Stabilisers
Retractable-fin stabilisers
The Neptune II retractable-fin ­stabiliser
provides o
­ ptimal vessel performance at
low ownership costs.
Retractable stabilisers
Neptune II retractable-fin stabilisers
Retractable fin stabiliser systems play an important role in
­improving the all-important on board experience for passengers
and crew. They are supplied in pairs, but can be used singly if
­required. When not in use they retract into recesses in the hull, flush
with the vessel’s side. Vessel speed and the angle of the fins in the
water determines the degree of lift generated and the subsequent
level of roll reduction. The control system senses ship speed and the
degree of ship movement and alters the fin angle to provide the
necessary lift to return the vessel to an even keel. Compared to an
unstabilised vessel, these systems provide 80-90% roll reduction.
The one-piece fin is built of fabricated materials, with a m
­ odified
NACA (North American Committee on Aeronautics) section to
maximise lift properties and minimise drag, with a similar effect as
flapped fins.
Features include an innovative tilt ram attribute, which facilitates­
­cylinder and seal maintenance w
­ ithout dry-­docking, simplified
crux assembly, improved hydraulic and ­lubrication systems, lower
weight and a new fin extension-locking m
­ echanism for improved
­safety. Neptune II offers optimal vessel p
­ erformance with low
­ownership costs.
Key product benefits
Typical applications:
Technical data, Neptune
­retractable-fin stabilisers
• Enhanced stabiliser ­performance due to one-piece, high-lift fin
• Ease of integration with ship’s alarm and m
­ onitoring system
• Small hull aperture
• Modular construction
• Simplified main seal ­replacement
• Load sensing hydraulics
• Latest generation controls
• Cruise ships
• Ferries
• Container vessels
Neptune Fin area Total weight
model(m )(tonnes)
Medium to large naval
vessels:
• Aircraft carriers
• Amphibious vessels
• Auxiliary platforms
18
2
200
300
400
500
600
5.45 – 7.48
44 – 52
7.00 – 9.62 67.5 – 78.1
9.42 – 12.95 90.0 – 102.5
12.5 – 17.19 127 – 142
16.24 – 22.33 190 – 209
All data subject to change without
prior notice.
Aquarius can boast terrific stabiliser
performance, thanks to its one-piece,
high-lift fin.
Aquarius retractable-fin stabilisers
Typical applications:
The Aquarius folding-fin stabiliser range gives high-­performance
roll damping, with a compact, lightweight design and
­state-of-the-art controls. The fin ­operating m
­ echanism is
­especially ­configured to meet the requirements of smaller ­vessels,
with minimum size, weight and ­number of parts. The ­stabiliser
comes s­ upplied ­complete with a fin-box and any ­necessary local
­stiffening, ready for the shipyard to weld into place.
• Large motor yachts
• Small cruise ships
• Passenger ferries
• Small naval and coast guard vessels
Technical data, Aquarius
­retractable-fin stabilisers
Key product benefits
• Enhanced stabiliser ­performance thanks to the one-piece high-lift fin
• Low installation costs for hydraulic, ­mechanical and control equipment
• Ease of integration with ship’s alarm and ­monitoring s­ ystems
• Small hull aperture
• Linear actuators for fin tilt and ­extension
• Integral lubrication ­system
• Fin-box can be shipyard ­supplied
• Load sensing hydraulics
• Latest generation ­controls
Aquarius Fin area Total weight
model(m )(tonnes)
2
25
50
100
1.06
1.41
1.76
2.05
1.82
2.42
3.03
3.51
4.21
4.73
5.26
5.78
9.7
10.0
10,3
10.8
19.3
19.8
20.3
20.8
35.5
37.0
39.0
40.2
All data subject to change without
prior notice.
19
Stabilisers
Stabilisation-at-rest
When the fins are fully retracted, only a
small part of the trailing edge remains
outside the finbox (Aquarius variant
shown).
Stabilisation-at-rest
Key product­benefits
The stabilisation-at-rest system uses the proven and reliable
Aquarius and Neptune ranges of retractable stabilisers. The
system is ideal for medium to large yachts and is the world’s
first to be made available with the benefits of retractable fins.
• Rolls-Royce retractable stabilisers will deliver the r­ equired
roll reduction with only a single pair of fins
• Fewer components and the sub-systems means r­ eliability,
and availability, with less maintenance
• Units normally fit into the main machinery space, with
­simple access for r­ outine maintenance
• Electro-hydraulic actuation for low noise
The fins can be folded away when not required to improve
safety, maintain manoeuvrability in confined spaces or
when travelling at high speed. With the fin retracted drag is
­negligible, and compared to the industry standard there is also
less fin drag in the working condition.
“Active” fin control and advanced hydrodynamic design give
outstanding roll reduction at anchor and the usual excellent
performance whilst underway.
Technical data, Aquarius SAR
retractable fin stabilisers*
Aquarius Fin area Approx. model(m )weight/ship
set (tonnes)
2
25
50 100
200
300
20
Up to 4.0
Up to 6.1
Up to 9.0
Up to 12.0
Up to 15.0
13
24
42
50
75
Typical applications:
• Medium to large yachts
50-100+ meters
Stabilisers
Non-retractable stabilisers
The Gemini range of stabilisers are suited to
­commercial vessels and military vessels with
­minimal or no military/naval specifications.
The modular type of ­stabilisers meet military
standards for noise, shock and vibration levels.
Gemini non-retractable stabilisers
Modular stabilisers
For applications where retraction of the fins is not required,
the Gemini range is available for smaller vessels where high
­performance and low cost are important factors. The Gemini
range of non-retractable stabilisers are supplied with a plain,
high p
­ erformance fabricated fin. Gemini stabilisers provide high
performance roll damping with a compact, lightweight design
and modern controls, as well as ­proving highly dependable with
low mainte­nance costs. The power unit is compact, incorpo­
rating pumps, motor, proportional control valves and cooler, and
the range can be supplied with or without a hull plate to a
­ llow a
balance of cost against ease of installation.
The modular stabiliser range incorporates superior
­hydro­dynamic features, and is designed to satisfy standards
for noise, shock and vibration where these are required to meet
­customer military/naval specifications. A keyless taper socket
fin attachment allows the hydro­dynamic­profile of the fin blade
to remain u
­ nbroken, ­reducing the potential for cavitation. If
­required, air ­emission from the l­ eading edge of the fin can
also be ­utilised to minimise noise i­ nduced by cavitation. The
hull-closing plate is an integral part of the fin unit. I­ nstallation
is easy, as the unit is shaped to fit the hull l­ ines exactly, so
­e­xpensive seating s­ tructures and finishing work can be avoided.
Key product­benefits
Key product­benefits
• Enhanced stabiliser performance due to high-lift fin
• Compact power unit containing all the hydraulic,
­mechanical and control equipment
• Ease of integration with ship’s hull and systems
• Self-aligning bearings
• Special finshaft coating
• Simple installation ­procedure
• Fin size tailored to meet the design and perfor­mance of
individual ships
• Low maintenance
Technical data, Modular range*
Model Fin areaDesign Weight
(m ) speed (tonnes)
(knots)
2
Technical data, Gemini
folding-fin stabilisers*
Gemini Fin area
Total
model
(m )weight
(tonnes)**
2
10
20
30
1.4
2.0
3.2
3.42
5.71
10.16
NR22
NR26 NR30 NR35 NR41 Typical applications:
• Large motor yachts
• Fast ferries
• Small naval and­
­coastguard vessels
*All data subject to change without prior notice. **Weight includes optional hull plate.
21
1.9
2.9
3.5 4.8 5.0 6.5
7.0 9.0
9.5 12.0
13.0
16.5 30
19 27 19 27 19
26
19 25 18 25
18
6.8
8.4
9.04
12.2
14.4
18.6
21.1
26.6
29.9
36.72
42.4
52.1
Typical applications:
• Corvettes & patrol vessels
• Frigates
• Destroyers
• Auxiliaries