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Old 07 July 2003, 19:02   #1
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Hydraulic steering prob.

Hydraulic steering is all new to me, and so I've got a little problem with it that I don't inderstand.

Let me explain...

At low (displacement) speed, it all works as expected, but once up on the plane and doing over 25kts, the following happens:

To steer to port, turning the wheel to the left is very stiff, but is effective in steering (like being in a "high" gear)

To steer to starboard, turning the wheel to the right is very loose, but was less effective in steering (like being in a "low" gear).

This gives a strange steering effect, where I compensate half a turn to port, than a full turn to starboard...

Could it be that the system just needs bleeding or perhaps something else?
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Old 07 July 2003, 20:23   #2
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Is she still in the Water? If so take Jasper out and he will tell you if it's a problem and what it is.

Is the steering Graunchy at all, and does she favour one side when she leaves the water
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Old 08 July 2003, 02:44   #3
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No, she's out of the water now Stuart.

I didn't think that the steering "felt graunchy" - all quite smooth and at slow speed everything was normal.
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Old 08 July 2003, 04:04   #4
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I've noticed a similar effect but in reverse - i.e. at low speed it turns to starboard very easily, to port like treacle. (or vice versa - I can't remember exactly!) I have no problem at higher speeds

I've found this to be the engine trim - at low speed by playing with the trim I can equalize the steering to both port and starboard. Equally at higher speed when the engine is badly trimmed the steering varies.

I would guess that this is similar to your problem - try playing with the engine trim at speed.

I've always assumed that this is normal - I sincerely hope it's not a symptom of something else!!!

Max
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Old 08 July 2003, 04:15   #5
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no forgive me if I am wrong but I have always understood this eagerness to one side and reluctency to the other to do with the prop spin and which way it turns in the water?

So say your prop spun to the right (clockwise when looking from the stern), the boat would turn easily to starboard, and with an effort apparent in turning the boat to port.

This is a very basic analogy, but thats what I was always told?

Lee
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Old 08 July 2003, 04:22   #6
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I agree entirely that it's the prop causing the imbalance and I think that trimming in/ out amplifies the effect.

Max
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Old 08 July 2003, 15:52   #7
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Thanks for the suggestions, guys. I've got to admit that I'm sceptical... I was out on Sunday in a variety of sea conditions, head sea/following sea, and varied the trim to suit all conditions, but I'm pretty sure the problem was there all the time once up on the plane.

Max/Draki - was that you I saw out on the river at Lymington in a yellow & blue DS21?
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Old 09 July 2003, 04:29   #8
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Richard,
Yep - that was almost certainly me. Which day was that? I was out pretty much all week doing a spot of fishing (with unusually great success - LOTS of mackerel!)

Max
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Old 09 July 2003, 05:10   #9
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Max, we were there on Sunday quite late, tied to the outer end of the Berthon pontoon for half an hour. Enjoy the mackrel!
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Old 11 July 2003, 17:30   #10
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OK, quick update... I gotta bit of a leak on the ram. Small slick of hydraulic fluid in the transom well was the giveaway. It's at the union which seems to be screwed into the body of the ram, so I'm going to try to undo it tomorrow, pack it with PTFE tape and bleed the system. Does anyone know what type of hydraulic fluid to buy, and where to get it (in Southampton)?
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