Why are so many other self steering systems of the servo pendulum type?
They are less expensive to build. Less moving parts and less structural strength required. The servo pendulum does not have to steer the boat – only operate the wheel/tiller. Whereas the HYDROVANE does have to steer the boat. Secondarily, it is easier to derive power from water than air. If you were setting out to design a self steering system it would be far safer to start out with a system as powerful as possible. The HYDROVANE system is more sophisticated. It is a very simple notion to have the wind drive a rudder but it takes considerable engineering to achieve it – no one else has.
