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Monday, October 14, 2019 

Schottel has announced the 1,000th delivery of its rudderpropeller type SRP 460, which the company claims to be the most successful azimuth thruster worldwide.

With a maximum power rating of up to 2,350 kW per engine, rudderpropellers such as the SRP 460 are among Schottel’s bestsellers. The SRP 460 has undergone several technical updates through the years. Following its launch in the late 1990s, the first SRP 460 (formerly SRP 1515) was delivered to the Danish tug operator Svitzer in 1999. The company’s harbour tug Mussandam was equipped with two SRP 460 Rudderpropellers – each with an input power of 1,850 kW. The tug is currently being operated by the Spanish shipping company Boluda under the name VB Muleton. The two original SRP 460 thrusters have now been in operation for more than 20 years and still provide the vessel with maximum manoeuvrability and bollard pull.

Several technical updates have increased input speeds and propeller diameter. The latest update led to the development of the SRP 490 Rudderpropeller, an enlarged version of the SRP 460, with a propeller diameter of up to 2.80m and a rating of up to 2,550 kW per engine.

The SRP 460 is available in numerous other forms, which include the Schottel Combi Drive (SCD), in which the electric motor is integrated vertically into the rudderpropeller, as well as the Schottel Twin Propeller (STP) for vessels which require high efficiency at limited draft and large propeller clearance. Beyond this, there is a retractable rudderpropeller (SRP R) variant, which offers greater flexibility in terms of design and operational profiles, and a Rudder EcoPeller (SRE), which is characterised by top performance in terms of overall efficiency and course-keeping stability.

In addition, the recently introduced Schottel Sydrive hybrid azimuth propulsion systems (Sydrive-E and Sydrive-M) offer flexibility in any hybrid vessel design. With these systems, new upper gears for all input rpm enable optional hybrid propulsion as well as flexible installation variants for all hull forms. New fully integrated slipping clutches are also available.

The SRP 460 is equipped with technologies such as ProAnode, Leacon and HTG technology, which means it can transmit 15% more power than conventional bevel gears. ProAnode protects the anodes against external impact and reduces the drag resistance of the nozzle by moving the position of the anode from the outside surface into the cross-section of the nozzle tail. This leads to subsequent operational benefits, such as reduced flow interference, and thus fuel savings. Schottel Leacon is a type-approved leak-free sealing system and meets current VGP requirements without the need to use EALs.

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