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Sunfish Sail: Leech Cupping issue

kmisegades

Swamp Goose
I have been sailing this year with a new 'Sunfish Sail, White, 10016' from Sunfish Direct. The quality is good but the leech has a permanent cup/hook to it that I have not been able to eliminate through rigging and re-rigging. If I think of the cross-sectional airfoil this creates it is akin to an airplane wing with the final 10% acting as a flap at 45 degrees down, which can not be efficient. Is this a defect in the sail, due to poor rigging (by me) or the way things are intended? I have looked at previous posting which only confuse me, but I am a guppy when it comes to the SF. Thanks for pointing me to a previous posting on what this is all about.
 

beldar boathead

Well-Known Member
Unless someone has experience with an SFD sail it’s hard to say. They could be poorly cut or it could be something to do with the rigging. I saw one SFD sail with a leech line which just seemed weird. I only have experience with authentic Sunfish sails. I do know Intensity makes a knockoff people like.
Since you are so focused on performance, you should probably get an authentic racing sail or as a backup an Intensity.
 

Wavedancer

Upside down?
Staff member
Is this a non-legal race sail, bought from Sunfish Direct?

 

Alan Glos

Active Member
All Sunfish sails have some degree of "cup" at the leach as the sail lacks battens and needs a slightly tight leach to keep the leach from flapping. However, if you think the cupping is excessive, contact Sunfish Direct and see if you can return it...then buy an Intensity - better value and better design (and no, I have no affiliation with Intensity - I just like their sails.)

Alan Glos
Cazenovia, NY
 
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kmisegades

Swamp Goose
Thank you for the good replies. My old SF came with an older silk-like sail with no cupped leech/leach. And it was stable, but looked more like a quilt than a sail with numerous patches. The overall quality of my new bargain SFD sail is good, but I do not have the experience to judge it compared to other manufacturers. For general recreational sailing I can recommend the sail.
 

L&VW

Well-Known Member
I have been sailing this year with a new 'Sunfish Sail, White, 10016' from Sunfish Direct. The quality is good but the leech has a permanent cup/hook to it that I have not been able to eliminate through rigging and re-rigging. If I think of the cross-sectional airfoil this creates it is akin to an airplane wing with the final 10% acting as a flap at 45 degrees down, which can not be efficient. Is this a defect in the sail, due to poor rigging (by me) or the way things are intended? I have looked at previous posting which only confuse me, but I am a guppy when it comes to the SF. Thanks for pointing me to a previous posting on what this is all about.
What happens if you slacken the outhauls?

Or add a sail-attachment ring at head and clew?
 

signal charlie

Well-Known Member
Staff member
I mean, it's got to have some cup or "draft," race and rec sails nowadays are cut fuller. Got any pics?

Here's a 2018 Laser Performance sail

IMG_6449 2.jpg
 

L&VW

Well-Known Member
The "proper" new sail has three "battens". :oops:

I have one sail with one "batten". :rolleyes:

That batten is all fabric, but its intended purpose is to hold the leech flatter. I don't think anyone would notice if you added a few. ;)

Fullscreen capture 1192019 71744 PM.bmp.jpg
 
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