SCHOTTEL has launched a new retractable variant of its rim thruster (SRT). (Image courtesy of SCHOTTEL)
German propulsion specialist Schottel has launched a retractable variant of its rim thruster (SRT). The solution is available in a retractable (SRT-R) variant, in which no additional flow resistance is generated when withdrawn, as well as an RT variant, in which the unit can be used as a transverse thruster while withdrawn.
Covering the power range up to 500 kW, the new SRT-R offers low noise emissions and tailor-made solutions for a wide range of applications. Optimized by computational fluid dynamics (CFD), the internal propeller blades are designed to be resistant to cavitation.
The SRT-R can cover a thrust radius of 360 degrees. This offers additional versatility, and also allows the thruster to be optimally adapted to any requirement and operation profile, including dynamic positioning (DP) operation or as a take-home device.
Schottel is also offering the retractable rim thruster as an RT variant. This means that it also functions as a transverse thruster while retracted, making it highly effective in shallow water. Characterized by improved manoeuvrability, its range of application extends from brief docking and casting-off in ports to continuous operation with dynamic positioning. The company notes that the It also stands out due to its short response time to steering commands, with make precise dynamic positioning easier at all times.
The SRT is an electric propulsion system. The electric motor stator is installed in the outer part of the tunnel, while the propeller blades are attached to the inside of the rotor. This results in a space-saving and low-weight thruster. It converts electric power directly into propulsion power. Surrounding water permanently cools the electric motor, preventing it from overheating.
The first SRT units as well as the retractable variant are already proving their reliable operation on different types and sizes of vessels.