Tunnel Thruster
The tunnel system is primarily used as a bow or stern thruster. Depending on the ship's design, the tunnel system is installed either in the bow or the stern. The tunnel system has a high efficiency of approximately 13.5 kg/kW.
OFP tunnel systems are used on all types of ships with sufficient draft to ensure the proper thrust. The distance from the waterline, under the lightest sea-going conditions, to the center of the tunnel should be approximately one and a half times the diameter of the tunnel.
Tunnel systems with a fixed pitch propeller are characterized by variable and reversible shaft speeds. OFP tunnel systems can be powered electrically, hydraulically, or by a diesel engine. The thrust direction is controlled by reversing the direction of the drive motor, or – in the case of a diesel engine – via a reverse mechanism.

Features
- Well-engineered design
- High efficiency
- Easy to install
- Maximum efficiency
- Strong and solid construction
- Low noise levels
Applications
- Seagoing vessels
Specifications for Tunnel System with Fixed Propeller
Type OFP |
Schroef Diameter [mm] |
Ingaand Toerental [Tpm] |
Uitgaand Toerental [Tpm] |
Tandwiel Verhouding [i] |
Tip Snelheid [m/s] |
Max Power [Pk] |
Max Power [Pk] |
320 | 320 | 1500 /1800 |
1500 /1800 |
1.00/1.00 | 26,7 /32,0 |
25 | 34 |
370 | 370 | 1500 /1800 |
1500 /1800 |
1.00/1.00 | 30,2 /36,3 |
35 | 48 |
440 | 440 | 1500 /1800 |
1500 /1200 |
1.00/1.50 | 35,3 /27,6 |
45 | 61 |
530 | 530 | 1500 /1800 |
1000 /1200 |
1.50/1.50 | 27,8 /33,3 |
60 | 82 |
580 | 580 | 1500 /1800 |
1000 /955 |
1.50/1.85 | 30,0 /29,6 |
90 | 122 |
660 | 660 | 1500 | 955 | 1.57 | 33,0 | 120 | 163 |
715 | 715 | 1800 | 900 | 2.00 | 33,7 | 150 | 204 |
750 | 750 | 1500 | 750 | 2.00 | 29,5 | 200 | 272 |
805 | 805 | 1800 | 753 | 2.39 | 31,7 | 225 | 306 |
950 | 950 | 1500 | 612 | 2.45 | 30,5 | 250 | 340 |
1000 | 1000 | 1800 | 623 | 2.89 | 32,6 | 275 | 374 |
1100 | 1100 | 1200 | 508 | 2.36 | 29,3 | 300 | 408 |
1160 | 1160 | 1500 | 519 | 2.89 | 31,5 | 350 | 476 |
1200 | 1200 | 1800 | 514 | 3.50 | 32,3 | 400 | 544 |
1250 | 1250 | 1500 | 422 | 3.56 | 27,6 | 448 | 609 |
1250 | 1250 | 1800 | 514 | 3.50 | 33,7 | 538 | 732 |
1550 | 1550 | 1500 | 365 | 4.11 | 29,6 | 770 | 1047 |
1550 | 1550 | 1800 | 369 | 898 | 29,9 | 760 | 1034 |
1800 | 1800 | 1200 | 343 | 3.50 | 32,3 | 846 | 1150 |
1800 | 1800 | 1500 | 323 | 4.64 | 30,4 | 890 | 1210 |
1800 | 1800 | 1800 | 323 | 5.57 | 30,6 | 1060 | 1442 |
* Maximum power may vary, depending on the application and classification.
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