There are a few
books that describe in detail how to build a
windvane self steering system.a good one is "Ocean Voyaging" by David M Parker,Bernard Moitessier also explains the fundamentals in his book"The Long Way".I think Hiscock also has some info.I have built them before,they don't look as pretty as a
Monitor,but
work just as well,and are easier to
repair.All you need is S.S. pipe for shaft with straps welded on, an inner rod for trim tab,a few fittings,some
wood for vane,a counterweight.
Rudder and trim tab are antifouled
wood, same size as main
rudder and a trim tab 1/4 the area of rudder,on pintle and gudgeon attached to rudder.Vane should be about same area as rudder.To lock vane into set position,a pulley
wheel,fan belt and highfield lever.Maybe $500. in total.