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Octopus 12 Stroke Mounted 38mm Linear Drive 12V – Up To 60 or 33,000lbs
The Octopus 12 Stroke Mounted 38mm Linear Drive delivers heavy-duty electromechanical steering for US sailing yachts, featuring a direct-mount actuator for vessels up to 33,000 pounds displacement.
- Drive Design: Mounted Electromechanical Linear Actuator
- Thrust Force: 1100lb Maximum Peak Thrust
- Weight Capacity: 33,000lb Max Displacement Limit
- Stroke Length: 12-Inch Mechanical Ram Travel
- Bore Size: 38mm High Torque Piston
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Description
Direct Rudder Actuation and High Torque Analysis
Mechanical steering linkages on high-displacement yachts frequently experience cable stretch and manual helm slippage during autopilot engagement. The Octopus 12-Stroke Mounted Linear Drive delivers 1000 pounds of thrust via a 38mm bore piston. This unit is designed for direct mounting to the rudder post or quadrant for absolute control.
The drive integrates with 12V autopilot computers via a dedicated high-current clutch circuit for immediate manual override. A 12-inch stroke length ensures full rudder travel for vessels up to 33,000 pounds displacement. Heavy-duty internal gears and a robust mounting bracket provide long-term durability against mechanical fatigue in heavy following seas.
Strategic Vessel Application
Mandatory for sailing vessels and powerboats up to 33,000 pounds requiring a post-mounted linear drive for direct steering.
Technical Key Features
- Linear drive delivers 1000 pounds of thrust
- 12-inch stroke length supports full rudder articulation
- Supports vessels up to 33,000 pounds displacement
- Internal clutch enables immediate manual helm override
- 12V DC motor draws 4-6 amps average under load
- Precision 38mm bore piston maintains 0.1 degree accuracy
- Integrated mounting bracket simplifies direct quadrant installation
OCTOPUS 12 Stroke Mounted 38mm Linear Drive 12V Specifications
| Drive Type | Integrated Hydraulic Linear Drive (Mounted) |
| Pump/Ram Capacity | 38mm Bore Heavy-Duty Cylinder |
| Flow Rate / Speed | 12-Inch (300mm) Full Stroke Span |
| Max Pressure | 1000 lbs (450 kg) Peak Thrust |
| Cylinder Compatibility | Vessels up to 33,000 lbs (15 Tons) |
| Operating Voltage | 12V DC System |
| Peak Current Draw | 30A High-Load Capacity |
| Average Power Draw | 4A - 10A Under Sailing Conditions |
| Motor Type | High-Torque Reversing DC Motor |
| Computer Compatibility | NAC-3, ACU-400, Reactor 40 Mechanical |
| Port Size / Thread | Self-Contained (No External Hoses) |
| Drive Connection | Tiller Arm / Quadrant Pin |
| Rotation/Stroke Direction | Linear Push-Pull Extension |
| Mounting Type | Fixed Foot Pivot Bracket |
| Housing Material | Hard Anodized Aluminum & Stainless Steel |
| Waterproof Rating | IPX6 Marine Protected |
| Operating Temperature | -20°C to +55°C Robust Range |
| Length (Overall) | 780 mm (Extended Profile) |
| Width/Diameter | 125 mm Main Chassis |
| Weight | 9.0 kg (19.8 lbs) |
| Included Accessories | Mounting Foot, Clevis Pin, Hardware |
| Key Mechanical Feature | Mounted pump-on-cylinder for zero hose loss |
Octopus 12" Stroke Mounted Linear Drive (33,000 lbs) Technical Guide
This high-torque linear drive is designed for blue-water sailing yachts up to 60 feet in length or a maximum displacement of 33,000 lbs. The 12-inch stroke provides the necessary leverage to handle large rudder loads in heavy following seas.
The "Mounted" version features an integrated hydraulic pump and reservoir directly attached to the linear actuator. This creates a compact, self-contained unit that eliminates the need for separate hydraulic hoses and external tanks.
The 38mm cylinder bore provides higher thrust force, up to 1,100 lbs. This allows the drive to move heavy rudders with less effort from the motor, translating to lower power consumption and a longer lifespan for the autopilot electronics.
This drive requires a high-current autopilot computer such as the Raymarine ACU-400 or Simrad NAC-3. It operates on 12V DC and features an electromagnetic clutch that must be powered by the computer's clutch output.
This specific drive unit does not come with a built-in sensor. For the precision required on a 60-foot yacht, it is highly recommended to install a standalone rudder feedback unit directly on the rudder quadrant.
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