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catastrophes Hydrographic survey boat Cassiopée
Cassiopée
HYBRID HYDROGRAPHIC SURVEY BOAT LAUNCHED IN LA ROCHELLE
NEW HYDROGRAPHIC SURVEY BOAT IS POWERED BY INNOVATIVE HYBRID PROPULSION AND USES UPGRADED SURVEY EQUIPMENT TO MAP THE UNDERWATER LANDSCAPE AROUND THE PORT OF LA ROCHELLE.
ALL PHOTOS COURTESY OF TORQEEDO.
Alumarine Shipyard has delivered a new hydrographic survey boat that is powered by an innovative dual electric/ diesel propulsion system to the Port of La Rochelle. The 8m aluminium Cassiopée will provide bathymetric surveys of the ocean floor to collect data that will be used to map the underwater landscape, ensuring safe navigation in and around the port. The high-speed vessel has been designed to the specifications of the team at La Rochelle. The shape of its hull is suited to the sea conditions in the area and offers the required stability during survey work. Its deck plan and equipment allow the crew to work in comfort and safety, and workspace has been optimised in the wheelhouse. The choice of aluminium for this construction
was immediately obvious, according to Philippe Texier, Head of the Maritime Access and Land Infrastructures at the Port of La Rochelle. “In addition to being light and robust, it is a material that allows tailormade solutions and changes at a later stage, unlike a polyester hull on which future alterations are more complex.”
Innovative dual drive One of the vessel’s special features is the hybrid propulsion system, supplied by Torqeedo. The company worked closely with the naval architect and shipyard to specify, install, and integrate an electric propulsion package consisting of two Cruise 10.0 R electric outboards, each powered by four Power 48-5000 lithium batteries. It also
Construction Alumarine Shipyard Design Bemad Naval Overall length 8.13m Overall width 2.98m Draught 0.91m Maximum draught <1.00m Light displacement: 3.4t Crew 5 people Propulsion 1 Volvo D4 225hp diesel inboard engine, z-drive base 2 electric Torqeedo Cruise 10.0RL outboard motors
Data acquisition speed Transit speed Diesel capacity Certification Flag
3-7 knots 20-25 knots 240l Bureau Véritas French
Cassiopée can sail at 20-25 knots under diesel power between the port and acquisition area, shifting to the electric outboards while performing scans of the seafloor.
Torqeedo supplied an electric propulsion package consisting of two Cruise 10.0 R electric outboards, each powered by four Power 48-5000 lithium batteries.
The two electric motors will allow the vessel to work in silence and without any impact on the environment.
includes an intelligent Battery Management System that automatically monitors all components and communicates with the onboard computer. Cassiopée is designed to sail at 20-25 knots under diesel power between the home port and acquisition area, then shift to the electric outboards while performing scans of the seafloor. The two electric motors will allow the vessel to work in silence and >>
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New hydrographic survey boat Cassiopée will provide bathymetric surveys of the ocean floor.
without any impact on the environment. “The dual-mode propulsion system gives the best of both worlds: high-speed transits to maximise uptime on station and efficient, emission-free slow-speed operation for long periods when conducting an underwater survey,” comments Cassiopée Captain Franck Souchay. “The vessel operates on electric power at a speed of five knots for six hours, which perfectly covers our needs in electric mode on a working day. Then the batteries are recharged at the pier during the night.” Torqeedo CEO Dr Christoph Ballin adds that his company is proud to be part of this project. “From deep ocean science to hydrographic survey boats like Cassiopée, electric research vessels are a growing market for Torqeedo. Reduced engine vibration and noise mean better data and clearer results.”
Precise survey equipment The interior layout consists of three spaces: the wheelhouse, the hydrography station, and the workstation. The entire wheelhouse is insulated, equipped with heating and glazed to provide the crew with a 360° view of the exterior and aft deck. Cassiopée is equipped with a new multibeam echosounder supplied by geosciences systems specialist Cadden, which replaced the single-beam system used previously. The new sounder will provide more precise data. Instead of carrying out a scan of the seabed on a series of points as before, the sounder will perform a continuous scan over a width of up to five times the water height: 10m of water height represents 50m of continuous measurement width. “The data collected will be all the more precise, making it possible to refresh the bathymetric maps of the Port more regularly, while simultaneously being in compliance with the International Hydrographic Organisation standards”, states Mr Texier.
