After 55 years and over 7300 projects the multiple award winning yacht design, engineering and naval architect studio, Vripack today more than ever shifts rusted paradigms. And how! They proudly announce that they have received a patent for one of their hull designs for the first time. A hull with such unique performance characteristics that she is worthy of a patent protection.

Vripack - SC Amethyst

The realization of the invention is as unique as its outstanding performance. It is the result of a close and long term cooperation with returning customer and experienced captain Jaap de Bruijn. Driven by his passion for performance and comfort he tirelessly worked on the optimisation of the hull of his ship. Literally cutting the shell and re-shaping her, over and over again for nearly a decade. By pure trial and error he made off-book discoveries and shared them with Vripack’s naval architects. Peter Bouma, Naval Architect at Vripack remembers well: “What he told us couldn’t work and we didn’t actually believe him at all at first. No formulas, algorithms or white papers supported anything he claimed.”

Captain Jaap is as strong minded as a Dutch captain can be and his off-book discoveries and close cooperation with Vripack eventually formed the basis for their radical Slide Hull®. “I could see the twinkle in their eyes when I persuaded them with my simple philosophy that books and formulas only tell you what you know and that I was telling them something we all didn’t know. I just knew that when I was in a gale force with my ship taking out seasoned pilots, everyone was amazed by the soft ride of my boat regardless of the fact that we were doing 25 knots in 2,5 meter significant wave heights. They all wanted to go out to sea with my boat.”

After hundreds of hours of research, sea trials and empirical comfort studies Vripack manages to capture the essence of the Slide Hull® and improve it even further with some 15% efficiency at fast displacement speeds. “Together with captain Jaap and his friend Ruud Lievaart we went on and designed the SC Amethyst. She is the first vessel equipped with our Slide Hull®.”  

"It is like the boat is 
riding on cushions"

Peter Bouma - Naval Architect
Vripack - Peter Bouwma - Naval Architect

“The comfort of this hull is described by her sailors like the boat is riding on cushions. The damping in waves is beyond unique and thus prevents sea sickness. Next to that the fuel consumption of our Slide Hull® outperforms any other vessel that I have ever seen,” Peter Bouma continues. “The SC Amethyst uses just 180 litres at a cruising speed of 21 knots which is really low for a 45-ton-ship. The lines are placed such, that when the vessel picks up speed the water flows in a way that resembles how you go down a slide, hence the name. Thanks to the Slide Hull® we outperform all other competitors in this field”, Peter Bouma smiles proudly.

Vripack reports that their new hull is specifically designed for fast displacement hull speeds particularly for vessels with a large variation in loads. Currently two more vessels are under construction with Slide Hulls®.