Short type 2 mechanical linear actuator, 300mm, 24V

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Raymarine

M81133

Short type 2 mechanical linear actuator, 300mm, 24V

This 24 V Raymarine electromechanical linear actuator of type 2 delivers a maximum thrust of 480 kg and a stroke of 300 mm for vessels up to 15 tonnes, with an electromagnetic clutch that cancels any rudder resistance in manual mode. Still current and standard in the range, it is designed to integrate with modern autopilots via the ACU-400 computer, while ensuring full backward compatibility with older SPX 30 systems.

Includes: linear actuator, complete mounting bracket (pin, washers, R-pins) and fastening kit for tiller arm (pin, washers, nylstop nut, pin).

Retail priceBenefit from the professional rate

$2,096.00 USD

$2,096.00 USD ~~$2,620.00 USD~~

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Prices exclude import taxes (rate varies by item and state). DAP delivery: import taxes are paid on delivery.

In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Operating voltage	24 V
Bus compatibility	Owner (to Raymarine heading computer)
Wired network	Owner (to Raymarine heading computer)
Wireless connectivity	No
Mounting type	Mechanical mounting under the deck
Certifications	CE, EN60945
Drive unit type	Linear mechanical actuator Type 2
Strokes	300 mm
Mounting hardware included	Yes (mounting foot, tiller arm, pins, washers, nut)
Mounting orientation	Perpendicular to the tiller arm (rudder centered)
Integrated rudder angle sensor	No
RF300 rudder feedback	Compatible
Dual rudder support	No (depends on the heading computer)
Steering modes	N/A (depends on the heading computer)
Disengageable	Yes
Alignment Tolerance Degrees	5
Gross Weight	8.49
Max Recommended Cable Length M	16
Max Recommended Cable Size Mm2	16
Min Operating Voltage Dc	10
Service Interval Hours	1000
Service Interval Years	2
Weight	7.722

Detailed description

Performance and mechanical integration

The Raymarine type 2 short 24V mechanical linear actuator is a high-performance autopilot actuator designed for sailboats and powerboats requiring significant thrust force. Unlike type 1 models, this type 2 actuator offers superior robustness for demanding steering systems while maintaining a compact installation footprint thanks to its 300 mm stroke. Powered by 24V, it integrates seamlessly with Raymarine course computers (such as the ACU or SPX series) to ensure rapid and surgically precise rudder response.

Installation and rudder geometry

This mechanical actuator acts directly on the rudder quadrant or tiller arm. Installation requires rigorous alignment to ensure maximum mechanical efficiency: the push arm must be strictly perpendicular to the tiller arm when the rudder is in the central position (alignment variation tolerance less than 5 degrees). Weighing 7.72 kg, its industrial design requires mounting on a structure capable of absorbing significant loads. To maintain optimal performance, Raymarine recommends a full inspection every 1000 hours of use or every 2 years.

Electrical requirements and wiring

To ensure stable 24V power supply without voltage drop (which could reset the system), cable sizing is critical. According to the manufacturer's installation specifications, 4 mm² (12 AWG) wiring is required for lengths up to 3 meters, 6 mm² (10 AWG) up to 5 meters, and up to 16 mm² (6 AWG) for lengths up to 16 meters. Adhering to these cross-sections and EMC installation guidelines (keeping at least 1 meter away from VHF cables and 2 meters from HF signals) ensures total immunity to radio interference.

Documentation

Type	Nom
	EN - Installation instructions for the mechanical linear actuator - Mechanical linear actuator type 2 short, 300mm, 24V
	EN - 2D Plan of mechanical linear actuator type 2 short, 300mm - Mechanical linear actuator type 2 short, 300mm, 24V
	EN - Declaration of Conformity - Mechanical linear actuator type 2 short, 300mm, 24V
	EN - Declaration of Conformity - Linear mechanical actuator type 2 short, 300mm, 24V
	EN - Declaration of Conformity - Type 2 short mechanical linear actuator, 300mm, 24V
	EN - Declaration of Conformity - Type 2 short mechanical linear actuator, 300mm, 24V
	EN - Technical Document - Type 2 Short Mechanical Linear Actuator, 300mm, 24V
	EN - Installation manual - Mechanical linear actuator type 2 short, 300mm, 24V
	EN - Installation manual - Type 2 short mechanical linear actuator, 300mm, 24V
	EN - Declaration of Conformity - Mechanical linear actuator type 2 short, 300mm, 24V
	EN - Declaration of Conformity - Mechanical linear actuator type 2 short, 300mm, 24V
	EN - Declaration of Conformity - Mechanical Linear Actuator Type 2 Short, 300mm, 24V
	EN - Declaration of conformity - Mechanical linear actuator type 2 short, 300mm, 24V

Expert opinion

Pol CONIN

Digital Manager

« Mechanical reliability and 24V electrical optimization for demanding steering systems »

The Raymarine Type 2 short mechanical linear actuator (M81133) is the industrial standard for cruising sailboats and displacement vessels up to 15,000 kg. Operating at 24V, this electromechanical power unit is designed to provide flawless reliability and absolute control during long offshore passages. Mechanically, it delivers an impressive maximum thrust of 480 kg and handles a rudder torque of up to 1,190 Nm, ensuring authoritative course holding even in rough seas.

Internally, this actuator features a combination of a high-power electric motor, a high-strength belt drive, and a precision planetary gear reducer. This design ensures an extremely fast port-to-starboard response time of just 11 seconds. One of its key advantages at sea is its integrated electromagnetic clutch with fail-safe operation. When the autopilot is put on standby, this clutch instantly disengages the mechanism, providing very low mechanical resistance (back-drive force). This completely preserves the smoothness of manual steering, with no friction or resistance from the motor.

In terms of system integration, its compact 300 mm stroke makes it a strategic solution for tight helm spaces while maintaining high-level performance. It interfaces optimally with the Raymarine Evolution ACU-400 control unit. Regarding installation, it is critical to note that the mechanical stresses generated by this actuator require mounting on a floor beam or a substantial vessel structure. Rigorous geometric alignment with the independent tiller arm or quadrant is mandatory, as the spherical joint allows a maximum misalignment of +/- 5 degrees. With an average power consumption between 66 and 96 W and exceptionally quiet operation, this actuator is the preferred choice for 24V integration combining endurance, power, and discretion.

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Short type 2 mechanical linear actuator, 300mm, 24V

$2,096.00 USD

$2,096.00 USD ~~$2,620.00 USD~~

Frequently Asked Questions

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What type of boat is the Type 2 short mechanical linear actuator designed for?

This Raymarine cylinder (part number M81133) is designed for sailboats and motorboats requiring high thrust force for their steering system.

What is the travel length of this Raymarine linear actuator?

The standard Type 2 model has a 300 mm stroke, allowing it to maintain a compact installation format while delivering high mechanical performance.

What is the input voltage for this model?

This mechanical linear actuator operates exclusively with a 24V supply voltage.

Which autopilot computers is this linear actuator compatible with?

It integrates seamlessly with Raymarine autopilot computers, particularly the ACU or SPX series, to ensure fast and highly accurate rudder response.

How should the hydraulic ram be aligned relative to the rudder stock?

Installation requires precise alignment. The pushrod must be strictly perpendicular to the tiller arm when the rudder is in the central position. The allowed alignment variation is less than 5 degrees.

On which part of the steering system does the ram act?

This mechanical actuator acts directly on the tiller quadrant or the rudder arm of your boat.

What is the weight of the M81133 actuator?

The cylinder alone weighs 7.72 kg. Due to this weight and the thrust force exerted, it must be mounted on a very solid structural base.

What is the recommended maintenance interval for this ram?

Raymarine recommends a full service by an authorized dealer every 1,000 hours of use or every 2 years, whichever comes first.

Which cable section to use for a 3-meter distance?

For a 24V installation with cable length up to 3 meters, a 4 mm² (12 AWG) cross-section is required to prevent voltage drops.

What wiring is required for a 5-metre distance?

If the power cable length reaches 5 meters, the manufacturer's specifications require the use of a 6 mm² (10 AWG) cable.

What cable size is required for a 10-meter installation distance?

For a distance up to 10 meters at 24V, use cables with a 10 mm² (8 AWG) cross-section.

How far from a VHF radio should the actuator be installed?

To avoid electromagnetic interference, the actuator must be installed at least 1 meter (3 feet) away from any equipment or cable transmitting radio signals, such as a VHF.

Should the hydraulic ram be kept away from an SSB radio?

Yes, for HF radios (SSB), the minimum separation distance from the hydraulic ram must be increased to 2 meters (7 feet).

Can I connect the linear actuator to the engine starter battery?

No, it is strongly recommended to power the equipment from a dedicated battery. Voltage drops during engine start (below 10V) could cause the autopilot system to reset.

Can this actuator be used on a 12V electrical system?

No, reference M81133 is specifically designed for 24V systems. If you have a 12V network, you will need to use the corresponding cylinder reference (M81131).

What are the installation precautions for a radar?

The actuator must be installed more than 2 meters (7 feet) from the radar beam path to avoid any electromagnetic interference.

What is the main difference between a type 1 ram and this type 2 ram?

Unlike Type 1 models, the Type 2 hydraulic ram offers superior robustness and greater thrust force, making it suitable for heavier and more demanding steering systems.

Does the cylinder mounting structure need to be reinforced?

Yes, the industrial design of this hydraulic ram generates very high thrust forces. It therefore requires mounting on a structure capable of absorbing heavy loads. If in doubt, consult the manufacturer of your steering system.

Is it possible to cut and extend the supplied power cables?

It is not recommended to cut or splice the cables specified by Raymarine, as this may compromise electromagnetic performance (EMC), unless the procedure is explicitly detailed in the installation manual.

What cable length is required for a very long distance (up to 16 meters)?

For a very long installation, up to 16 meters at 24V, it is imperative to use a thick cable, specifically 16 mm² (6 AWG), to ensure stable power supply to the actuator.