Originally Posted by c0mf0rtably
there not showing in the pic bit when me and my boss went to put the main sail up we noticed some hooks on the edge like maybe where a line should go though
you mean a leech line?
Used for tensioning the leech, to stop fluttering. Needed on some mainsails cut with a lot of roach. And for fine tuning, as the Dacron gets old and stretches.
So ... assuming that what you found are small hooks or cleats
for a leech line, there's no big deal. If the sail has a leech line installed, you'll see a thin line - say 2 or 3 mm in diameter, running as a bolt rope
in a pocket in the leech - that can be tensioned and then made to those hooks or cleats
If the leech line is missing, leaving just the bare hooks or cleats, no worry. Leech lines are for fine tuning. They do things like stop fluttering that can, over time, weaken a sail. Quite important with canvas
sails in the late 19th century, less important with Dacron sails in the 20th and 21st century.
is over-tensioning leech lines. If over tensioned, the sail will have a "hooked leech" shape, an overly closed leech shape that increases drag and lowers lift
. So if you are going to tension a leech line, the general rule
is to use the MINIMUM tension to stop the sail fluttering. If the sail is not fluttering, no need to play the leech line.
search for "leech line" should confirm whether what you saw was that. And perhaps tell you more about using a leech line.