Rotor Stabilizer

Retractable Rotor - Zero & Slow Speed

Quantum Marine Stabilizers


The MAGlift™ Rotor Stabilizer Advantage – Applying the Magnus Effect to Boat Stabilizers

Quantum’s team of marine engineers, naval architects and hydraulic system designers understood that a motion control solution for low speed stabilization required a paradigm shift from the traditional fin stabilizer working principle for design and active stabilizer technology. As world leaders in motion control, Quantum takes pride in finding innovative solutions to hydraulic stabilizer challenges. Based on the Magnus Effect, Quantum’s patented MAGLift™ design uses hydraulic power to deploy and rotate composite cylinders directed by the SMC 4000 stabilizer control unit. This advanced technology provides roll reduction at anchor, and at lower speeds.

The MAGLift rotor stabilizer is fully retractable to eliminate drag for higher speeds making it superior to traditional fin stabilizers. The combined swinging and spinning of the rotor result in hydrodynamic forces that stabilize the vessel while it is at Zero Speed™ as well. During underway operations, the rotor is deployed to a set position, and the righting force direction is altered by simply changing the direction of rotor spin. In addition, the MAGLift™ rotor stabilizer has the highest lift to weight characteristics and the smallest interior footprint.

After several years of numerical analysis and tank testing, Quantum installed the first MAGLift™ Rotor System in 2004, applying the Magnus Effect to generate lift proportional to the speed and direction of rotation. To date, several systems have been installed on a variety of military vessels and large yachts ranging in length from 24.3 meters (80 feet) to over 162 meters (525 feet). The use of this technology increases the performance envelope of the vessel and the crew when considerable time in station-keeping or slow patrol speed modes are required.

How the Maglift Rotor stabilizer system works:

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Benefits of MAGlift™
Rotary Ship Stabilizers

  • High damping (also at low speed)
  • System redundancy (each rotor can work independently)
  • Ability to deliver roll stabilization at relatively low vessel speeds (3–18 knots) based upon vessel specifications
  • Compact and easy installation
  • Increased safety and comfort for crew
  • Increased fuel efficiency
  • Underway “Fully Retractable” system
  • Reduced “Haul-Outs” for vessels when using the underway “Fully Retractable” system
  • Reduction in appendage drag at high-speeds utilizing semi- retractable or fully-retractable system
  • High lift to footprint capacity compared to fin stabilization


Simple Installation

The stabilizer unit is delivered fully assembled with minimal disassembly required for installation. Since no customized hull pocket is required for the rotor’s stowed position, complicated hull shape fabrication is avoided.



When properly sized and operating within acceptable vessel speeds, rotor stabilizers provide exceptional hydrodynamic efficiency compared with other stabilizer systems available.

The Underway “Semi-Retractable” Rotor Stabilizer System:

The ML200/300/400SR Series is designed to provide maximum energy transfer in terms of lift force based on the “Magnus Effect.” The unit is a compact rugged design built to withstand the most demanding military and commercial applications.

For maximum roll reduction, the ML Semi- Retractable System is mounted in the turn of the bilge with the rotor oriented perpendicular to the vessel hull during underway operations. The rotor spin direction and speed are altered during operation, as needed, to obtain optimal performance. To minimize appendage drag, the rotor stows neatly, parallel to the vessel hull, when the stabilizers are not in use. The rotor orientation and spin functions are precisely managed by Quantum’s hydraulic and electrical control systems.

Designed using the latest technology and high-quality materials, the ML Semi-Retractable Series system offers the best performance of any system where significant roll reduction is required at loitering speeds.

Smooth Operation: The unit provides smooth power transfer from the ship’s hull to the rotor via precision roller bearings used in both the spin drive shaft and the main shaft.

Precision Control: By varying the RPM and direction of rotation of the tube, the lift force can be controlled with razor sharp precision, resulting in instantaneous response.

Safety: The rotor’s hydraulic system is equipped with an automatic retract mechanism to allow the rotor to swiftly stow in case of impact during operation. While not in operation, the rotor is safely stowed along the hull, where it presents minimal possibility of impact. In case of severe impact, half of the rotor tube will break away, designed intentionally to preserve the integrity of the hull.

MAGLift™ Rotor

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  • Spin Control Manifold
  • Swing Hydraulic Cylinders
  • Swing Drive Housing
  • Hydraulic Spin Motor
  • Servo Control Valve
  • Main Hydraulic Control Indicator

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MAGLift™ (Magnus Effect) Rotor Ship Stabilizers