Possibly/Probably disastrous steering problem :(

[rogerthebodger]

Built my own hydraulic duel steering and a hydraulic transom hatch.

The angle of the rudder should be no more than 35 degrees each side of centre otherwise the rudder will stall and both my steering pumps include a pressure relief valve to prevent over stressing any of the rudder fittings when you reach full over rudder.

 

[Cardo]

Built my own hydraulic duel steering and a hydraulic transom hatch.

The angle of the rudder should be no more than 35 degrees each side of centre otherwise the rudder will stall and both my steering pumps include a pressure relief valve to prevent over stressing any of the rudder fittings when you reach full over rudder.

35 degrees? That's all?

 

[alahol2]

35 degrees? That's all?

My transom hung rudder is restricted to about 30 - 35 degrees. I suspect much more than that could put severe strain on the rudder for not much (if any) gain in turning force.

 

[rosssavage]

I'd prefer to mount it on the side as then it leaves the bar linking the rudders (and my template for decent emergency steering) in situ and I don't have to mess around with that.


Well, this was my thinking. The rudders themselves can turn all the way to the side (perpendicular to boat) due to the way they're mounted. This is of course far more than necessary, so as long as the movement is less than that then I don't foresee a problem. To be honest, that K-19 ram looks just the ticket. The movement is equal to three turns of the wheel and the stroke is just less than what I have now (which is far too much anyway). Grehan has kindly provided me with a couple of names of people to speak to, so hopefully one of those will be able to assist.


Don't say that, this steering system was going "well" for a number of years

True, but my hydraulic arch isn't held to gether with bits of glorified string!

 

[NormanS]

35 degrees is generally accepted as the maximum efficient angle.

 

[Cardo]

True, but my hydraulic arch isn't held to gether with bits of glorified string!

Hey, the fancy steel cables aren't the cause for the failure! They're more of a failure waiting to happen.

35 degrees is generally accepted as the maximum efficient angle.

Cool, I shall take this into account when getting this all sorted.

Edit: Just to be clear - The rudders only need to move a total of 70 degrees from one side to the other? This does seem to be less than what many boats I've seen can do, but if that's all that's required, it should be pretty easy to sort out.