New class-approved rudder propellers by Jastram

By Peter Pospiech at September 18, 2012 05:46
Filed Under: Company News, drive systems

Jastram, a tradition rich Hamburg based marine engineering and equipment manufacturing company is introducing its newly developed rudder propeller in the power range of 100 to 380 kW.
The new design of the Jastram RP320 and RP380 rudder propeller is based on 40 years of design and engineering experience. Their quality, dependability and robustness have been enhanced by the improvement of several technical details. The hydrodynamic shape was developed with the aid of CFD analysis (computational fluid dynamics). Service engineers collaborated on the design process, ensuring cost-effective mounting and maintenance.
In cooperation with the classification societies, these systems, in varying configurations, have been approved for use in both inland waterway and marine vessels.
The initial speed of 1,800 rpm and 2,100 rpm mean that the rudder propeller can be used with all standard diesel engines. The optimum propeller diameters are 900mm for the RP320 and 1,100mm for the RP380. Customized propeller diameters are available as well.

The RP320 rudder propeller with optional fin

For propellers without a nozzle, an optional fin can be bolted on for protection against grounding. The cover plate prevents the propeller from ventilation at varying immersion depths.
The worm gear drive of the slewing gear has very compact dimensions, particularly in the hydraulic configuration, and is ideal for use on outer decks. Spur gears with two drive motors are used for marine vessels or for well mounting. These systems comply fully with all requirements of the classification societies. The company offers a range of different configurations for the propeller, the slewing gear and the installation of the drive, which can be combined as needed.
The company names the advantages of the new rudder proller as follows:
Increased thrust - Less noise and vibration - Protects the propeller and objects in the water - The nozzle is attached to the gear casing for easier servicing

The RP320 rudder propeller with nozzle

Images: courtesy of Jastram


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