During our cruise of the summer of 2017, we had a small mishap with the genoa sheet. The latter, tapping on the low-strut, was opened during a tack. In addition, we were pulling edges to get out of the channel of St-Malo, and the shackles opened at the narrowest point of the channel, and there was force 5. In short, I had to drop the genoa to connect the sheet to the genoa, and thus to leave again. Fortunately, it was an detachable forestay, so easy to slump!
Why a textile shackle
Since this incident, the idea of moving to a textile shackle has emerged :
- It is not likely to open by tapping on the lower stay
- It’s lighter than stainless steel
- If we take it in the figure, it will do less damage
- This will not cause damage on the bridge
- It’s fashionable !
Firstly, the breaking load of the shackle is calculated. For genoa plays, we multiply the surface of the genoa by 80.
So for our genoa, this corresponds to: 36 * 80, or 2880 DaN.
The breaking load of the braid Dyneema diameter 6mm being 2840 DaN, I chose to take the 8mm, which is equivalent to more than 3 tons! We are wide!
To summarize, for this shackle textile, it is necessary to buy 1 meter of braided Dyneema, in diameter 8mm.
For the implementation itself, there are many video tutorials on the Internet. I used this one which is well explained :
And here is the result step by step:
Finally, the hardest thing is to make the bosco whistle knot. It’s your turn !