Have a question regarding sail size, picked up a couple of sails, a jib and genoa for a smaller boat, and was curious to see what the drawbacks to putting a two foot tail on them to raise them up off the deck a bit that would bring them very close to the required length. these sails are shorter than the proper sails for my boat (masthead), but pretty much the same size as the 7/8 rig version of my boat, my main is 31.5x13.5, the 7/8 rig is 33x13, my boat calls for a 36x10 jib, and the smaller sail is 28.5x10, the 7/8 rig calls for 30x9.8 , the sails are in excellent shape, and I picked them up cheap, so I'd like to use them if possible. larger sail is 30x17, possibly too large a foot with that size difference, what drawbacks could I expect if any? any way to determine if there will be a problem without hooking them up and sailing? Thanks ken.
jib genoa questions
- Thread starter kendall
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Sure
Attaching the tack of the sail with a pennant is done all the time. Gets the sail off the deck and up into the wind where it can work. And you gain the visibility. Run it up once, and measure how long it will have to be. Any loft can attach one in a few minutes.
Attaching the tack of the sail with a pennant is done all the time. Gets the sail off the deck and up into the wind where it can work. And you gain the visibility. Run it up once, and measure how long it will have to be. Any loft can attach one in a few minutes.
Put the 'pendants' at the TOP of the sail(s)
If you raise a genoa/jib up off the deck you lose 'endplate' effect that prevents air on the high pressure side to cross over the foot to the low pressure side. The result will be a very poor performing sail that is already much smaller than what the designer intended. If you need to see through the sail(s) have a window installed. Put the pendant on the TOP between the sail and the top swivel of a furler.
If you raise a genoa/jib up off the deck you lose 'endplate' effect that prevents air on the high pressure side to cross over the foot to the low pressure side. The result will be a very poor performing sail that is already much smaller than what the designer intended. If you need to see through the sail(s) have a window installed. Put the pendant on the TOP between the sail and the top swivel of a furler.
Halyard Wrap
The angle between the halyard and the forstay should be at a certain angle as specified by the furler manufacturer. As an example, for a Hood Seafurl this requirement would be between 15º and 30º. Angles outside this range can cause halyard wrap or perhaps premature failure of some furler component such as the swivel. For this reason all the head locations on a particular boat should be fairly close to the same location. Check your furler specs and see if they say anything about a halyard angle requirement. The tack doesn't have this problem because the load is always parallel to the furler foil. Another consideration, something to think of when looking at other sails than ones made four YOUR boat, is the sheet lead. When the sail is properly trimmed for both light and heavy air the genoa car should be within the range of the genoa track. If it isn't then obviously the sail can't be properly trimmed for those conditions. Under normal circumstances when one orders another sail the sailmaker will take the situation into considerations when coming up with a sail design. Since you're apparently doing this then it's up to you to think of all the posibilities. After all this, also check the sheet lead to see if it's still within range of your genoa track for both light and heavy air conditions.
The angle between the halyard and the forstay should be at a certain angle as specified by the furler manufacturer. As an example, for a Hood Seafurl this requirement would be between 15º and 30º. Angles outside this range can cause halyard wrap or perhaps premature failure of some furler component such as the swivel. For this reason all the head locations on a particular boat should be fairly close to the same location. Check your furler specs and see if they say anything about a halyard angle requirement. The tack doesn't have this problem because the load is always parallel to the furler foil. Another consideration, something to think of when looking at other sails than ones made four YOUR boat, is the sheet lead. When the sail is properly trimmed for both light and heavy air the genoa car should be within the range of the genoa track. If it isn't then obviously the sail can't be properly trimmed for those conditions. Under normal circumstances when one orders another sail the sailmaker will take the situation into considerations when coming up with a sail design. Since you're apparently doing this then it's up to you to think of all the posibilities. After all this, also check the sheet lead to see if it's still within range of your genoa track for both light and heavy air conditions.
Disagree
You want to get that small jib as high up as you can - the end plate effect will be relatively negligable and only applies when sailing close to the wind anyway. The higher the sail, the more wind it will catch and more than make up for any endplate losses. You'll get spoiled by the great visibility. John makes good points about sheeting angles - that big jib will probably sheet properly to a point 5 feet aft of your stern, and the smaller one might not sheet well either, but give it a try - what have you got to lose?
You want to get that small jib as high up as you can - the end plate effect will be relatively negligable and only applies when sailing close to the wind anyway. The higher the sail, the more wind it will catch and more than make up for any endplate losses. You'll get spoiled by the great visibility. John makes good points about sheeting angles - that big jib will probably sheet properly to a point 5 feet aft of your stern, and the smaller one might not sheet well either, but give it a try - what have you got to lose?
jib genoa
Cool! thanks for the replies, been wondering about that since I picked them up, wasn't too sure if it would hurt, but the cost was very low, and the sails very good, so figure even if they don't work as needed I'm sure I can make my money back on them. It's not a rioller furler, just a regular hank on, but I'd been told I wanted something between 36 and 33 feet long, started looking at the other versions of my boat (7/8 and yawl rigs), and noticed they have pretty much identical mains, with a smaller jib than mine calls for. Hopefully the larger one will work ok, probably wouldn't need the spinnaker if I can run that one. Thanks guys Ken
Cool! thanks for the replies, been wondering about that since I picked them up, wasn't too sure if it would hurt, but the cost was very low, and the sails very good, so figure even if they don't work as needed I'm sure I can make my money back on them. It's not a rioller furler, just a regular hank on, but I'd been told I wanted something between 36 and 33 feet long, started looking at the other versions of my boat (7/8 and yawl rigs), and noticed they have pretty much identical mains, with a smaller jib than mine calls for. Hopefully the larger one will work ok, probably wouldn't need the spinnaker if I can run that one. Thanks guys Ken
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