Exciting New EPS Thruster (& Propulsion)

Discussion in 'Propulsion' started by brian eiland, Nov 16, 2005.

  1. brian eiland
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    brian eiland Senior Member

    Panamax 'super-ketch' will use rim drives

    To be installed on the new Panamax 'super-ketch'

    "It’s not the only movable appendage below the waterline. Like an increasing number of new yachts, the Panamax ketch will take advantage of the advances in diesel electric power generation , in this case designed by MR Fertigung-Technologie GmbH, a German company based in Rostock. This allows the use of two retractable, electrically driven propellers developed by the award-winning Dutch company Van der Velden. By swinging or retracting the props into the hull the yacht's underbody will become perfectly flush when sailing, further enhancing -performance

    Instead of using a conventional engine for propulsion, the Panamax will befitted with a number of generating sets (the likelihood is four) which, as Erik Wassen put it: “Will provide a power sharing opportunity with a priority system.”

    In other words the generating sets will automatically deliver power to the numerous systems precisely when they want it and at sufficient levels, whether it be the hydraulic pumps for the big winch packages, domestic power to run the hotel systems or power for propulsion. Heavy battery banks are limited to emergency sets.

    The generating system can devote all its energy to the retractable hubless props—the blades of the propellers are set on the inner surface of the circular units, which house the electric motors themselves instead of on a central hub."


  2. masalai
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    masalai masalai

    When will a 10kw size be available for yachts, An electrically powered pair would be neat mounted on a swing up arm for my cat... particularly if capable of 'regen' use too - needs to be at a reasonable/competitive price - to 'partially' compete with the standard diesel drive systems.

    I do not think I will be holding my breath waiting in anticipation...
  3. Guillermo
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    Guillermo Ingeniero Naval

    Ron Holland designed Royal Huisman's "Ethereal", scheduled for delivery this year, has been equipped with two Van der Velden's 132 kW EPS 800. It is the first installation of its kind.


  4. brian eiland
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    brian eiland Senior Member

    Brunvoll news

    The development project of Rim Driven Thrusters continues. Design, production and testing of our prototype of 100 kW since 2003, has brought us
    invaluable experience to use as we go further with our development. We also completed additional tests on this prototype in 2006.

    The first of our larger units is scheduled to be delivered in 2007 for an offshore support vessel. This is an 810 kW tunnel thruster and is quite a departure from the first prototype.

    To supplement experimental data for this type of design, adcanced design tools are applied. One of these is Computational Fluid Dynamics (CFD). This is a tool with direct integration with our 3D CAD/CAE tools and the flow calculations can include viscosity effects, turbulent flow and cavitation.
  5. brian eiland
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    brian eiland Senior Member

    Sea Jet's RIMJET, Advanced Electric Ship Demonstrator (AESD)

    The Sea Jet Advanced Electric Ship Demonstrator (AESD), funded by the Office of Naval Research (ONR), is a 133-foot vessel located at the Naval Surface Warfare Center Carderock Division, Acoustic Research Detachment in Bayview, Idaho. Sea Jet - built by Dakota Creek Industries in Anacortes, Wash. - operates on Lake Pend Oreille, where it is used for test and demonstration of various technologies. Among the first technologies tested was an underwater discharge waterjet from Rolls-Royce Naval Marine, Inc., called AWJ-21, a propulsion concept with the goals of providing increased propulsive effiency, reduced acoustic signature, and improved maneuverability over previous Destroyer Class combatants.

    In a program of research and development which was years in the making, Office of Naval Research (ONR), Rolls Royce Naval Marine Inc. (RRNMI), and the Signatures Department (Code 70) prepared the demonstration of an advanced waterjet-based propulsion concept, named AWJ-21. RRNMI, Walpole, MA, has developed the AWJ-21 propulsor concept with the goals of providing increased propulsive efficiency, reduced acoustic signature, and improved maneuverability over DDG 51 Class combatants. For this demonstration, a 130-foot-long craft designated the Advanced Electric Ship Demonstrator (AESD) was built. The AESD is being funded by ONR to demonstrate advanced electric ship and propulsor technologies. The ground-breaking demonstration is sponsored by the Office of Naval Research. Additional benefits from the AWJ-21 technology are expected to provide more compact propulsion systems with reduced weight and volume.

    The AESD is an approximate quarter-scale destroyer class combatant with a length of more than 133 feet and a full load displacement of 120 tons [239,000 pounds]. The AESD hull form is based on the 5565 tumble-home hull tested early in the DD(X) program. As a result of availability of the AESD demonstrator craft, planning is underway to conduct other technology demonstrations. One such effort is the design of a low signature deckhouse for the model.

    On 30 November 2005 the Advanced Electric Ship Demonstrator (AESD), Sea Jet, tied-up to the pier after completing its first day of sea trials on Lake Pend Oreille at the Naval Surface Warfare Center Carderock Division, Acoustic Research Detachment in Bayview, Idaho. The ship would test Rolls-Royce patented AWJ-21™ waterjet technology over the following six months on Lake Pend Oreille at the Navy’s Acoustic Research Department in Bayview, Idaho. The AWJ-21 is designed to increase ship speed, making hulls sleeker by working without rudders, shafts and propeller struts. Unlike conventional waterjets, the system works completely underwater, reducing noise and surface wake and improving stealth. The lightweight and compact AWJ-21 allows ships to operate in shallow waters. Its integrated steering and reversing system improves maneuvrability at low speeds.

    Carderock Division’s Acoustic Research Detachment in Bayview, ID, is where most of the testing commenced in FY 05. Members of Philadelphia’s Code 90 supported machinery and electric drive quieting for the AESD. General Dynamics Electric Boat division similarly applied its expertise to the electric drive propulsion system. ARL at Penn State provided test support for the early waterjet development, and MIT assisted with the waterjet pump design. Computer Sciences Corporation (CSC) is responsible for the overall AESD boat design.

    The RIMJET is a novel type of podded propulsion system that relies on a permanent magnet motor to drive the propeller, making it similar to the systems featured in this issue of Solutions (p32). In the RIMJET propulsor the motor is mounted not in the hub but in the rim, which GD Electric Boat believes provides a number of advantages. One of these is that because the RIMJET makes use of the same hydrodynamic principles as a waterjet, its applicability to high-speed vessels is much greater than conventional propulsors. Advantages over waterjets include high rotor torque capacity, rim attachment of rotor blades, minimal hull contour impact and azimuthing capability. The RIMJET’s high efficiency derives from its use of a phenomenon known as swirl recovery. Moreover, because it operates at a relatively low rpm, blade area is reduced, there is minimal duct and strut surface area, and the propulsor has low duct and strut velocities compared to hub-driven propulsors. The RIMJET has excellent cavitation performance because it operates at low rpm, it has very uniform inflow to the rotor, and the rim prevents the formation of tip vortexes. General Dynamics believes the RIMJET will also have better ‘off-design’ performance characteristics because the duct provides uniform mass-flow at off-design conditions.

    It also promises to be much more reliable and maintainable than hub-driven pods. GD Electric Boat says the ‘canned’ permanent magnet motor at the heart of the RDP and stator are both sea-water cooled, eliminating the need for a cooling system and anti-condensation heating system. Having a seawater-lubricated journal and thrust bearings removes the need for a bearing lubrication system and seals, and having the strut outside the propeller wake reduces cavitation erosion. The duct also shrouds the ship’s hull from blade-induced pressure fluctuations.

    Attached Files:

  6. brian eiland
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    brian eiland Senior Member

    Ethereal launched with Hubless Thrusters

    This is Ethereal, a Ron Holland-designed 190ft ketch just launched from Royal Huisman in The Netherlands for Americans Bill and Shannon Joy. Just another superyacht, you may say, but this yacht's hybrid power system represents something very different and this unusual picture of her seemingly gliding across a 'sea' of green is significant.

    She is seen here manoeuvring along the Dutch canal system en route to the open sea for trials where her she was put through her paces at 10 knots under power with no internal combustion engine in use. Instead she was using her lithium battery bank of 400kWh, designed to keep her running for a day with most of her onboard systems in use too. These batteries drive a Combimac electric motor/generator which rotates the shafts and then charges the battery bank when the yacht's more conventional twin Caterpillar 533kW diesels are brought into play.

    She also has two 177hp electric Van der Velden hubless thrusters which can turn the yacht through 360 degrees in just 1min 40sec, not bad for a yacht weighing almost 500 tons!

    According to Mike Koppstein of Huisman, who we talked to at the Fort Lauderdale Boat Show yesterday, the silent running mode is quite unnerving with no engine noise or vibration while 'motoring' with electric power. The same goes for the hubless electric thrusters.

    Ethereal is currently undergoing sea trials in the North Sea and we hope to bring you a more detailed report in the pages of Yachting World in an upcoming issue.

    Attached Files:

    1 person likes this.
  7. kistinie
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    kistinie Hybrid corsair

    About small sized thrusters, for small boats, this below seems to belong to the same family ?
    IntegratedThruster is a trademark of the University of Southampton. Products developed under licence by TLS.


    Attached Files:

  8. brian eiland
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    brian eiland Senior Member

    What's Up ?

    It appears as though some of this development work on both the trusters and the propulsion units has stalled out along with the world's current economy.

    I went looking today for some updates, and here are a few items I found along the way:





  9. Tackwise
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    Tackwise Member

    As I am interested in the development of this new technology, I also try to follow any news on the subject. As far as I have gathered the following companies are busy with it:

    Brunvoll: Rim Driven Thruster (RDT)
    Power range & diameter: 200-900 kW & 800-1750 mm
    Bowthruster: Allready installed some on one or more supplier ships
    Main propulsion unit: They were going to install their first RDT as main propulsion unit on a Norwegian ferry. This ferry was scheduled to be delivered this month (august 2010).
    The bow thruster version has been put on the market, however they are reluctant with their propulsion unit (no drive time experience) Hopefully this will change with the ferry!

    van der Velden: EPS thruster
    Power range & diameter: 90-295 kW & 650-1050 mm
    Bowthruster: Installed on several yachts
    Main propulsion unit: Under development
    Rumour has it they have run into some problems with their unit.

    Voith: Inline thruster/propulsion (VIT/VIP)
    Power range & diameter: 5.5-300 kW & 240 -850 mm
    Seems that they are in the progress of upgrading their range to include higher power and diameters!
    Bowthruster (VIT): Several tugs
    Main propulsion unit (VIP): Amsterdam canal boat (with fuel Cell technology)

    Rolls Royce:
    Power range & diameter: ~850 kW & ???
    Bowthruster: Installed on one or more Supplier ships
    Main propulsion unit: unknown
    Still in development stages therefore not fit for marketing (in otherwords their sales department do not get informed on the possibilities)

    TSL technology
    Power range & diameter: ??? & 50-300mm
    Main propulsion unit: application on ROV's

    Klingenburg: Prop-eye
    Fleetwater marine: Ring driven thruster
    G-tec: ring prop
    Schilling: (ring thruster) (ROV)
  10. brian eiland
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    brian eiland Senior Member

    Thank you Tackwise for that summary/update.
  11. M. Himes
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    M. Himes New Member

    Rim Thruster Rolls-Royce AWJ-21

    Has Rolls-Royce computed the advantages of coaxial high by pass (Coanda Effect) flows? A magnetohydrodynamic axial vortex flow aguments the central rim thruster flow to both increase volume and flow rate of the thruster. Given this combined flow electric thruster for submarine propulsion seems to provide low acoustic signature and very low power consumption.
  12. brian eiland
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    brian eiland Senior Member

    First ship with Azimuth Rim Driven Thrusters/Propulsion

    The M/F Eiksund, a RoRo car and passenger ferry of LOA 160 ft (49 m), beam 34.7 ft (10.6 m) and draft 10.2 ft (3.1 m) was built in 1970 and originally powered by a single Wichman 552 kW (750 hp) diesel engine with mechanical drive to two propellers.

    She has been repowered with a new propulsion system consisting of two new diesel engines driving Permanent Magnet (PM) generators and two Brunvoll RDT1500 azimuth RDT which is the world’s first commercial application of this type of drive. Control and management of the generators and propulsion system is provided by Inpower, Norway.


    Attached Files:

  13. brian eiland
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    brian eiland Senior Member

    Passenger Vessels and Yachts to Use Voith Thrusters

    Voith currently is the only manufacturer world-wide to produce thrusters with a power of 1 500 kW based on permanent magnet synchronous machine technology (RIM drives). Recent orders for offshore applications, passenger vessels and yachts underline Voith’s position as global market leader for these systems.

    Attached Files:

  14. MechaNik
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    MechaNik Senior Member

    Ocean Yacht systems are offering a rim drive thruster now too, possibly someone elses design to start with. http://www.oceanyachtsystems.co.uk/thrusters/rim-driven-thrusters
    The difference here is that they use a more conventional prop with a centrally supported thrust bearing. This could be key in resolving long term thrust support issues when used as primary propulsion.
    Four sizes 15,48,133 and 260kw in various formats.

  15. brian eiland
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    brian eiland Senior Member

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