[Sailcut-users] Help on saildesign / drifter for 18ft cruiser

[Florent R. <fre...@wa...>]

Dear all,

I've got a french Beneteau First 18, a small 18 feet day cruiser; very good 
boat, except for very light airs (as it is a little bit heavy-800kg)

So, I plan to make a very big nylon headsail to play with winds strictly <4 
kn, like a big drifter or code 0 sails.
* For the sail dimensions (luff, foot & leech), I took almost the maximum 
values minus 200-300 millimetters
* For the rounds :
-1% luff
-1% leech
+ 5% feet
Is this first step correct ? I'd rather take a lower leech ?

I have measured the expected sheeting angle on my boat (around 9°) and I 
modified the twist angle to 8° to "better keep the wind", as I plan to use 
the sail only in light winds (Sailcut is initialized with an angle of 18° 
for headsails). But I'm really not sure about my correction ! For the same 
reasons, I have also modified the bottom profile with a higher deepth (2% 
changed to 5%). So now, the mold is top to bottom : 6%,8%,5%

Do you think I am the right way ?
Any comments are welcome, as I was unable to find reliable(or not) 
informations on existing litterature about this kind of sails !

Best Regards,
Florent
http://first18.over-blog.fr/