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post #1 of Old 06-07-2013 Thread Starter
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Sailboat Rudder (ROM) Range of Motion

(1974 Tartan 34) I am reinstalling my rudder, autopilot, and all associated hardware (quadrant, cables and pullies etc.) and am curious about the specified or typical range of the rudder movement in degrees. Here is what I have read so far (valid or not): Beyond 45 deg. the rudder will cavitate much like a boat aircraft propeller and be ineffective in controlling the direction of the vessel. Is this true? A further description is that it will "stall" like an aircraft wing. Certainly makes sense taken to it's logical extreme (a rudder turned to 90 deg. would be ineffective). Given the range of sailing velocities (say, 0-8kts). where is the "sweet spot area" on the range of movement and should rudder stops be placed at the point beyond which the rudder ceases to work? Should the effective control range be expected between 0 deg. (straight ahead) and say, 40 deg. starboard and port, or is that level of attempted control excessive for a small to mid size cruiser?
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