BoaterEd — replacing rudders on a power boat to larger

28 Апр 2014 | Author: | No comments yet »
Silverton 362 Sedan

Posted — Jul 11 2007. 00:01:02

bbruno,

Some thoughts and another boater’s experience.


To me there are two issues here probably related but somewhat different.

The first issue is the poor steering at low/idle speeds. I have owned two twin inboard engine boats over a period of 17 years and never experienced this problem. I have heard that some boats with prop pockets do not handle as well. I recently bought a 21 foot IO and found that it was difficult as certain idle speeds to keep it on a straight track. I now lower the trim tabs and it seems to track better, probably I have learned to make some adjustments to my experience handling inboards. Possibly you will experience similar adjustment period going from an IO to an inboard. Try lowering the trim tabs and make sure they both work.

Silverton 362 Sedan

The issue of running on one engine in tight quarters at idle is one that is a challenge to everyone. Since the propeller is off center the boat wants to turn in one direction and the rudder is already over hard in one direction to keep the boat running straight. I had an experience of loosing one engind due to picking up a crab trap and found it difficult to make a 90 degree turn to get to a lift. Lucky for me there was a gas dock next to a haul out location that I could slip into without incident. I don’t know if I could make the hard turn with the propeller turning the boat in the opposite direction. Docking under windy conditions or manuvering in tight quarters can be scarey with one engine and it is probably better to accept the tow rather than risk an accident especially with a larger and heavier boat which is not easy to shove off should the need arise.

At the time I lost one engine due to a crab trap, I was not quick enough to lower the trim tab on one side to center the rudder, I don’t know how effective that would be. At low RPM the rudders do not have much effect and I normally make sharp turns with either the gears or increasing the rpm on one side. Alternatively short bursts of engine RPM does give the rudder better action. One of my previous boats was a single engine 34 foot trawler with a large rudder and it responded well to rudder position with short bursts of power which was standard docking procedure.

The other option (expensive)is to install a bow thruster which would improve control with one engine down. I don’t have one so don’t know how effective it would be. In any event the larger rudder on a planning boat sounds radical to me without some advice from a professional designer.

I would not change the rudder without such advice.

Silverton 362 Sedan
Silverton 362 Sedan
Silverton 362 Sedan
Silverton 362 Sedan

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