Sole licensed producer of the patented Hull Vane®, Hull Vane BV on Thursday (16 July) said Swiss ship owner CGN, which operates a fleet of 19 passenger ships on Lake Geneva, decided to retrofit its 30m passenger vessel Valais with a Hull Vane® and bulbous bow.
“We selected the 30m passenger ship Valais and commissioned a ship optimisation study by means of Computational Fluid Dynamics software, comparing several possible hydrodynamic improvements at our operating speed of 25 km/h,” said Irwin Gafner, technical director of CGN.
“In the study, the benchmark hull (which has a trim wedge) was compared to various retrofit alternatives for the stern, such as ducktail extensions, interceptors (a vertical blade protruding below the transom) and a Hull Vane®, which is a rather novel solution and can be described as a “spoiler for ships”.
“The best alternative to come out of this optimisation was the Hull Vane®, promising a resistance reduction of 15%. We also asked to optimise a bulbous bow for the ship with Hull Vane®.”
After the hydrodynamic study, CGN Technique ordered the Hull Vane® from Hull Vane B.V. and the bulbous bow from a local subcontractor, said Hull Vane.
Lake trials were performed before dry docking, in which accurate measurements were made of the ship’s fuel consumption.
In spite of the significant amount of added weight, including Hull Vane®, bulbous bow construction and ballast, the results showed that the fuel consumption of the vessel was reduced by 24%.
Noise measurements on board also showed that the improved efficiency, lower rpm’s and new engines made the vessel quieter: the noise level was reduced by 2 dB(A) in the wheelhouse and by 6 dB(A) in the passenger lounge.
The vessel now also makes significantly less waves, a fact which is appreciated by the recreational users of Lake Geneva.
The added weight and added submerged surfaces also improve the stability and seakeeping of the vessel.
“There are a lot of small passenger ships ranging from 20 to 100m in use worldwide, on rivers, lakes and servicing islands. Because of their length and displacement, they often operate at excellent speeds for Hull Vane® effectiveness, making a retrofit very worthwhile,” said Bruno Bouckaert, sales director of Hull Vane BV
“We are very happy that CGN took this pioneering step. Having a Hull Vane® on a passenger ship also makes it a lot easier for us to show clients how simple and effective the device really is.
“MS Valais is the ideal demo boat, as we can simply buy a ticket and make a crossing on board.”
“We have calculated that this retrofit on MS Valais will reduce CO2 emissions by 129 tons per year, and of course also 24% of diesel particles and NOx emissions,” added Irwin Gafner CGN.
“Last but not least, the return on investment is excellent.”
Photo credit: Hull Vane BV
Published: 17 July, 2020
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