Feature 2 | PROPELLERS & THRUSTERS
improve sailing economy with a twin- or multiple-pod configuration by fine-tuning the steering toe-in angle of each pod at different speeds, in accordance with prevailing sea and wind conditions. Te tool is based on the incorporation
of Eniram’s vessel management system into the Azipod unit. ADO complements the static optimisation undertaken at the ship design stage. By ascertaining the optimal toe-in angle
of each pod in real time throughout the vessel’s operating profile, it is claimed that the fully-automatic solution can confer fuel savings up to 2%. ADO lends itself to retrofit applications as well as to newbuilds. Determination of the optimal angle is based on a pre-calculated model taking
account of the vessel’s speed through the water. ADO outputs the optimal toe angle for use by the steering system. As the technical
foundation for the new
product, Eniram’s vessel management system was initially developed for dynamically monitoring and optimising trim, where even minor adjustments can have a substantial impact on vessel performance. ABB Marine is bringing its expertise
in Azipod technology to an European Union (EU)-sponsored, collaborative research project investigating a way of improving ship energy efficiency by combining three propulsion concepts, including podded propulsors. Known as TRIPOD, the 30-month study was launched last November to explore the
feasibility of a novel propulsion system based on the integration of podded propulsion and CLT end-plate propellers, together with the counter-rotating propeller(CRP) principle. Besides ABB, the research consortium
comprises the Spanish company Sistemar, famed for its CLT(contracted and loaded tip) propeller technology, plus VTT Technical Research Centre of Finland, shipowning group
A.P.Moller- Maersk, Spanish hydrodynamic centre CEHIPAR, and design system specialist Cintranaval-Defcar. Central to the TRIPOD study and
its EU funding is the possibility of improving the energy efficiency of commercial vessels through improved propulsion arrangements. NA
Schottel raises its game with enhanced range
Constancy in its commitment of resources to research and development, has a signal bearing on the scope and competitiveness of the propulsion solutions offered by Schottel.
T
he product portfolio has been substantially augmented and enhanced since last year with
the release of new models of proprietary SRP Rudder-propellers and STP Twin Propellers, controllable pitch propellers and transverse thrusters. Te SRP and STP series are based on the same operating principle, whereby rotation can be made through 360degs, to deliver the requisite thrust in any direction and confer precise vessel manoeuvring and position-keeping capabilities. The STP thruster is equipped with
two propellers rotating in the same direction, and incorporating the same diameter. The configuration increases the active propeller area and efficiency while reducing propeller load and associated noise generation. Te relative arrangement of the ‘pulling’ and ’pushing’ propellers is such that the vortex of the front propeller passes between the blades of the rear propeller without the cavitation swirl created by the blade tips of the
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Schottel’s 0320 series of thrusters is the uprated successor to the SRP/STP 110 models. The new range includes the first Rudder-propeller of its size to be offered with a nozzle.
former striking the blades of the latter. A compact new generation of azimuth thrusters has been added to the Rudder-
propeller offering, in the shape of the SRP 4000 type. Particular attention to structural mechanics and hydrodynamic
The Naval Architect July/August 2011
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