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Functionally the propulsion drive can be divided into following parts : supply transformer, propulsion motor and frequency converter. In an AC drive, a frequency converter is used to control the speed and torque of electric motor. The speed of the AC electric motor can be controlled by varying the voltage and frequency of its supply. A frequency converter works by changing the constant frequency main electrical supply into a variable frequency output.
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SCHOTTEL has developed a new concept that combines the main technical and economic criteria of both mechanical Rudderpropellers and pod drives: the SCHOTTEL Combi Drive (SCD).
In contrast to pod drives with an electric motor inside the underwater pod, the motor in the new propulsion system will be integrated vertically into the support tube of the Rudderpropeller. This arrangement of the electric motor means that the concept is similar to that of a Rudderpropeller with a vertical power input (“L system”). Moreover, neither an above-water gearbox nor a cardan shaft will be required, making the system extremely compact and easy for the shipyard to install in the vessel.
The SCHOTTEL Combi Drive will be based on the successful Rudderpropeller types SRP 1515, SRP 2020 and SRP 3030, with their proven mechanical components, and will cover the power range from 1900 to 3800 kW with propeller diameters from 2500 to 3500 mm. The azimuth steering can be implemented using either hydraulic or electric motors. The new drive will be available as single propeller version with nozzle or twin propeller version.
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Twin Azipod® provides greater maneuverability and full redundancy from power generation to propeller. Twin Azipod® is the most widely used propulsion for cruise ships.
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Steadily increasing market demands for larger and faster ships have
led to the development of CRP Azipod®, an innovative contra-rotating
propulsion system that enhances efficiency up to 15% compared to
other propulsion technologies.
Contra-rotating propulsion means that there are two propellers on
the same line rotating in opposite directions. With CRP Azipod®, a
steerable Azipod® unit is installed in place of a normal rudder, aligned
downstream of the main propeller. The Azipod® propeller takes
advantage of the rotative energy left in the slipstream of the forward
propeller, providing significant efficiency gains. CRP Azipod® combines
with most types of main propulsion.
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The APU is a perfect fit with WESMAR's other hydraulically driven products, and partners well with WEMAR's Central Hydraulic Systems. It offers complete control from the helm and can be operated right from the bridge by simply turning the key and using the proportional joystick for forward and aft propulsion. Once the system is engaged with the key lock at the helm, it is activated and you are immediately in control and underway. No need to visit an engine room at all.
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SCHOTTEL Steering and Control Systems (SST) are tailored to each individual application. The spectrum extends from simple manually operated mechanical steering wheels on the propulsion unit itself to computer-aided, remote-controlled joystick systems.
It is no longer possible to imagine this sector without microelectronics, which considerably enhances the operational reliability. With our systems, we are in a position to give every shipmaster the optimum “tool” for operating, manoeuvring and positioning his vessel safely and easily.
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The workmanship of the gear boxes is of the same high quality as the rest of the programme of Hundested propeller fabric.
The CPG gearboxes introduce new principles for marine gears, as it is possible to fit PTOs as a modular system. The CPG gearboxes can be applied to both Hundested Multi Pitch Propellers and other types of variable propellers.
The hydraulic system includes a double oil pump. One pump is utilized exclusively for the pitch control and the other one is utilized for the clutch, the shaft brake, and lubrication.
A great advantage of choosing Hundested Marine Gears is that beside our standard product line we offer individually developed solutions to meet all requirements to dimensions, power, reduction ratio, angle gears etc.
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Fully reversible compact electrical pitch control unit with built-in thrust bearing. The pitch can be adjusted only at low shaft RPM and low propellerload. The pitch is controlled from the wheelhouse via a potentiometer.
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HUNDESTED retractable thrusters are available in 4 models ranging from 25 HP to 150 HP. In the ejected mode, the retractable thruster works like a conventional thruster. In the retracted mode a plate covers the opening in the hull, ensuring a minimum of added resistance.
The housing of the retractable thruster is manufactured in aluminium It comes with a 3- or 4-bladed propeller also manufactured in aluminium.
The retraction mechanism is electrically or hydraulically activated.
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HUNDESTED thrusters are available in 4 models ranging from 25 HP to 1350 HP.
It is most difficult to establish rigid rules concerning thrust capacity for a special vessel. The necessary thrust and type of thruster depends on vessel size, intended use and required maneuverability.
HUNDESTED thrusters can be hydraulic, electronic or diesel powered (Diesel driven models only available for 120 HP and upwards). The recommended drive system depends again on the vessel and its installed systems.
All HUNDESTED thrusters are available with a complete drive system.
Please contact our technical department for further assistance, when selecting your optimum thruster solution.
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The propeller hub
The propeller hub is made of nickel- aluminum-bronze and is attached to either a flanged shaft or tapered end shaft, depending upon the system size. The propeller blades are moved by a tie rod cross head with stainless pins.
On each pin a movable slipper block is mounted in a milled slot in the blade foot.
The propeller head is lubricated with water emulsifying grease.
The mechanism of the propeller head consists of simple mechanical parts.
The propeller blades
The blades are made of nickel-aluminium-bronze in 2, 3, or 4 bladed design. They are designed for open running and propeller nozzles, as well as for feathering position.
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