Standing rigging
Irwin 34 standing rigging
Mast top
Current rigging
SS???
Forestay and backstay 9/32 (7.14mm) 3500kg break force
15% -> 525kg (0.1-0.15% enlongation@15% and 0.2-0.25% at 30%)
Lower main shroud 1/4 (6.4..) 3220kg break force
15% -> 483kg
Other shrouds 3/16 (4.76mm) 2100kg break force
15% -> 315kg
Dyneema
Design for the main shrouds connection on the spreader
I have designed rope guide to put both bottom and top parts of the shroud on the spreader end and keep them making closed loop, also load point is located right on the bolt.
Coligo
https://www.colligomarine.com/tech-material
Excel D12 Max, Dyneema SK99
D12 Max 99 has approximately 15% - 18% higher strength than D12 Max 75 and 78 and demonstrates better creep performance than D12 Max 75, but is still bettered in this respect by
products manufactured using SK78 or DM20.
6nn - 4.07
7mm - 4.95
8mm - 6.95