In my tiller days, I used a sheet to tiller self-steering rig to steer my Pearson
Renegade 27 and my Westsail 32. Sheet to tiller steering
works good using the mainsail
as the windvane
to provide the power for moving the tiller.
You need the mainsail
trimmed so that there is some weather helm
. You run a line from the tensioned mainsheet through a sheave on the windward side of the yacht, and then tie the line to the tiller. You balance the pull of the line attached to the mainsheet with bungie on the opposite side of the tiller.
It works well on a beat and a reach, but not so well when running downwind. I used it a lot on my monohulls. As long as you are not sailing downwind around the world, a sheet to tiller steering
rig will do the job much of the time. Plus it is cheap
to set up.
I have read of sheet to tiller self-steering using the headsails as a windvane
, but I have never used it successfully downwind. Maybe others have had more luck.