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Hydraulic Steering

Posted: Sat Jun 20, 2009 3:58 am
by Jim
I think the amount of force required to bend a decent strength tie rod, would cause severe rudder damage and if that tie bar was enclosed in a outer tube or as mine is with 5 bushes, (mine is just polished s/s thin wall exhaust pipe)I would think the rudder would have to be ripped off before the tie bar bent. Having said that, so far I have gone out of my way to avoid hitting the reef. If there is still any doubt as to the chances of the tie bar bending it could be attached to the tiller with a sheer bolt, say 6mm for a lighter boat and 8mm for a heavier one, but they would need to be replaced more often than a larger dia. bolt due to the wear factor. That way if you hit something hard the tiller bolt would/should sheer and hopefully protect the rudder. It would just be a matter of fitting a new bolt and you are on your way. In theory.

Jim.

Hydraulic Steering

Posted: Sat Jun 20, 2009 9:25 pm
by Future
Thanks everyone for your thoughts.

My design is an 11m Waller like Nine Lives.
Nine Lives (waller 11 mt) is being fitted with Teleflex steering and has a tie rod (inside the rear beam)
Nine Lives tie rod is a heavy stainless pipe, 75mm diameter, 5mm walls that is not supported. It hangs inside a void between 2 bulkheads that form the rear beam. It will only be supported by the mini tiller attaching points at each end. That is why it is so heavy, so it cannot bend as it is unsupported.


Nine Lives steering is being built as described in the plans. I am concerned about the flex and also the amount of weight that is hanging off the tiller arms (Tie Bar)



The loaded weight of the boat will be around 6.5 tonnes. This is no light weight flyer but our moving home.



I am also keen to see some inside photos of Nine Lives if possible?

Hydraulic Steering

Posted: Sun Jun 21, 2009 3:35 am
by puremajek
Future

Ask Mike how many have had problems in this area. If the answer is none, then why try and re-invent the wheel? (says me, having 'been there and done that' and wasted copious amounts of time re-inventing), to find the same or very similar answer. :lol:



The other issue is that when and if it comes time for resale and they ask the designer "Was it built to plan?", what do you want him to say? I know other designers face this all the time.



Just food for thought.

Hydraulic Steering

Posted: Sun Jun 21, 2009 8:44 am
by mahnamahna
Here are 2 of the rudder post, tie rod set up.











The rudder post is glass over pvc pipe up with a ply web behind it to the bulkhead all glassed in and through which the rudder shaft protrudes, to that a s/s collar takes the rudders weight and rotates on a nylon bush that goes into the pvc post which also has a ply pad glassed to the top to take the bush and provide a platform to take the rudder weight and the collar has a mini tiller welded to it which attaches to the tie rod and suspends the tie rod inside the shaft that spans the rear of the boat to the other tiller.

Hydraulic Steering

Posted: Mon Jun 22, 2009 1:37 am
by Future
Thanks for the photos Paul

Re: Hydraulic Steering

Posted: Mon Oct 01, 2012 3:29 pm
by Chrisg
This question is to those who have hydralic steering and and autohelm using a hydralic pump. Where did you install the pump?

Re: Hydraulic Steering

Posted: Mon Oct 01, 2012 4:00 pm
by Whimsical
Chris
My autopilot pump will be installed on the bridge deck directly under the helm pump along with all the electronics.
It can be anywhere along the main lines before they seperate and go to opposite hulls, assuming u have 2 cylinders.

Re: Hydraulic Steering

Posted: Mon Oct 01, 2012 4:32 pm
by Chrisg
mike, what bred of hydralic steering system will you be installing? we are using hydrive twin rams with hydralic link, combined with a raymarine type 1 pump.

Re: Hydraulic Steering

Posted: Mon Oct 01, 2012 5:36 pm
by Whimsical
Chris
Same as you, HyDrive twin ram with fluid link
Using a cat valve to center the rudders.
If u haven't got the pump yet can get them from England a lot cheaper than any of the marine equipment versions. I have the pump but not sure which auto pilot i will use, most likely at this stage is the Simrad.

Re: Hydraulic Steering

Posted: Tue Oct 02, 2012 6:52 am
by Jim
I have my helm pump (SeaStar HH5272 2.4 cu in) and steering computer (Raymarine) behind the helm and the auto steering pump (Raymarine Type 1, I think, is inside the rear crossbeam all connected with nylon hydraulic tube. The rudders have 1 Hydraulic ram on the port side tiller and the rudder position indicator on the Starboard tiller, all works a treat. There should be photos on Members Multis, Leslie James.
Jim.