New rudderpropellers and twin propellers for smaller vessels
Schottel 0320 series thruster
Schottel of Germany has introduced a number of new versions to its portfolio of propulsion products.
The new SRP 0320 rudderpropeller is an uprated successor to the SRP/STP 110 with modular design, technical innovations and additional functions. It features a diameter of 0.65m - 0.85m and a weight of 1.50t, and provides a power of 150 - 220 kW at 1800/2300 rpm.
The company says that the SRP 0320 represents the first rudderpropeller of this size to be available with a nozzle, developed specifically for shallow waters. The nozzle provides more thrust for propulsion and manoeuvring.
Installation has been facilitated by means of an integrated hydraulic system which eliminates the need for any further installation work onboard the vessel. Maintenance has been simplified with an easily exchangeable underwater gearbox and a freely accessible coupling.
The new system is intended primarily for use on work vessels, barges, push boats, passenger ships and double-ended ferries.
The SRP 4000 is the first Schottel rudderpropeller in a new future generation of azimuth thrusters being introduced at the SMM exhibition. Through intensive research and development in the areas of structural mechanics and hydrodynamic design, Schottel has achieved a weight reduction of some 20% in relation to the equivalent model from the current series. Besides a noise-optimised gearbox, designed for a large range of input speeds, and compact construction, which allows about 35% reduction of the oil charge, the new SRP generation features integrated steering hydraulics. For high-speed applications, a tailored propeller nozzle is available. The weight reduction and the decreased oil charge result in cost benefits for the customer.
The SRP 4000 T variant has been developed for tug applications to cover the power range of terminal tugs with a bollard pull of 80 tonnes or more.
The SRP 4000 is available as a Schottel Twin Propeller (STP) for vessels with relatively high speeds such as offshore supply vessels or ferries; it can be operated with a high efficiency and free of cavitation up to 18 knots.
For applications requiring a lightweight construction and high power capabilities, Schottel has extended its CP propeller product range to include a five-blade variant. This offers a high power density and a weight reduction of up to 15% while retaining reliability and robustness. Schottel SCP propeller systems of the 5-X series are available in sizes from SCP 046 5-XG to SCP 154 5-XG for power ratings from 1000 to 30,000 kW.
For all sizes there is an optional version with feathering capability. This makes it possible to satisfy the requirements of different operational states in the case of multi-shaft systems and combined propulsion concepts.
A further introduction is a re-engineered series of transverse thrusters, designated STT 1-5 in the power range from 600 kW to 1500 kW. They are available with either FP or CP propellers to hydrodynamically optimised designs with improved efficiency and low noise, and with low losses at zero or low propeller pitch.
The tough DP requirements in offshore applications have been taken into particular account. The thrusters are particularly suited to DP offshore applications, with blade tip speed and propeller load reduced to a minimum, improving the service life of drive seals and bearings, and of propeller hub and blades.
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