How it works

  • Hull Vane®
  • Foil Assist

How it works – Hull Vane®

Forward Thrust

The flow of water under a vessel’s stern isn’t always horizontal but angled upwards.

Our Hull Vane® has a profile shaped like a horizontal wing, which generates lift perpendicular to this flow. The horizontal component of this lift provides forward thrust that is transmitted through the Hull Vane’s struts.

We designed and engineered the wing’s hydrodynamic profile so that the thrust it generates is greater than the drag it creates. In other words, the net result is reduced resistance for your vessel as a whole.

Wave Reduction

The Hull Vane’s wing-shaped profile creates an accelerated flow of water over its upper surface, producing a low-pressure region behind your vessel. This interacts with your vessel’s wake to suppress its stern wave in much the same ways as a bulbous bow suppresses a vessel’s bow wave.

There’s a direct correlation between a vessel’s wake, or wave pattern, and the power required for propulsion. Suppressing the stern wave therefore reduces fuel consumption.

What’s more, a suppressed wake pattern reduces noise levels and creates less disturbance for others and – as a naval vessel – lower visibility!

Trim Correction

The Hull Vane® also reduces the running trim, keeping the vessel at even keel throughout its entire speed range.

Incorporating a Hull Vane® in the early design stages allows naval architects to design their vessels for minimal trim variations.

In shallow water, the vertical component of lift that the Hull Vane® produces significantly reduces a vessel’s squatting effect, allowing for higher top speeds.

Reduced Pitching

When sailing in waves, the Hull Vane® damps pitching motions.

This reduces wave resistance and, in turn, improves on-board comfort and safety, for example helicopter operations and/or launching/recovering daughter craft.

And interestingly, when a vessel is pitching, a Hull Vane® generates even more forward thrust – an effect we call the ‘pumping effect’.


Naval & Patrol Vessels

  • Increased operability
  • Reduced emissions
  • Improved seakeeping


  • Increased comfort
  • Higher speed
  • Reduced noise

Commercial Ships

  • Maximum operability
  • Reduced fuel costs
  • Future-ready design

How it works – Foil Assist

Lift generation

The idea behind the Foil Assist it that the foil carries up to 60% of the weight of the vessel on the foil. For this the vessel has to plane, sailing at speeds above 20 knots. Since a hydrofoil is a more efficient in producing lift in comparison to the hull the overall efficiency goes up.

Motion dampening

Due to the lifting effect of the Foil Assist motions of the vessel are dampened. Especially with the vessel sailing at high speeds, wave impacts are always present. With the Foil Assist attached, the behaviour of the vessel gets much smoother. This results into smooth sailing at high speeds, in ultimate comfort.

Improved Sailing behavior

With the hull and Foil Assist sharing the weight of the hull, the vessel still behaves like a planing vessel. This is very important for the user since they are familiar with sailing behaviour of planning vessels, not with hydrofoil vessels.

Benefits for fast planing vessels up to 25 metres

  • Increased sailing comfort and safety
  • Less pitching and slamming
  • Improved sailing behaviour
  • Less spray for a drier ride
  • Higher speed in waves