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Old 08-27-2018, 08:17 PM   #1
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Mainship 400 trawler articulating rudder?

Guys, some of the Mainship 400's that are for sale have added an articulating rudder. Can someone explain what these are and the benefits?

On a single engine 400 trawler with only a bow thruster would the articulating rudder be as useful as a stern thruster would? Or is it still more desirable to have the bow and stern thruster?
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Old 08-27-2018, 08:54 PM   #2
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The articulating rudder replaces the single flat rudder with one with two segments. This creates a sort of curved surface when the rudder is turned hard over which gives it significantly better performance.


In the scheme of things with cost being factored in, I would want a bow thruster first, a stern thruster second and an articulating rudder third. But two and three are pretty close.


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Old 08-27-2018, 10:56 PM   #3
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I think I agree with David, although I’ve never had an articulating rudder. I have a bow and stern thruster but would really love to add an articulating rudder to my boat.
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Old 08-28-2018, 12:43 PM   #4
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I think I agree with David, although I’ve never had an articulating rudder. I have a bow and stern thruster but would really love to add an articulating rudder to my boat.
Yes, I definitely want a stern thruster on my "new" boat.

Okay, the consensus is that an A.R won't "replace" a stern thruster but is a complement. Good to know.
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Old 08-29-2018, 11:08 AM   #5
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Articulating rudder 101





The last YouTube video does a good job of showing the practical application and benefits IMHO.
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Old 08-30-2018, 07:51 AM   #6
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Thanks guys. Shrew, that last video is amazing.
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Old 08-30-2018, 11:39 AM   #7
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Honestly, you can get a tighter turning radius using the 'bump and fill' method, even without a bow thruster.
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Old 08-30-2018, 12:36 PM   #8
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Bayview Engineering (BEI) articulated rudders

Does anyone know if this company is still in business?
A google search of Bayview Engineering (http://www.bayviewengineeringind.com) leads to a blank web page.

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Old 08-30-2018, 12:40 PM   #9
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Honestly, you can get a tighter turning radius using the 'bump and fill' method, even without a bow thruster.

In one direction. I can turn my boat on a dime to starboard doing that. Not so much to port.
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Old 08-30-2018, 02:31 PM   #10
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In one direction. I can turn my boat on a dime to starboard doing that. Not so much to port.
True. My prop is turning the other way. I turn tightly to port and prop walk in reverse to Stbd.
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Old 08-30-2018, 03:10 PM   #11
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Guys, some of the Mainship 400's that are for sale have added an articulating rudder. Can someone explain what these are and the benefits....

I’ve installed BEI rudders on my last two trawlers. My current boat, a 47’ Selene, is equipped with bow and stern thrusters—very useful in getting the boat to move those last few feet to the dock; and to keep it there when wind is blowing you off/away from the dock. But nothing compares to the dramatic performance I get from the AR for close quarters maneuvering. I can turn 180 degrees in my own boat length without back-and-fill. So many other examples but no need to go into those here. You can reach Ron and Carol at BEI @ (360) 920-9459.
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Old 08-30-2018, 09:33 PM   #12
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I’ve installed BEI rudders on my last two trawlers. My current boat, a 47’ Selene, is equipped with bow and stern thrusters—very useful in getting the boat to move those last few feet to the dock; and to keep it there when wind is blowing you off/away from the dock. But nothing compares to the dramatic performance I get from the AR for close quarters maneuvering. I can turn 180 degrees in my own boat length without back-and-fill. So many other examples but no need to go into those here. You can reach Ron and Carol at BEI @ (360) 920-9459.


Great endorsement. Any idea what the rough cost would be on a boat like your Selene?
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Old 08-31-2018, 08:26 PM   #13
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Meh. Just buy one with twins.
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Old 10-08-2018, 09:41 AM   #14
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Great endorsement. Any idea what the rough cost would be on a boat like your Selene?


Cost of the new rudder was $6800, plus labor...we did the install when the Selene was on the hard for another project so labor was not much...maybe $1000 to drop the original and install the new one.
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Old 10-09-2018, 12:28 PM   #15
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Cost of the new rudder was $6800, plus labor...we did the install when the Selene was on the hard for another project so labor was not much...maybe $1000 to drop the original and install the new one.

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