Load / Elongation curves: Sheets and Halyards

Load / Elongation curves of “used” Sheets and Halyards.
“Used“ means after average usage under normal weather conditions and is simulated in the lab with 10 loadings at 20% of the break load.

 

Sail area to rope diameter comparison chart

(scroll horizontal)

Rope type/
Sail area
[m²]

     10          20          30          40          50          60          70          80          90          100          125          150          175          200          220          250     
RunnerTwin 4–5 5–8 6–10 8–10  10–12 10–12 10–14 12–14 12–16 12–16 14–18 16–20 18–22 18–22 20–24 22–26
MegaTwin T4 4–5 6–8 8–10 10–12 10–12  10–14  10–14  12–16  12–16  12–18  14–20  16–20  18–22  18–24     
MegaTwin Dyneema® HS 3–4  4–5  4–6  5–8  6–8  6–8  6–10 8–10  8–12  8–12  8–12 10–14  10–14  12–16  12–16  14–18 
MegaTwin Dyneema® 4–5  5–8  6–10  8–10  10–12  10–12  10–14  12–14  12–16  12–16 14–18  16–20  18–22  18–22  20–24  22–26 
MegaTwin Vectran® 4–6  6–8  8–10  10–12  10–12  10–14  12–16  12–16  14–16  14–16  16–20  18–22  18–22  20–24  20–26  22–28 
TaperTwin 4–6  6–8  6–10  8–12  8–12  10–12  12–14  12–14  12–16  12–16  10–16  14–16  16       
Discover 3–6  5–8  6–10  8–12  8–12 10–12                     
DynaOne® HS® 4–5  5–6  5–8  6–8  6–8  8–10  8–10  10–12  10–12 10–12  10–12  12–14  12–14 14–16  14–18 
DynaOne® 4–5  4–5  5–8  6–8  8–10  8–10  8–10  10–12  10–12  10–12  12–14  14–16  14–16  16–18  16–18  16–20 
Dyna Lite 6–8  8–10 10–12  10–12  12–14  12–14  12–16  14–16  14–16  14–16             
Cup 6–8  8–10  10–14  10–14  12–16  14–18  14–18  16–18  16–18               
Gemini X 6–8  6–10  10–12  12–16  12–16  14–18  14–18  16–20  18–22  18–22  20–24  24–28  24–32  24–32  26–36   
Tasmania 6–8  10–12 10–14  12–16  14–18  14–20  16–20  16–20                 
Harkon 6–8  8–10  12–14  12–16  12–16  14–16  14–16  14–16                 
Standard 8–10  10–14  12–16  12–16  12–16   12–16                    

 Our recommendations originate from a combination of calculations, comprehensive tests and customer feedback. They should be used as guidelines, as rope sizes can also be determined by personal preferences and the individual technical requirements of a specific application. The following formula applies: Sail surface (in m²) x wind velocity² (in knots) x 0.021 = power (in daN) x 5 = breaking load Sail suface: P X E /2 or I x J /2

 

Spliced versus knotted rope break strength

(scroll horizontal) 

  Spliced Knoted break load
Rope typeØ mmBreak load
[daN]
Max loss break load 
[daN]
Bowline 
[daN]
Timber hitch
[daN]

Figure eight knot
[daN]

Gemini X 16 6.500  -39%  4.000  4.575  4.400 
Tasmania 12 2.900   -40%  1.750  2.650  1.925 
Cup 12  3.200   -39%  1.950  2.300  2.150 
MegaTwin Dyneema® 16  12.000   -56%  5.250  7.650  5.875 
Dyna Lite 16  9.500  -62%  3.575  6.800  4.650 
MegaTwin Vectran® 16  9.700   -67%  3.250  6.725  4.175 
DynaOne® 16 20.500   -78%  4.500  6.515  6.450 
DynaOne® 10  8.500   -72%  2.375  4.025  2.850 
DynaOne® 6  2.700  -67%  890  1.630  1.340 

Professionelly executed splices are the most efficient end terminations of ropes. They ensure that a high degree of the linear break load of a rope can be achieved in use. Knots can reduce the linear break load by more than 50%.