Steplessly vary the propeller
rotation at constant
engine speed.
Variation of propeller rotation
at engine idling speed
Variation of propeller rotation at nominal
speed, full firefighting pump output and
simultaneous low propeller rotation for
holding position via drive system
| Version | MD | HD | |
|---|---|---|---|
| Size | 66 | 72 | 75 |
| Power * | 2.900 kw | 4.150 kw | 2.750 kw |
| Speed * | 1.800 min-1 | 1.600 min-1 | 750 min-1 |
| P/n | 1.65 | 2.62 | 3.7 |
| Torque | 15.750 Nm | 25.000 Nm | 35.650 Nm |
| Heat dissipation | 45 kW | 90 kW | 450 kW |
All features in one clutch-system.
ACTIVE BRAKE
CUSTOMER – PTO
PROP.ACT
CONTROL
ELECTRIC
AUXILIARY PUMP
SENSORS
As shaft brake and for extremely precise variation of propeller rotation
As an option, the Prop.act is offered with a brake that provides two functions:
1. As classic shaft brake for holding the propeller and thereby securing the propeller position to prevent unintended rotation. The braking torque is set at 50 % of the engines’ nominal torque. Idling torque from the clutch is suppressed.
2. For variation of propeller rotational speed: The trolling range is enhanced. By applying a low braking torque, the propeller speed is regulated from zero up to the desired speed.
Additional power supply
The Prop.act is equipped with a power take-off (PTO). The customer can use the PTO, for example, to drive the pump for propeller adjustment.
Simple integration into vessel control system
We offer the Prop.act as a package complete with a control system. In other words: Our customers do not have to bother with programming or actuation of the components and can completely rely on Ortlinghaus to do this. Integration of our controls in the vessel control system is straightforward, and described on provided integration sheet.
Secure towing even in strong waves
Ortlinghaus offers an electric pump that can be run independently of the diesel engine. As desired for towing manoeuvres, for example, the shaft brake can also be used with this pump while the diesel engine is switched off. Clutch operation can be maintained even if the engine speed is lowered below a critical point.
Permanent condition monitoring prevents overload
The availability of our units is secured through permanent condition monitoring of all of the relevant components. Monitoring of the units is achieved by recording the speeds, pressures and temperatures. If the permissible parameters are exceeded, our control system prevents an overload.
Full propeller control.
Extreme continuous slipping
Simple integration
Safety
Long service life
Sturdy construction
Trolling to speeds close to zero
Costs
Compact design
The possibility of continuous slipping makes safe manoeuvring possible even under rough sea conditions and challenging escort manoeuvres.
Straightforward integration of the Prop.act in the drive train is facilitated by free positioning in the drive train between the rudder propeller and engine, together with the control system supplied as an option and the dedicated cooling system.
The slipping function offers a high level of safety against stalling of the diesel engine. The captain therefore always has a secure drive system at his disposal, allowing fast reactions to loss of drive or control of escorted ships.
If deployed correctly, the unit achieves a main service interval of at least 40,000 operating hours.
The sturdy construction of the unit offers a high level of operational reliability.
The slipping function of the clutch in combination with the additional brake makes it possible to vary the propeller speed to almost zero.
The combination of Prop.act and rudder propeller drive with fixed pitch propeller (FPP) is a cost-effective alternative to controllable pitch propeller (CPP) drives.
This type of installation saves space compared with separate firefighting drives.
“Excellent clutch for harbour tugs with a proven design based on decades of experience and knowledge.”
COHEN BOUDESTEIJN
Former product director tugs and workboats at DAMEN shipyards
“Ortlinghaus is providing outstanding engineering support as our reliable partner for more than 15 years.”
STEFAN KAUL
Chief executive officer (CEO) & president ‘Industrial Operations’ at SCHOTTEL GmbH
Fast reaction times, global presence and extensive know how of our Service Team make the difference.
Original spare partsProduct overhaul at OrtlinghausService & repair worldwideCondition check
May 5-8, 2025 OTC Offshore Technology Conferene | USA, Houston
Our representation in USA, Orttech, looks forward to seeing you.
The Offshore Technology Conference (OTC) is a premier global event where energy professionals gather to exchange knowledge, discuss innovations, and advance offshore resource and environmental technologies. Held annually in Houston since 1969, OTC is supported by leading industry organizations and has expanded internationally with OTC Brasil and OTC Asia.
June 3-6, 2025 Nor-Shipping | Norway, Oslo
Nor-Shipping 2025 is a leading global event for the maritime industry, bringing together innovators, decision-makers, and experts to showcase cutting-edge solutions, foster collaboration, and drive sustainable development for the future of ocean industries.
July 16-19, 2025 MetalForm | Tokyo
Our representation in Japan, Tomita Co., Ltd., looks forward to seeing you.
As the manufacturing industry evolves, MF-Tokyo 2025 will showcase technologies that drive productivity and sustainability. The exhibition focuses on carbon-neutral solutions across the entire lifecycle—from production to recycling.
September 8-11, 2025 Fabtech | USA, Chicago
Our representation in USA, Orttech, looks forward to seeing you.
We are excited to announce FABTECH 2025, North America’s largest event for metal forming, fabricating, welding, and finishing.
December 02-05, 2025, marintec | China, Shanghai
Our representation in China, Ortlinghaus International Trading (Shanghai) Co., Ltd., looks forward to seeing you.
Marintec China is poised to be the definitive event and is undoubtedly a must-attend marine exhibition for all involved in the maritime industry.
December 3-5, 2025, International Workboat Show | USA, New Orleans
Our representation in USA, Orttech, looks forward to seeing you.
North America’s largest commercial marine tradeshow in New Orleans, La. The WorkBoat Show is the only solution that can connect you to the best resources in the maritime industry all in one convenient location.
