Originally Posted by svHyLyte
.................. Our drive is a hydraulic ram type that quite easily handles the ship, even under very adverse wind/sea conditions.
HyLyte points out an important factor. The size of the vessel is secondary to the mechanics of the steering system. A low power auto pilot system can easily operate a hydraulic drive that in turn supplies a great force to the steering of the vessel. I would think that worm gear would come next in line with the need for power from the auto pilot and cable with quadrant comming in with the most need of power supply. I "married" a Nexus control head to my 1973 Benmar hyraulic drive twenty years ago and it continues to work well with the drive now forty years old.
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Take Care and Joy, Aythya Crew