Now I know that HYDROVANE is NOT a servo pendulum. But what is a servo pendulum?
A servo system pulls lines that move the steering wheel or tiller – enough to bring the boat back on course. Such a system includes a blade or paddle, called a servo blade, in the water that swishes from side to side, like a pendulum, directed by its windvane sensor. That oscillating blade is attached to certain lines that are connected to the main wheel or tiller. As the boat goes off course, the vane is pushed over; that pushing motion twists the blade in the water; once twisted it moves with force to one side; that movement pulls the lines that turn the tiller or wheel that moves the rudder. Once on course the vane flops back to vertical/neutral and the servo blade reverts to trailing in the wake. A servo system does not have its own rudder like the Hydrovane. It simply pulls lines that cause the boat’s steering system to keep it on course.
