JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 19
trimaran
Lightweight design: key to the Ocean Eagle 43's
rapid acceleration & long-range fuel efficiency
Commissioned by the Mozambique Government,
the Ocean Eagle 43 is an innovation in maritime
surveillance. The three trimaran vessels will conduct multiple missions throughout the Indian
Ocean including anti-piracy operations and the
safeguarding of fisheries, oil, gas and other maritime resources. Sicomin played an integral part in
this challenging project and supplied a range of advanced resin systems during the build programme
that was secured by renowned French shipbuilder,
CMN. The trimaran shells were produced at Chantier
Naval H2X's facility in La Ciotat, France.
A
ll the parties worked
closely to achieve
a truly outstanding
result and the project has
now received the accolade
for being the largest ever
infusion of an epoxy hull in a
single shot.
The trimaran design
In order to effectively
undertake its patrol duties,
the Ocean Eagle 43 must be
able to cruise for many hours
and then accelerate quickly
and pursue. Legendary naval
architect Nigel Irens was enlisted to produce a sleek and
fast design.
"It has taken many years for
the world to warm up to this
design for an efficient surveil-
lance vessel," notes Irens, "but
it is a perfect application for a
trimaran." The long, slender
main hull and diminutive
outer hulls (called amas)
provide exceptional stability, yet are lightweight and
experience a lower amount
of drag than other hull forms
of comparable displacement, including twin-hulled
catamarans.
The laminate design mainly
consists of a glass fibre and
epoxy sandwich construction
- a well proven composite
structure according to Pierre
Lallemand, Head of Composites at H2X. "Everything
is cored and infused, except
for the monolithic areas near
the bottom of the hull at the
Destined for naval duty, the
Ocean Eagle 43's hulls must
be painted grey to reduce
visibility on the horizon, but
unfortunately this means
the hulls will also absorb
significant heat from sunlight.
This made the glass transition temperature (Tg) of the
resin a key concern for H2X.
To achieve a sound solution
to this potential problem,
they drew on their 20-year
relationship with Sicomin
to identify an appropriate
matrix.
specified for the Ocean Eagle
43 was 120°C to140°C, a
carry-over from the initial
design that called for prepreg.
However, that would have
doubled the cost of the resin
and also increased the cost of
tooling and post-cure requirements."
Fortunately, the H2X design
and build teams converted
to a more economical resin
infusion process, allowing
Sicomin to specify a system
with a lower Tg of 90°C.
"Infusion epoxies with a Tg
of 80°C are available but in
our experience this is too low
for dark hulls, risking not only
print-through but a loss of mechanical properties over time
that could result in laminate
or structural failure", states
Denjean.
Sicomin has extensive experience with other multiple
dark-coloured, epoxy-infused
boat projects. Marc Denjean,
Sicomin's Export Manager
comments, "The original Tg
To support this evidence,
Sicomin gathered scanning
calorimetry (DSC) and
dynamic mechanical analysis
(DMA) test data.
With time, the Tg will de-
front of the boat. Carbon fibre was used in the high load
areas such as the stringer caps
and the arms that connect the
amas to the main hull."
The challenge of dark
hulls
The Ocean Eagle 43 and before final painting
No96 April 2015 / jec
composites magazine 19
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015
Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #96 - April 2015
Cover
Edito
Point of view : composites integration
Contents
COMPANY & BUSINESS
China
In brief
JEC Americas
Agenda of Events
APPLICATIONS
Catamaran
RIB
Trimaran
MARKET
Carbon fibre
FEATURE AERONAUTICS
Simulation
Cost-effectiveness
Low cost manufacturing
Thin-ply
High temperature
LFT
Thermoplastics
Laser projection
Release agent
Manufacturing
RESEARCH & DEVELOPMENT
Health Monitoring
Health monitoring techique for large composite structures
TECHNOLOGY & INNOVATIONS
IOT
Braiding
Resin
Vacuum infusion
Machining center
PBT
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Cover
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 2
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Edito
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Point of view : composites integration
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 5
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Contents
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 7
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - China
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - In brief
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - JEC Americas
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 11
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 12
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 13
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 15
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Catamaran
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 17
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - RIB
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Trimaran
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 20
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Carbon fibre
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 22
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 23
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 24
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 25
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Simulation
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 27
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Cost-effectiveness
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 29
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Low cost manufacturing
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 31
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 32
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Thin-ply
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 34
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 35
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - High temperature
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 37
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - LFT
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 39
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 40
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Thermoplastics
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 42
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 43
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 44
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Laser projection
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 46
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Release agent
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Manufacturing
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 49
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 50
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 51
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Health Monitoring
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 53
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 54
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 55
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Health monitoring techique for large composite structures
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 57
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 58
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 59
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - IOT
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 61
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Braiding
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 63
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 64
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Resin
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 66
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Vacuum infusion
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 68
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Machining center
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 70
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 71
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - PBT
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - Index
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - In the world
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 75
JEC COMPOSITES MAGAZINE - Issue #96 - April 2015 - 76
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