The stabilisation-at-rest system developed by the Rolls-Royce
motion control centre of excellence at Dunfermline,
Scotland, is an innovative modification of the Brown
Brothers Aquarius retractable fin stabiliser design.
The Rolls-Royce stabilisation-at-rest system uses a
different fin profile and an advanced control system
that keeps the retractable fins 'active', maximising
their effect in reducing stationary ship motion
The original Aquarius, offering low weight and a simple
operating mechanism is already proven at sea, with over
23 systems supplied since 1999.
Features and benefits
- Safety - fins can be folded away when not required
improving safety for swimmers
- Less drag - with the fin retracted drag is negligible
Improved performance - only a small part of the trailing
edge remains outside the fin box
- Fewer fins - for a typical 60-90m yacht a single
pair of Rolls-Royce retractable stabilisers will deliver
the required roll reduction.
- Compact installation - units normally fit in the
main machinery space
- Quiet - electro-hydraulic actuation for low noise.
At the heart of the system is a new PLC based control
centre with a special control algorithm and an electro-hydraulic
system that senses the start of any roll.
At rest, the fins are 'active' and oscillate at the
maximum angle to generate the reaction load to counteract
the wave motion.
When underway, the system returns the fins to their
normal degree of movement, using the lift forces generated
by the ship's forward speed to damp roll motion.
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