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Hamble Point Marina, School Lane, Hamble
Southampton, SO31 4NB
United Kingdom

023 8045 6450

Osmotech is one of the UK's leading suppliers of bow and stern thrusters, stabilizers, marine systems and passerelles and gangways. 



Seakeeper are the world's leading brand of gyroscopic stabilizers and Osmotech are the authorised dealer on the South Coast. We have been retro-fitting them to all sizes of craft for many years, so please do get in touch to discuss how we can help eliminate your boat's roll.  

Scroll down to see the product range, FAQs and videos.

To get more information and technical specifications, click on the models below.


What is required to install the gyro?

Installation of the gyro requires roughly the same level of complexity and effort as installing a generator. A key component of the installation is the design and construction of the mounting stringers which must be capable of safely transferring the gyro's torques to the hull structure. AC and DC power and sea water must be connected to the unit. Wiring also must be installed between the control box and the key/display control unit mounted at the helm.

How much heat does the gyro produce?

Depending on Seakeeper model, the gyro produces 1-5kw of heat during normal operation. The majority of this heat is dissipated by the cooling loop.

How much noise does the gyro make?

The steady state noise of each gyro is measured in our factory test room at distance of 1 meter from the sphere and depending on model will measure 68-75 dBC unweighted. This sound pressure level will be 2-3 dB lower on the A scale that is typically used to rate marine machinery noise. The steady state noise is the sound pressure level associated with spinning the flywheel without precession as if you were sitting at the dock or at anchor with very little or no wave motion. As the frequencies emitting the highest sound pressures are low (like other marine machinery), it is recommended that the gyro be installed in a machinery space that is treated with soundproofing. If the gyro stabilizer is located outside a machinery space, soundproofing may be required to eliminate low frequency noise from entering living spaces.

What maintenance needs to be done on the gyro?

The gyro is designed to require minimal maintenance as most of the critical parts operate in a sealed environment. External of the sphere, the closed loop hydraulic circuit and cooling circuit should be periodically inspected and serviced per the operating manual provided with the unit.

Where does the gyro have to be located in the boat?

From a theoretical perspective, the Gyro Stabilizer can be located anywhere in the boat hull. From a practical perspective, Seakeeper strongly recommends that the Gyro Stabilizer be installed aft of amidships to minimize vertical accelerations due to wave impacts. 

What is the advantage of Seakeeper’s active control?

Unlike passive control, which must be optimized for a particular level of wave energy, active control permits the gyro to exert its full torque over a range of sea states. A passively controlled gyro must be turned off in the roughest conditions to keep from damaging itself, whereas the Seakeeper Gyro can continue to operate when it is most needed.

How does the gyro work?

The Seakeeper product is a “Control Moment Gyro” or CMG and employs the physics of gyro-dynamics. The unit has a heavy flywheel that spins at high speed in a near vacuum, thus virtually eliminating air friction and allowing weight and power consumption to be minimized. The flywheel’s angular momentum produces a gyroscopic righting torque that counteracts any boat roll. The unit also includes an active control mechanism which optimizes the gyro’s performance over a wide range of sea states.

What is the advantage of spinning the gyro in a near vacuum?

Until the Seakeeper Gyro, air friction was the limiting factor on how fast the flywheel could be spun, driving up flywheel weight and power requirements. The Seakeeper Gyro spins ~ three times faster than comparable products, cutting flywheel weight by two-thirds and halving power requirements. Moreover, because the critical components (flywheel bearings and motor) are sealed for life in a near vacuum containment, they are forever isolated from the marine environment. In addition, cooling requirements are less, both because there is less heat and it is easier to dissipate.

Need to know more? Call Mike today 02380 456450