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I have been looking for an autohelm solution for a while, hoping that maintaining course might help me realise a better set of sail. The likes of the ST1000 seemed sub optimal considering our particular tiller setup.
So when I stumbled upon this freeboard project I thought it was worth a go. It is an open hardware project with an interface board that abstracts the popular marine protocols.
I have been concerning myself with how I could provide the actuator to drive the rudder. The main problem being how to provide a clutch. My aim is to use the minimal amount of power to adjust and lock the helm.
My research has led me to the use of a SAAB convertible hydraulic system as used for the roof. It is a single unit containing electric motor pump reservoir and manifold containing 3 solenoids, it cost me about £50 from a popular auction site ;-). It is also not very heavy and has pressure saftey systems that limit the pressure to 140bar.
I have since found good documentation on the pump. But if anybody has experience designing hydraulic systems I would be most grateful of the help. My hope is that I can re-use the manifold, but I don believe it impossible to create an alternative. I should be able to adjust the gearing by changing the size of the piston.
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