Hull Units for Fins & Rotors

Stabilizer Hull Units

A major component for fin and rotor stabilizer function. The hull unit acts as an intermediary between the control algorithm commands and the hydraulic power system, enabling precise fin or rotor movements for optimal stabilization. The hydraulic cylinders on the top of the hull unit rotate the main shaft, which deflects the fin or rotor to move exactly as directed by the control system.

Get in Touch

The hull unit acts as an intermediary between the control algorithm commands and the hydraulic power system, enabling precise fin or rotor movements for optimal stabilization. The hydraulic cylinders on the top of the hull unit rotate the main shaft, which deflects the fin or rotor to move exactly as directed by the control system.

Quantum Hull Units

The hull unit is installed at the turn of the bilge with the main shaft penetrating the hull, acting as a energy transfer device between the hull unit and the fin or rotor which are positioned under the waterline of the vessel. The installation is managed through the supplied welding bushing.

The main shaft features a tapered hydraulic expansion coupling for the secure attachment of the fin, and a spline connection to the tiller and hydraulic cylinders. These precise machined components promote a smooth transfer of energy from the hydraulic cylinders to the stabilizer fin.

New Rack & Pinion Hull Unit – “R Series ”

Quantum capitalized on their experience and service history with the MAGLift™ Rotor – Rack and Pinion System to then re-engineer and advance the R Series technology. Through complex Computational Fluid Dynamics (CFD) studies, Finite Element Analysis (FEA) and independent model testing, this new system was refined resulting in significant service and performance advantages.

Technical Specs

Rack & Pinion Technical Specifications

	HU2200R	HU2500R	HU3600R
Typical Vessel Length*	55-105m (180-345ft)	75-130m (246-427ft)	90-145m (300-475ft)
Fin Size Range**	4.5-7.0m² (48-75ft²)	6.0-9.5m² (65-102ft²)	10.0-15.0 m² (107-161ft²)
XT™ Fin Size(s) Available	7.0x9.1m² (75x98ft²)	9.5x12.3m² (102x132ft²)	11.5x15.0m² (124x161ft²)
Length (including centering bolts)***	972mm (38”)	1189mm (47”)	2740mm (108”)
Width***	1687mm (66”)	1962mm (77”)	1213mm (48”)
Height (overall)***	2006mm (79”)	2132mm (84”)	3006mm (118”)
Height (inside vessel after install)***	1312mm (52”)	1282mm (50”)	1907mm (75”)
Weight (dry)***	1673kg (3688lbs)	2494kg (5498lbs)	5142kg (11336lbs)

Key benefits of the Rack & Pinion Hull Unit

Improved Maintenance Schedule

The shaft is fitted with roller bearings, both top and bottom that have an estimated 15,000 hour replacement schedule, significantly extending the time between haul outs and reducing maintenance costs.

Lower Maintenance Costs

The hydraulic cylinders can be rebuilt in place, eliminating the very challenging cylinder removal process. This single feature, represents significant savings:

it greatly simplifies the cylinder maintenance process
it reduces the service and down time of the vessel
it results in much lower maintenance costs

Improved Zero Speed Performance

In certain applications, the increased swing capacity, up to 45 degrees in each direction, can greatly improve zero speed performance.

Higher Security

The hydraulic locking mechanism provides double security for locking the fin and shaft in place when the system is not in use or while being serviced, even out of the water. In case of an emergency, there is a manual locking pin.

Easy to Retrofit

The compact design and mounting arrangement is perfect for retrofits to either upgrade or replace other existing systems.

Quieter Operations

With four pistons and dual racks, it exerts the full range of motion with constant torque on both sides of the gear wheel, equating and quieter operations and greater efficiencies.

Fin Stabilizer Hull Units

Fin Hull Units

Standard Hull Units

Compact yet powerful, the standard hull units deliver reliable roll reduction across a wide range of vessel sizes, combining rugged construction with dependable performance, straightforward installation, and low maintenance.

Electric Hull Units

Especially designed for electric e-FIN systems, the electric hull units deliver exceptional energy efficiency, responsiveness, and durability. Their rugged bearing housings ensure smooth operation and extended maintenance-free hours, providing advanced stability for larger yachts and commercial vessels.

Technical Specs

Hull Units Technical Specifications

	HU1200	HU1500	HU1800	HU2200	HU2500	HU3000	HU3600	HU4000
Typical Vessel Length*	30-45m (100-150ft)	36-50m (120-165ft)	45-60m (150-200ft)	55-65m (180-215ft)	62-101m (203-331ft)	80-110m (260-360ft)	90-145m (300-475ft)	115-200m (377-656ft)
Fin Size Range**	1.4-2.5m² (15-27ft²)	1.5-3.5m² (16-38ft²)	2.7-5.0m² (29-54ft²)	3.8-7.0m² (41-76ft²)	5.4-8.5m² (58-92ft²)	7.0-10.5m² (75-115ft²)	10.0-15.0 m² (107-161ft²)	10.0-18.0 m² (107-194ft²)
XT™ Fin Size(s) Available	1.2 x 1.6m² (13x17ft²)	3.0 x 4.1m² (32x44ft²)	4.0 x 5.2m² (43x56ft²)	6.0-7.8m² (65x84ft²)	8.0x10.8m² (86x116ft²)	10.0x13.0m² (107x140ft²)	11.5x15.0m² (124x161ft²)	14.7x19.2m² (158x207ft²)
Length (including centering bolts)***	1145mm (45”)	1220mm (48”)	1550mm (61”)	1740mm (69”)	2014mm (79.3”)	2600mm (102”)	2740mm (108”)	2865mm (113”)
Width***	440mm (17”)	480mm (19”)	640mm (25”)	660mm (26”)	825mm (32.5”)	1060mm (42”)	1213mm (48”)	1390mm (55”)
Height (overall)***	967mm (38”)	1159mm (46”)	1461mm (57”)	1747mm (69”)	2265mm (89”)	2690mm (106”)	3006mm (118”)	3025mm (119”)
Height (inside vessel after install)***	637mm (25”)	768mm (30”)	926mm (37”)	1052mm (41”)	1423mm (56.1”)	1680mm (66”)	1907mm (75”)	1906mm (75”)
Weight (dry)***	306kg (675lbs)	399kg (880lbs)	952kg (2098 lbs)	1372kg (3025lbs)	2122kg (4678 lbs)	3717kg (8195lbs)	5142kg (11336lbs)	6122kg (13497lbs)

* All reference to hull unit capacity by vessels LOA is for generalization purposes only. Fin to hull unit sizing is for reference only. For actual sizing please contact Quantum. In addition to our standard hull unit sizing and fin configurations, Quantum also builds custom designed units and fins for series applications.

Key Advantages of Hull Units for Fins & Rotors

Simple Installation

The stabilizer unit is delivered fully assembled with minimal disassembly required for installation.

Smooth Operation

The unit ensures a smooth power transfer from the ship’s hull to the rotor through precision roller bearings integrated into both the spin drive shaft and the main shaft. The precise fit enables efficient energy to move from the hydraulic cylinders to the stabilizer.

Precision Control

By varying the RPM and direction of rotation of the rotor or tube, the lift force can be controlled with razor sharp precision. Similarly, with a fin, the main shaft features a tapered cut for a powerful stabilizer fin connection utilizing hydraulic cone expansion for a press fit.

Efficiency

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

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 elegantly stowed along the hull, where it presents minimal possibility of impact and minimal effect during maneuvering conditions. In case of severe impact, half of the rotor tube will break away, in a design feature intended to sacrifice the rotor unit in order to preserve hull integrity.

ML Rotor Retractable Hull Units

Discover the ML Series

The ML Hull Units deliver precise roll reduction with exceptional hydrodynamic efficiency. Their rugged, compact hull housing with precision bearings ensures smooth, responsive operation, while advanced controls and safety features provide reliable performance. The rotor stows neatly against the hull when not in use, minimizing drag, protecting the hull, and reducing maintenance needs.

Technical Specs

ML Hull Units Technical Specifications

	ML220	ML380	ML460	ML540
Typical Vessel Length (for a pair)	25-45m (80-150ft)	40-60m (130-200ft)	55-90m (180-300ft)	75m-115m (250-380ft)
Max. Underway Operating Speed	14 knots	14 knots	14 knots	14 knots
Rotor Dimensions (⌀ x L)	229mm x 1510mm	380mm x 2660mm	380mm x 2660mm	540mm x 3780mm
Angular Travel (Total Operational)	120°	120°	120°	120°
Dimensions (L x W x H) (inside vessel after installation)	876mm x 315mm x 615mm	2110mm x 1085mm x 870mm	3488mm x 1176mm x 1346mm	2758mm x 1172mm x 1322mm
Weight (Dry)	473kg	3651kg	6925kg	8742kg

Hull Unit FAQ

How is a Quantum Hull Unit installed and maintained?

The installation is managed through the supplied welding bushing. The main shaft features a tapered hydraulic expansion coupling for the secure attachment of the fin, and a spline connection to the tiller and hydraulic cylinders. These precise machined components promote a smooth transfer of energy from the hydraulic cylinders to the stabilizer.

The hull unit is simple to maintain during normal operation, with stainless steel components used to minimize corrosion. Internal porting is built in, providing grease points that are accessible from inside the vessel, making routine maintenance easier. The unit is designed for replacement of the lower seals and bearings during regular scheduled docking. All other internal maintenance and service work can be accomplished with the vessel in the water.

Do all Hull Units support XT Fin Upgrades?

Do Quantum Hull Units have Safety Features?

For safety and emergency operations, all Quantum hull units are equipped with centering cylinders. These cylinders engage the tiller and have the capacity to center and lock the fin in the mid position should there be a failure of the main cylinders, hydraulic power unit or control system. The cylinders can be deployed from the main power unit or if required, can be deployed using a manual hand pump.