Transverse Thrusters
50 kW to 1650 kW
All major classifications
Unrivalled durable gears
4000 thrusters in operation
High-performance FP propellers
Jastram have been developing and producing transverse thrusters since 1950. Reliable gears, worldwide service, direct contact to our service department and detailed archived data for each delivered system are well accepted by the maritime industry and international shipping companies.
Jastram are specialised in fixed pitch propeller (FPP) thrusters which require minimal servicing due to their solidity and durability. To improve performance the propeller design is continuously modified according to the latest developments.
With electric drive systems ranging from the low-cost 3-step control for onshore manoeuvring to the frequency-controlled drive for offshore dynamic positioning Jastram offer transverse thrusters for a wide variety of vessel types.
table
The following table of Jastram thruster types indicates the maximum speed and power based on a 50Hz / 60Hz power supply and the German Lloyd type approval. 'Max kW' may differ for special applications and requirements of other classification societies.
The given thrust range in kN results from the calculation using the column 'Max kW' and is based on optimised tunnel, inlet cone and fore shapes. The range is influenced by the respective installation design.
| Type | Prop ø mm | Max Input Rpm | Max kW | Max kW Diesel DP* | Thrust approx kN |
| BU10 | 620 | 1.500 1.800 | 70 83 | 10-12 11-13 | |
| BU20 | 840 | 1.500 1.800 | 138 165 | 116 140 | 18-21 20-24 |
| BU40 | 990 | 1.500 1.800 | 217 260 | 187 225 | 27-32 31-36 |
| BU50 | 1.000 | 1.500 | 315 | 315 | 35-41 |
| BU60 | 1.220 | 1.500 1.800 | 510 610 | 426 510 | 55-65 62-73 |
| BU90 | 1.600 | 1.500 1.800 | 583 700 | 500* 600* | 72-85 81-96 |
| BU100 | 1.940 | 1.000 1.200 | 750 900 | 688* 825* | 97 - 114 109-128 |
| BU120 | 2.270 | 1.000 1.200 | 835 1.000 | 725* 870* | 115-135 130-153 |
| BU140 | 2.570 | 1.000 1.200 | 1.370 1.650 | 1.165* 1.400* | 174-205 197-232 |
installation
Jastram transverse thrusters are made from high-grade certified materials and are designed individually according to the given installation conditions.
Classification certificates for any classification society can be delivered for the whole thruster system.
Vertical or horizontal mounting or any other installations for electric, hydraulic or diesel engine drives are available.
Drive shaft extensions for restricted space in stern installations and detachable systems for workboats to allow servicing without docking are examples of our ability to meet customer requirements.
technical features
The propeller is mounted with a tight oil press fit which allows rapid mounting and dismounting during shaft seal changes.
The stainless steel ring in the propeller tip region protects the tunnel against cavitation damage.
The oil lubrication system with oil level sensor (to be installed by the shipyard above waterline) protects the seals against water ingress.
Galvanic cathodic protection (CP) is calculated and installed to protect the system for up to 5 years.
options
Impressed current cathodic protection (ICCP) instead of anodes for longer life and reduced resistance in the tunnel.
Anti-suction tunnel (AST) – a second smaller tunnel installed behind the bow thruster to increase the thrust during cruising.
A holding brake to prevent propeller windmilling and noise during passage is recommended. Besides electric motor brakes, hydraulic, pneumatic and electrically driven disk brakes are available for new builds and retrofits.