Vincent DePillis
Junior Member
- Joined
- Jun 5, 2023
- Messages
- 5
- Reaction score
- 3
- Location
- Seattle
Am planning a structural furler for a Corsair 31 trimaran. Swivel at the top, furler at the bottom, connected by a armare PBO torsion cable which serves as forestay, and transmits rotational force.
There wil be no way to adjust luff tension on the go with the halyard. (considered and rejected Colligo ELHF and Ubi Maior Jiber for various reasons). Head will be either lashed at the head, connected to swivel with a lock, or raised by an integral halyard tht lives in the zipper luff.
In any of these cases, there will be a lashing or tackle at the tack to tension the luff. But adjusting this tensioner as the wind rises will be difficult or impossible. Really this is a set and forget setup, and there wil inevitably be some loss of performance.
Ian wondering if I can minimize the need for adjustment by going to a “structured luff” jib, as developed by Doyle and north. This is a jib that has enough continuous fiber in the luff to share a significant part of the forestay load. Say 50 percent.
My thought is that if there is no halyard to stretch (because the head is lashed to the swivel) and the sail itself doesn’t stretch any more than the forestay, you really can’t lose luff tension relative to the forestay- and therefor would not have adjust luff tension as the wind rises and falls.
is this right?
bonus question: does anybody know what Doyle’s new “hybrid” sailcloth is? They been teasing it for a month now. Looks like some kind of spread filament deal to me, like DP’s Tyra Flex or north’s 3Di.
There wil be no way to adjust luff tension on the go with the halyard. (considered and rejected Colligo ELHF and Ubi Maior Jiber for various reasons). Head will be either lashed at the head, connected to swivel with a lock, or raised by an integral halyard tht lives in the zipper luff.
In any of these cases, there will be a lashing or tackle at the tack to tension the luff. But adjusting this tensioner as the wind rises will be difficult or impossible. Really this is a set and forget setup, and there wil inevitably be some loss of performance.
Ian wondering if I can minimize the need for adjustment by going to a “structured luff” jib, as developed by Doyle and north. This is a jib that has enough continuous fiber in the luff to share a significant part of the forestay load. Say 50 percent.
My thought is that if there is no halyard to stretch (because the head is lashed to the swivel) and the sail itself doesn’t stretch any more than the forestay, you really can’t lose luff tension relative to the forestay- and therefor would not have adjust luff tension as the wind rises and falls.
is this right?
bonus question: does anybody know what Doyle’s new “hybrid” sailcloth is? They been teasing it for a month now. Looks like some kind of spread filament deal to me, like DP’s Tyra Flex or north’s 3Di.
