Last year the control head
to our W-H Autopilot
died. While I'm frankly glad to be rid of the eyesore factor, there is a "robust" hydraulic setup below I'd prefer to re-use with our new NAC-3 computer. Based on previous help from here, I know it's possible at a basic level, I'm just working out the details.
-There's a "plunger" in the cockpit
that actuates the hydraulic bypass valve below allowing manual steering
, is it possible to install a solenoid to switch this instead? It's ugly as sin and if a solenoid fails I can go below in <60s and manually throw the bypass valve.
-Do these solenoids just actuate the existing bypass valve, or do they usually come with their own full valve body and solenoid integrated?
-Or (as I fear) are the bypass solenoids typically integral to the motor
itself, which means I'm screwed because every single
component in my hydraulic setup is separated out?
-Just to sanity check, as this isn't a typical neat and tidy integrated pump/ram/solenoid combo, this is
in fact a "Hydraulic Linear Drive" right? As in not
a "Reversible Pump" as shown in the NAC-3 installation
guide? Or is it technically both? I assume reversible pump
in the diagram below refers to something that would act directly on a fully hydraulic steering
system, rather than using a ram. In which case, I would love the NAC-3 to be able to switch the pictured "Drive Engage" device with the Autopilot
Standby button, by throwing the bypass valve down below.
-Steering is chain and cable, edson pedestal
-AP power unit is a PacSci DC motor
connected by a small belt to a standalone hydraulic pump
-Hynautic hydraulic cylinder directly acts on rudder
-New computer is a B&G/Simrad NAC-3
plotter1.jpg - The manual cable that currently switches the hydraulic bypass (big ugly flex conduit protruding from cockpit
plotter2.jpg - The motor drive unit (a small belt below the blue plate connects it to the black pump body on the right)
plotter3.jpg - Full system overview
plotter4.jpg - Detail view of the bypass valve and cable coming from cockpit
.png - Simrad/BG Installation
As ever, very grateful for any clues as most electronics
outfits have gone radio
silent when I've sent them these photos...