The accelerated flow of water over the Hull Vane’s top surface creates a low pressure region that interacts with the vessel’s wake, suppressing its stern wave in much the same way as a bulbous bow suppresses a vessel’s bow wave. A vessel’s wake or wave pattern correlates with the energy used for propulsion purposes. Suppressing the stern wave therefore reduces fuel consumption. Added benefits are that the noise of the wake is reduced, there is less disturbance to other ships and (naval) ships become less visible.
When sailing in waves the Hull Vane® dampens the pitching motions. This reduces the added resistance from waves and improves the comfort onboard and the safety of operations such as helicopter landings or the launch and recovery of daughter crafts. Moreover, when the ship is pitching, the Hull Vane® generates more forward thrust. We call it the pumping effect.
The Hull Vane® is particularly effective when used on medium speed displacement vessels, or expressed in naval architecture terms at Froude numbers between 0.2 and 0.8.
Suitable candidates for a Hull Vane® include coastguard and naval vessels, passenger ships, ro ro ships, expedition cruise ships, fast supply vessels and motor yachts. For these types of vessels, energy savings of between 5% and 20% are typical and in some cases even 25% savings are attainable.