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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