Science of the Rafnar Hull
The Rafnar Hull significantly increases on-board safety for crew and passengers. Independent research conducted by the University of Iceland compared the Rafnar Hull to other hull forms in vessels of equal size and weight. The study demonstrated that Whole Body Vibration (WBV), which can negatively impact the crew’s health, are significantly reduced in Rafnar’s boats. The research involved studying the hulls‘ behavior in various conditions, including different directional angles when hitting waves, different wave heights, cruising speeds and wind conditions. The study focused on WBV standards defined in ISO 2631-1:1997. Simply put, a health guidance caution zone is defined as being above 0.57 g, where impacts above this value are considered to be hazardous. When measuring instances of hazardous conditions at the bow of each craft, the Rafnar Hull only showed only six instances compared to 112 in the comparison craft. Likewise, instances measured in the cockpit of the Rafnar Hull were only six compared to 33 instances of the comparison craft.
While the study is still underway, with more comparison vessels being studied to improve accuracy, the results so far clearly indicate that the Rafnar Hull demonstrates substantially superior stability and comfort to comparison crafts. The results show that the Rafnar Hull is capable of significantly reducing the risk of prolonged exposure to whole body vibrations, greatly improving on-board safety for crew and passengers and extending the life time of expensive equipment and the vessel itself.
The study conducted by the Engineering Research Institute of the University of Iceland is available here.
The Story of the Rafnar Hull
Having owned several boats and yachts himself, Össur Kristinsson, the inventor of the Rafnar Hull, has had a passion for boats that dates back to his childhood when he built himself a canoe at the age of 15. Then some twenty five years ago while living in Stockholm, Sweden, Össur was inspired by the work of engineer Fredrik Ljungström to create a new hull concept based on Ljungström’s arc-of-circle radius, invented for his circular arc hull. As boat hulls are typically hidden out of sight, this remained one of Ljungström’s lesser known ideas.
Having begun research and development for the Rafnar Hull in 2005, 2011 became one of the most important years of development when Rafnar began a research and development collaboration for tactical boats based on the Rafnar Hull with the Icelandic Coast Guard (ICG) and the Icelandic Association of Search and Rescue (ICESAR). As ICG and ICESAR are among the most demanding end-users of tactical vessels in the North Atlantic, this collaboration effort proved to be invaluable and has since then given Rafnar and the Rafnar Hull technology international endorsement and appeal. A common saying among Rafnar Hull fans is, “if the Rafnar Hull works for the ICG and ICESAR, it'll work for us”.
The Unique Rafnar Hull
What it is and how it works
The Rafnar Hull is a revolutionary hull-and-keel technology that will ultimately disrupt marine industries globally. Confirmed by independent research to be capable of up to 95% fewer slamming impacts than competing deep-v hulls, the Rafnar Hull ensures otherwise unattainable seakeeping in the most extreme marine environments. A product of the harshest conditions of the North Atlantic, the Rafnar Hull has been confirmed by professionals worldwide to provide mariners with endurance and comfort in crafts that are practically impossible to make unsafe. This is achieved without compromising cruising or top speeds, while providing owners with the benefit of lower vessel life cycle cost not only from mechanical and on-board equipment fatigue, but also from medical, disability and insurance related costs. The Rafnar Hull offers a uniquely smooth experience.
When accelerating, the Rafnar Hull raises itself horizontally and maintains planing. The pivot point remains in the hull's center instead of in the stern, which is not forced downwards during acceleration. The keel shape keeps the vessel steady in the water, allowing for unrivaled speed and grip in turns. The Rafnar Hull always remains steady and fixed in the water and almost never slams on waves. Due to the Rafnar Hull's shape, no wake is created behind the vessel. The Rafnar Hull's top speed is only limited to engine output produced.
Benefits of the Rafnar Hull
Up to 95% impact reduction vs. deep-v planing hulls
Exceptionally smooth and comfortable due to limited slam on waves.
Significantly reduced slamming results in less mechanical and equipment fatigue, extending the lifetime of expensive electronic equipment on board.
Greater on-board safety from significantly reduced slamming means reduced risk of injury, lower crew & passenger fatigue and related costs
Precision performance without compromising cruising or top speed.
Immediate handling response with no sliding
No wake created behind vessel, resulting in less water disturbance
Exceptional stability and balance when idle and at speed
High payload capacity without compromising cruising or top speed
Built for work, the Rafnar Hull provides expetional control over one's perimeter and zone of responsibility.
Built for leisure, the Rafnar Hull is the means to an enduring lifestyle of comfort and exploration.