On your diagram use the track labeled "unused T track" just get a sliding ring that you can attach a ratchet block to and you are done. Ideally you would install a padeye in the correct position which on a trimaran
can be tricky. Monohulls are almost never quite as wide as you would want them, a tri can be a little too wide so the typical advice of as far back and outboard
as possible doesn't quite work. The exact location depends on the sail, the boat
, and the angle of the breeze. For now just use the T track and don't stress over it.
Attaching something lower has the same effect as moving it forward, so there isn't much to be gained here by doing that.
I wanted the rig dimensions to do the following...
I - Deck
to mast head
J - Mast
to bow - 12'
So the luff length of your jib
is SqrRoot ( 43^2+12^2) = 44.6'
If you add a 5' pole it is 46.24
Now go to North Sails
Direct for their prepackaged chutes. With those luff dimensions you are looking at....
44.6 - model 42
46.24 - model 46
These are a little larger than what I had assumed. I would also recommend pricing out a tri radial from other lofts. North Direct has pretty good prices, but others lofts are also doing prepackaged sails
any may have a better cut for you.