For the record, here is a link to the book
"Self-Steering for Sailing Craft" by John S Letcher jr
The approach is 1960s era, before the domination of vane steering by servo-pendulum gears.
But it remains the only full discussion, as far as I'm aware, of the tricks and physics of making a boat go in a straight line by sail control alone, and the ideas and observations in it are still valid.
https://jesterchallenge.files.wordp...-sailing-craft-by-john-s-letcher-jr-small.pdf
"Self-Steering for Sailing Craft" by John S Letcher jr
The approach is 1960s era, before the domination of vane steering by servo-pendulum gears.
But it remains the only full discussion, as far as I'm aware, of the tricks and physics of making a boat go in a straight line by sail control alone, and the ideas and observations in it are still valid.
https://jesterchallenge.files.wordp...-sailing-craft-by-john-s-letcher-jr-small.pdf