SeaHorse II wrote:FF wrote:
Time for a better AP with more authority and quicker response.
******* I have a Simrad AP 16 that has been working quite well. I've thought about changing it out but then my rudder size (small) is now on my mind. While at sea, I watched the rudder indicator moving quite a bit but never holding a relatively straight course. (I expect some deviation in a seaway but not to the extent I experienced.)
Only pics I have of the rudder:
**CAUTION!!!!* THIS IS NOT A PROFESSIONAL OPINION.* USE AT YOUR OWN RISK"
The rudder looks plenty big enough for a boat running at semi displacement speeds.* If you were in a quartering or following sea, the second picture seams to tell the story.* the square transom and flat sections of the bottom aft portion would be too much for the keel and rudder to hold on track.* In other words the stern would get pushed around quite abit.* It looks like a great boat in a head sea with the spray rails and flared bow.* When the wind from the side is blowing spray back on the boat, nothing seams to work.* Looks to me like the usual type handling for a boat with fine sections forward and flat sections aft.* Some sophisticated auto pilots have the ability to learn and thus do a little anticipating, but quartering seas can be a problem for most any auto pilot.* A good deep V hull with gobs of power can probably handle those type situations best.
If you have tabs you can try to take all tabs off to raise the bow out of the water.* That can help on bow steer and shearing.