If you wonder how model yachts sailed before the days of radio, the answer
was: quite nicely, thank you. This was called "free
sailing" and we call tell you how it was done, including the critical
act of adjusting
and trimming the vane gears that steered free-sailing boats.
For the technically inclined, we recently obtained rare
material written by the late and legendary Gus Lassel on the art and
science of vanes and the sliding rig.