Mounting Location and Considerations
The antenna, containing a magnetic heading sensor (Point-1), requires careful placement to ensure optimal performance. It should not be mounted within 1 meter (3.3 ft) of any potential magnetic source.
For the RC42N, select a location that provides a solid mounting surface, is free from vibration, and is at least 1 meter (3.3 ft) away from any potential magnetic source. Ideally, it should be positioned as close as possible to the vessel's center of roll and pitch, near the waterline.
Potential sources of magnetic or electromagnetic interference include:
- Electrical Motors/Magnets/Moving Metal items
- Outboard Engines
- High current electrical sources such as main power cables, batteries, and distribution panels.
Diagram 1: Mounting Location Recommendations
Technical Specifications
| Component | Operating Temperature | Protection | Weight | Power Supply | Load | Performance |
|---|---|---|---|---|---|---|
| NAC-1 | -25°C to +55°C (13°F to 131°F) | Splashproof, IPx5 | 0.6 kg (1.3 lbs) | 9-16 V DC | 140 mA + drive unit load | Drive: 8 A cont., 16 A for 1 s |
| Point-1 | -25°C to +60°C (13°F to 140°F) | Watertight, IPx7 | 0.14 kg (0.31 lbs) | 9-16 V DC | <100 mA @ 12 V DC | Heading: +/- 3°, Horiz. accuracy: 3 m (9.8 ft) |
| Standby/Auto button | -25°C to +55°C (13°F to 131°F) | Splashproof, IPx5 | 0.04 kg (0.09 lbs) (including cable) | |||
| Helm-1 | -15°C to +75°C (5°F to 167°F) | Splashproof, IPx5 | 4.6 kg (10.14 lbs) | Motor: 1.3 A (no load), max 5 A, Clutch: 0.8 A | HO-HO 15 s (no load), Max thrust 1.300 N (290 lbs) | |
| RC42N | 0°C to +55°C (32°F to 131°F) | IP56 | 0.4 kg (0.9 lbs) | 8-16 V via NMEA 2000 | 1.4 W | ± 3 degrees after calibration |
Compatibility Information
The drive unit is designed to integrate with common brands of mechanical rotary and rack and pinion steering helm units. It is based on the Morse 290 rotary helm unit and supports Morse 304411 and Teleflex SSC52 rotary cables without modification.
For boats equipped with Teleflex Safe T, Teleflex Big T, Uflex T71, Uflex T73NR, or Uflex T81 systems, a cable adapter must be fitted before installing the drive.
If the boat features a rack and pinion steering system or other rotary systems, the drive can be used, provided the steering cable is replaced with a Morse 304411 or Teleflex SSC52 cable.
The drive unit is capable of a maximum cable push/pull of 136 kg, making it suitable for most cable-steered boats. However, for boats with very stiff steering or high steering loads due to hull design or engine configuration, it's recommended to assess the steering wheel input torque. If the torque required to hold a course exceeds approximately 1.2 kgm (equivalent to 7 kg force on a 35 cm diameter wheel), a hydraulic linear actuator drive system is advised.
Installation Steps
Diagram 2: Tools Needed
Diagram 3: Dimensions
Diagram 4: Cable Lengths
Step 1: Remove steering cables from existing manual helm
Step 2: Remove existing manual helm from dashboard
Step 3: Install Helm-1 to dashboard
Step 4: Install steering cables to Helm-1
Step 5: Helm-1, Rudder feedback calibration
Step 6: Mounting NAC-1
Step 7: Mounting RC42N
Step 8: Mounting Point-1
Wiring Diagram
Diagram 5: Wiring Diagram
Configuration and Reference
Refer to your Autopilot controller's documentation for specific setup instructions.
For more details about Helm-1, consult the Straight Shaft Helm Drive manual, available for download at www.simrad-yachting.com.
