Tunnel thrusters

In 1985 we introduced our line of tunnel thrusters and since then we have delivered more than 500 units. Our tunnel thrusters are designed for heavy use in all types of commercial vessels. We can supply 4 different models ranging from 20 HP and up to 2700 HP. Depending on size, the propeller is either fixed, adjustable or CP type. They can be hydraulic, electric or diesel powered. We are very flexible regarding special requests such as tunnel diameters and lengths that are not in our standard product range.
• From 20 HP to 2700 HP
• Hydraulic, electric or diesel powered


In 1989 we were approached by one of our loyal customers in the sailing yacht industry. They wanted us to design and produce a thruster for one of their sailing yachts. The idea was that it had to be swing retractable. That type of thruster didn’t exist at the time. We thought that was an exciting challenging task so we developed the first swing retractable thruster in the world. Our retractable thrusters are available in 4 model sizes ranging from 25 HP to 200 HP. In the ejected mode the retractable thruster works like a conventional thruster. In the retracted mode a plate welded to the thruster tunnel covers the opening in the hull ensuring a minimum of added resistance. This feature is especially popular in the sailing yacht industry. As standard the housing is manufactured in aluminium and it comes with a 3- or 4-bladed propeller in either Aluminium or Nickel Aluminium Bronze. The prime mover is hydraulic and the retraction mechanism is either electrically or hydraulically activated.

Thruster References

“Y3” – Sailing Yacht
Main info:
Shipyard: Holland Jachtbouw
Lenght o.a.: 45 m
Main engine: Volvo Penta D16, 750 HP @ 1900 RPMHundested supply:
Propeller unit: VP9, Ø1400 mm.
Gearbox: CPG32, 3,96: 1, 1 PTO
Thruster: 2 x FT3R, 100 HP, retractable


If something should happen to your product, we recommend to contact one of our service centers in our worldwide BSI Group network here.