, drifter, solent and staysails.

 

These cables are now the best technological achievement that guarantees torque transmission along the cable, flexibility and high speed furling. This allows quick and reliable operations of the sailors, with a dramatically reduction of the time of furling. Torsional cables have now become essential on any cruising or racing boat, offering incomparable performance, higher than any other textile cable/rope.

Fibers and terminals

Standard cables are made of the same fibers used for single cables: PBO-Zylon®, or Dyneema® SK99, Dyneema® DM20, Kevlar® 49. The cables can be supplied either with a couple of terminals AT or with one terminal AT and one other specific terminal for lashings. When using a specific terminal for lashings the cable must be shorter than the sail. Then it is connected to the drum fork by a structural lashing made of Dyneema® rope of the appropriated diameter and length.


BOTTOM UP AND TOP DOWN TORSIONAL SYSTEMS

Bottom Up Systems

It is the principle of the traditional winding and is so called, because the torque transmission happens from the bottom upwards. The sail is secured with a lashing on both end of the cable; the torsional force is applied to the drum and the textile cable transmits the torque along the cable until the opposit end (at the top) and the sail begins to wrap from the bottom to the top. The bottom-up cables have the smallest possible diameter, are simple to handle and to stow, and allow the best parameters of torque transmission.

Torsional Bottom Up cables operation principles

Top-Down Systems

In this case, the tack of the sail is fixed to the drum through one free tack swivel: the torsional force applied to the drum is transmitted almost instantly to the swivel at the top and it causes the winding of the sail from the top to the bottom. When the winding is completed, the halyard can be released and the sail can be easily traversed and stowed. The cables, designed for the use with top-down winding, are effective with any kind of sail, but considering the exceptional speed of winding, are particularly suitable for sail with downwind like gennaker, without distinction between running or reaching. The use of these cables and the extraordinary easiness and fastness of winding, let to extend the range of exploitation of the sails, from downwind, also with critics wind ward. The dimensioning of this type of cables is an extremely important element, which was faced from Armare technicians during many years of tests and trials on boats of all sizes and use. For an optimum use, it is required a high torque trasmission capacity, that has to be enough to ensure the correct winding speed of the sail and higher than 100 rpm.

Torsional Top-down cables operation principles

BOTTOM UP FURLING COMPOSITE CABLES - CASE STUDIES

BOAT

CABLE

FIBER

W.L.

LENGTH

DIAMETER

WEIGHT

 

[-]

[-]

[Ton]

[mm]

[mm]

[Kg]

XC45

Code 1

Kevlar

2,5

20000

14,0

4,0

POGO 40S2

Stay sail

Kevlar

3

11500

14,5

2,7

POGO 40S3

Structural Code Cable

Kevlar

5

16500

17,5

5,0

XP44

Code Cable

Kevlar

5

19500

15,5

4,8

EDIMETRA 65'

Code Cable

Kevlar

5

29500

16,5

8,2

NAUTA 70'

Code Cable

Kevlar

5,3

22000

19,0

8,0

SOLARIS 58

Code Cable

Kevlar

7

25000

18,5

8,8

SWAN 68

Code Cable

Kevlar

7

28000

16,0

9,2

MYLIUS 18e25

Code Cable

Kevlar

7,5

26000

18,5

9,3

VISMARA 80

Code Cable

Kevlar

8

30000

19,5

11,8

POGO 50

Structural Code Cable

Kevlar

8,3

19500

20,0

8,0

CAT 30'

Code Cable

PBO

1

15000

8,0

1,0

CLASS 40

Code 0

PBO

2,5

18000

12,0

3,0

OPEN 50

Stay sail

PBO

3

12000

13,0

2,2

CLASS 40

Struct. Forestay

PBO

4,3

16000

15,0

3,72

COOKSON 50

Code Cable

PBO

5

23400

15,0

5,52

OPEN 50'

Struct. Forestay

PBO

8

18000

15,0

4,99

IMOCA 60

Code Cable Solent

PBO

10

23500

20,0

8,37

CAT 55'

Code Cable

PBO

12

18000

19,0

7,45

SWS 82

Code Cable

PBO

12

34000

19,0

12,5


All the cables can be built on specific requirements of designers,
based on parameters of breaking load (ton) or stiffness (ea).
They can be used with all modern and sophisticated furling systems and the terminals are pre-drilled to the exact size, In order to hold the pins of the furler.

TOP DOWN FURLING COMPOSITE CABLES - CASE STUDIES

J122

Top Down

Kevlar

2,5

18000

13,0

3,3

X41

Top Down

Kevlar

2,5

18500

12,0

3,0

XP44

Top Down

Kevlar

3,5

19500

14,0

4,1

X50

Top Down

Kevlar

4

23000

15,0

5,7

GS60

Top Down

Kevlar

5

24500

15,5

6,2

SOLARIS 72

Top Down

Kevlar

6,5

26000

16,0

8,9

WALLY 80'

Top Down

Kevlar

7

33500

17,0

13,2

NEO 400

Top Down

PBO

5

18500

13,0

3,5

TORSIONAL PBO CABLES

PBO CABLE

CODE

BREAKING LOAD

MAX

WORKING LOAD

DIAMETER

WEIGHT

 

[Kg]

[Kg]

[mm]

[Kg/m]

ATPB 06 

6.000

1.500

10,50

0,113

ATPB 10

10.000

2.500

12,70

0,173

ATPB 15

15.000

3.750

14,50

0,213

ATPB 20

20.000

5.000

15,60

0,248

ATPB 25

25.000

6.250

17,20

0,280

ATPB 30

30.000

7.500

18,70

0,313

ATPB 35

35.000

8.750

19,50

0,351

TORSIONAL KEVLAR CABLES

KEVLAR 49

CABLE CODE

BREAKING LOAD

MAX

WORKING LOAD

DIAMETER

WEIGHT

 

[Kg]

[Kg]

[mm]

[Kg/m]

ATK49  06

6.000

1.500

12,70

0,136

ATK49  10

10.000

2.500

14,80

0,208

ATK49  15 

15.000

3.750

16,80

0,256

ATK49  20   

20.000

5.000

18,70

0,298

ATK49  25

25.000

6.250

19,60

0,336

ATK49  30

30.000

7.500

21,20

0,376

ATK49  35

35.000

8.750

22,50

0,421