‘Hull Vane’ lifts spirits at Van Oossanen
WAGENINGEN _ It debuted on a 30m passenger catamaran. Next it appeared on a 55m offshore supplier. Now, Heessen Yachts has put it on the 42m motor yacht Alive. Three very different vessels enjoying the same benefit of a fixed transom hydrofoil. Developed by Van Oossanen Naval Architects, the “Hull Vane” generates significant fuel savings.
In the case of the 55m offshore supply vessel, these were in the order of 10% at 12 knots. And 15% at 21 knots. The Alive speed trials were in line with fluid dynamics software predictions and and model tests. They showed the “hull vane” cutting resistance by 20% at cruising speed. On March 18, the foil was named a runner-up winner at the “Day of the Engineer,” an annual event showcasing engineering ingenuity across different economic sectors. The jury praised the Hull Vane for rendering substantial fuel savings. The company developed the Hull Vane over a period of 12 years.
The brainchild of Pieter van Oossanen, it is protected by patents in all major shipbuilding countries. Van Oossanen: “The Hull Vane is most effective for ships with a moderate speed, ships like ferries, supply and container vessels and the somewhat faster merchant ships.”
A fixed foil below the stern, the Hull Vane modifies the stern wave pattern and creates hydrodynamic lift that is partially oriented forward. This results in less hull drag. The performance of the Hull Vane depends on a vessel’s length, speed and hull shape in the aft sections
It also reduces the stern wave and the running trim because it dampens pitching, rolling and yawing motions. On Alive, the vane was incorporated into the yacht’s design saving money and space. It meant smaller engines could be installed that would still guarantee a transatlantic range. The Hull Vane is suitable for relatively fast vessels at displacement or semi-displacement speeds. Besides superyachts, these include ferries, naval and coast guard ships, offshore suppliers, midsized container vessels and small cruise ships.