nent-magnet( PM) motor, enables space savings, eases the installation and maintenance and maximizes comfort onboard. The high efficiency of the PM-motor combined with that of contra-rotating propellers( CRP) will bring the fuel economy to a whole new level,” promises Jukola.
IMPROVED MANOEUVRABILITY
Rolls-Royce has developed Promas, an integrated propulsion and manoeuvring system.
” By adapting the propeller and rudder into one propulsive unit, Promas offers increased propulsive efficiency and improved manoeuvrability”, says Göran Grunditz, Manager of the Rolls-Royce Hydrodynamic Research Centre( HRC).
In general the efficiency gain is between 3 to 8 percent for single screw vessels and 2 to 6 percent for twin screw vessels.
” Virtually any vessel will benefit. The position of the rudder in the slipstream and the skeg design can deliver further improvements,” Grunditz points out.
The Rolls-Royce Promas system comes in a number of forms.
For newbuilds, there is the full Promas. One version of it includes a high efficiency propeller in a nozzle, with a hubcap and specially designed rudder.
Promas Lite is specifically designed for retrofitting to vessels with conventional shaftlines. The main difference in comparison to full Promas is that the existing rudder is normally retained, saving costs with only a small sacrifice in propulsive efficiency. n photo: STEERPROP LTD.
Steerprop Ltd. has launched a new generation of ducted azimuth propulsors with new features and upgraded design specifications. seatec 1 / 2017 43