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Old 19-05-2017, 12:06   #1
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Rudder problem

Hi guys

Just hauled out my to be Beneteau 411 for inspection/survey and noticed that the rudder is hitting the hull when turned fully to the starboard.

What do you reckon the problem is please?
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Old 19-05-2017, 12:09   #2
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Re: Rudder problem

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Hi guys



Just hauled out my to be Beneteau 411 for inspection/survey and noticed that the rudder is hitting the hull when turned fully to the starboard.



What do you reckon the problem is please?
Is the upper corner of the leading edge or trailing edge hitting the hull? If leading edge then your rudder is bent towards starboard, if trailing edge then bent towards port.

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Old 19-05-2017, 12:35   #3
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Re: Rudder problem

It's the upper corner of the trailing edge that is hitting the hull, but only when turned to starboard. The rest have good clearance.
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Old 19-05-2017, 12:41   #4
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Re: Rudder problem

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Originally Posted by caughtthewind View Post
It's the upper corner of the trailing edge that is hitting the hull, but only when turned to starboard. The rest have good clearance.


It's worth checking to see if the rudder bearing and bearing-shoe has been displaced. Also check to see if there is too much movement in the rudder (I.e. Can you shake/rattle it) forward to aft? Otherwise it would suggest that the rudder stock has been bent to port and slightly aft (collision?).



Is the trailing edge corner hit stopping the rudder going to it's full end-stop (the restrainer chains at the quadrant) or simply brushing/wearing on the bottom paid.

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Old 19-05-2017, 12:47   #5
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Re: Rudder problem

Bearing seem solid. Cannot notice any play. I'll be inspecting this tomorrow in more detail. Antifouling is gone where it is brushing.
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Old 19-05-2017, 12:53   #6
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Re: Rudder problem

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Originally Posted by caughtthewind View Post
Bearing seem solid. Cannot notice any play. I'll be inspecting this tomorrow in more detail. Antifouling is gone where it is brushing.
Might also be worth checking inside the hull at the rudder tube to see if there's any cracking around the joint between the tube and the hull or between tube/hull and gusset plates (supporting triangular plates that reinforce the angle between rudder tube and hull).

Good luck!

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Old 19-05-2017, 12:56   #7
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Re: Rudder problem

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Bearing seem solid. Cannot notice any play. I'll be inspecting this tomorrow in more detail. Antifouling is gone where it is brushing.
Also, get a length of inextensible string/line and put a loop in one end and put it over the winch on the stb side, then pull the string taught down to the middle of the base of the rudder, marking off the position on the string. If you do the same with the line from the port winch (assuming them both to be symmetrically located around centerline), then you'll get an indication of how far to port the rudder is bent.

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Old 20-05-2017, 11:05   #8
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Re: Rudder problem

Hi guys

Here are a couple of photos. When the rudder is turned to starboard you can see that it brushes against the hull while to port you can see the proper clearance.

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Old 20-05-2017, 16:31   #9
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Re: Rudder problem

I believe Cavalier is correct. Check rudder shaft and rudder tube inside the boat. It's a simple matter of physics. Good luck and safe sailing.
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Old 20-05-2017, 18:36   #10
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Re: Rudder problem

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I believe Cavalier is correct. Check rudder shaft and rudder tube inside the boat. It's a simple matter of physics. Good luck and safe sailing.
I'll be curious how this turns out. I had dropped my rudder last year and everything was straight but I noticed a piece of wood had been taped to the rudder stop by the PO. I removed this and am now noticing that the rudder is rubbing away the paint on the port side. There is good clearance on the starboard side. Everything otherwise looks good at the rudder post so I'm going to reinstall the wood stopper! At least until I figure out if this is a problem....
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Old Yesterday, 07:12   #11
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Re: Rudder problem

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I'll be curious how this turns out. I had dropped my rudder last year and everything was straight but I noticed a piece of wood had been taped to the rudder stop by the PO. I removed this and am now noticing that the rudder is rubbing away the paint on the port side. There is good clearance on the starboard side. Everything otherwise looks good at the rudder post so I'm going to reinstall the wood stopper! At least until I figure out if this is a problem....

There is one thing both you and the OP should also consider: misplacement of a retaining shaft collar when the boat was manufactured or after a later repair. Although the shaft is generally held in place by the steering quadrant with a shaft bolt, there could very well be some slippage if a shaft collar is either out of alignment or one does not exist. When I pulled my rudder for rebuild, I replaced my shaft collar directly above the shaft tube and added an additional collar directly below my upper bearing for added security. Perhaps overkill, but bulletproof. However, as Cavalier noted earlier, I would have a strong suspicion of a slightly bent shaft since even a defective rudder bearing would cause improper alignment/rubbing on both port and starboard. Take a trip to the back of your boat and look at your steering system carefully. Take some pix so you can think about it over time. I hope this helps. Good luck and safe sailing.
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