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Understanding Active Ride-Control Systems

Active ride-control systems use motion sensors and fast control algorithms to coordinate fins, interceptors, trim tabs or foils.

Depending on the installation, the system may reduce roll, pitch, vertical acceleration and undesirable running trim. Its effectiveness depends on vessel speed, hull response, sensor accuracy, system tuning and the condition of the surfaces and actuators.

This free technical guide gives yacht owners and prospective buyers a practical introduction to integrated ride-control systems on faster motor yachts. It explains how sensors, controllers, actuators and hydrodynamic surfaces work together, and what safe options should remain following a fault.

Download the Free Guide

Why active ride-control systems matter

Active ride control can improve comfort and vessel behaviour, but it coordinates several fast-moving surfaces capable of producing significant hydrodynamic and structural loads.

Incorrect speed, heading or motion data may cause the controller to command unsuitable corrections. A stuck actuator, incorrect position feedback or asymmetrical surface movement could create unexpected list, trim, drag or steering forces.

Integrated systems may also share a single motion sensor, controller, hydraulic supply, electrical bus or data network. Several surfaces therefore do not necessarily provide genuine redundancy.

A safe installation should detect invalid information, prevent dangerous asymmetry and allow the system to return to a neutral, manual or otherwise documented safe condition.

What this guide covers

The guide explains:

  • How active ride control reduces roll, pitch and unwanted trim

  • Motion-reference units and acceleration sensors

  • Speed, heading and steering-data inputs

  • Ride-control computers and control algorithms

  • Interceptors and transom-mounted blades

  • Trim tabs and manual trim control

  • Fins, foils and underwater lift surfaces

  • Hydraulic and electric actuators

  • Surface-position feedback and system alarms

  • Cruise, comfort, automatic and manual operating modes

  • Shared power, sensor, hydraulic, network and structural dependencies

  • Monitoring actuator load, surface position and vessel response

  • Common faults including asymmetry, sensor errors and actuator overheating

  • Safe neutralisation, speed reduction and fault isolation

  • Static testing, sea trials and demonstration of safe reversion

Who is this guide for?

This guide may be particularly useful if you are:

  • Considering the purchase of a faster motor yacht

  • Comparing conventional stabilisers with integrated ride control

  • Trying to understand an unfamiliar multi-surface installation

  • Experiencing unexpected trim, list or steering behaviour

  • Investigating sensor, actuator or control-system alarms

  • Reviewing hydraulic, electrical and network dependencies

  • Planning servicing, software changes or equipment replacement

  • Assessing manual trim and degraded operating modes

  • Looking to understand safe operation following a ride-control fault

Questions the guide will help you answer

After reading the guide, you should be better placed to answer:

  • Which motions and trim conditions is the system designed to control?

  • What fins, foils, interceptors or trim tabs are installed?

  • Which sensors provide motion, speed, heading and steering information?

  • Does one motion sensor or controller operate every surface?

  • Are the actuators hydraulic, electric or a combination?

  • Do commanded and actual surface positions agree?

  • What does each cruise, comfort, trim or manual mode control?

  • Are the operating-speed limits for each mode understood?

  • Can manual trim operate independently of the automatic system?

  • Could shared power, hydraulics or network equipment remove all ride control?

  • Are rising current, hydraulic pressure or temperature indicating fouling or actuator wear?

  • Could a damaged seal, interceptor housing or fin penetration create a flooding risk?

  • What happens if one surface becomes stuck or provides incorrect feedback?

  • Can the system be neutralised or isolated without affecting steering or propulsion?

  • Has safe reversion been demonstrated during a representative sea trial?

Download the guide

Gain a clearer understanding of how active ride-control systems coordinate sensors, controllers and moving surfaces, and how the yacht can return safely to reduced or manual operation following a fault.

Download the Free Active Ride-Control Systems Guide
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