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ComNav Admiral P3 Installation & Operation Installation
Document PN 29010075 V3.1 - 44 -
Rudder Follower
The Rudder Follower is used to transmit the position of the rudder back to the Autopilot. It
should be connected to whatever parts of the steering system the Autopilot controls.
Normally, this will be the vessel’s rudder. However, if the vessel has a two-stage steering
system where the Autopilot drives a control or servo ram, the Rudder Follower should be
mounted to the servo ram rather than to the rudder.
Normally the Rudder Follower is mounted in the stern of the vessel, close to the rudder post.
A mounting base may have to be fabricated to position the Rudder Follower properly. Mount
the Rudder Follower in a location where the possibility of damage from any equipment
stowed in the area is minimized.
Note: If you are connecting the Admiral P3 to a mechanical Cable Drive (for vessels that use
cable steering instead of hydraulic steering) the rudder follower is built into the Cable Drive.
Rotary Rudder Follower
Mounting
Mount the Rudder Post Arm on the rudder post using a stainless steel band clamp (not
supplied). Bolt the ball joint to the hole in the Rudder Post Arm corresponding to the
diameter of the Rudder Post in inches, making sure the ball is facing upwards.
Mount the Rudder Follower so that the Rudder Follower Arm is the same height as the
Rudder Post Arm. The Rudder Follower is centered when the arm is directly above the cable
gland (see Figure 22).
The distance between the centerline of the Rudder Post and the Rudder Follower must not
exceed 24 inches. Make sure that the ball joints on the Rudder Arm and Rudder Follower
arm are facing upwards as shown in Figure 3.
Snap the rod assembly onto the ball joints. Be sure to close the release clamps on each
socket. Refer to Figure 22, and adjust the length of the rod to get the correct geometry with
the rudder dead-ahead.
If the locking screw in the Rudder Follower arm has been loosened, or the arm removed from
the Rudder Follower, re-attach the arm and check the potentiometer center position.
When the rudder is dead-ahead, the electrical resistance between the wires of the black &
green wire pair, and the wires of the white & green wire pair, should be equal (approx. 600
ohms each).
Be careful to check the installation for any mechanical obstructions or binding of the linkage,
and correct it now, before it becomes a problem.
46


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