Re: spar dimensions for small lugsail?
- --- In email@example.com, "macinkos" <smacinko@...> wrote:
> I am adapting a small balanced lugsail (yard 8'6"; boom 6'2") to an
Hmmm, sailing an Auray -- sounds fun. As for scantlings, this might be
germane: I put a balanced lug on a Cartopper, and loved it! It was 64
sq ft, with a 9' yard and a 10' boom, both finished round and tapered.
The yard was about 1 3/8" at the thickest, and turned out a little
bendy for the flat-cut sail. The boom was maybe 1 1/4" at most and
worked just right. Turns out that the boom forces on a balanced lug
are much lighter than with a standard gooseneck type boom, because the
rig is inherently self-vanging. On a regular rig, most of the stress
is on the end of the boom, to pull in the upper leech and reduce
twist. With a balanced lug, this is largely done by the tension in the
downhaul and the luff (Make the luff _strong_!). If you put some round
in the head, say 1-2", you can use the downhaul to flatten the sail in
I put two reefs in, with the second reef just below the throat, and
got a faux-lateen sail of about 35 sqft for big air. Worked great!
Good luck, and post some pictures when you're done.