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Rudder angles on wheel steering

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Interlude View Drop Down
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    Posted: 23 April 2022 at 03:25
In contemplating an autopilot upgrade on my 2004 vintage wheel steered 342, I discovered that not only is the wheel rotation slightly asymmetrical (1 turn to port, 3/4 to starboard), but the resulting maximum rudder angle is very asymmetrical, at 30 degrees to starboard and 45 to port. I will crawl under the steering gear to examine the push rod linkage, bus was curious if anyone else has discovered this. If they did, was it correctable by adjusting the pushrod length?

The Lewmar site has a description of the Wide Angle Geometry, which shows +/-36 degrees rudder rotation, and a very clever unequal length set of levers giving non-linear gearing, mechanical advantage increasing with rudder angle compared to amidships.

Hint, some time ago, after pulling off the under deck steering linkage cover in the aft cabin, I found it difficult to relocate the cover with only two hands, not being flexible enough to bring a knee or foot into play. I screwed a 2cm x 2cm batten to the fore and aft divider, to rest that side of the cover on - much easier.
Interlude 342#241
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Arcadia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 23 April 2022 at 07:13
The problem may be solved by adjusting the length of the push rod, but it may also be caused by a misadjustment of the rudder stops. You should check the alignment of the two lever arms. If they are parallel to each other during operation, then leave the push rod alone and make corrections on the rudder stops. Itís possible that both the push rod AND the stops need fixing as well. Either way, 35 degrees each way is correct.
Leon / ARCADIA
2018 Hanse 588
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Interlude Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2022 at 08:19
Thanks Leon, your advice is spot on, I shortened the push rod by about 30mm, lever arms are almost parallel and rudder stops nearly equal. Not perfect but a lot better than before. I can't rotate the annulus which supports the stops because the wiring to the pedastal is intimately involved with the support.

So we will never know if it has been like this for the 17 years I have owned the boat, or only the 6 years since I replaced the rudder - if the location of the keyway in the Jeffa rudder differed from the original. Given the rudder has been at extremes only at very low boat speeds, it was not an issue for manual steering, but for the pilot I prefer symmetry.

Thanks again, Jim
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter-Blake Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2022 at 08:39
Important: Make sure that you adjust the Settings for the New rudderangles in the Computer of your Autopilot! Otherwise it will Push into the endstops!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2022 at 17:17
That is a good point Peter. Iíll suggest that the rudder angle sensor be checked for the correct calibration. It should read zero with the rudder at center. This can be verified on a heading screen or in the settings menu. Depending on whether the sensor is on the lever arm or rudder arm, you may have to readjust it on the calibration menu. This is important not only for rudder limits before you hit the stops, but also for proper course keeping in the computer.
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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Arcadia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2022 at 17:20
Also, Jim, to one of your points, I agree that the cause of all this was most likely the rudder change. The new key way was probably at a different angle compared to the original. This was not uncommon with Jefa.
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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