“Trieadrieame”: Innovative Tri-Hull or Trimonoran

Date: Issue 103 - January 2021

The “Triade” concept, developed from an idea by Dutch engineer Mr. Gerard Jelle BILKERT, is a trimaran in which the centerline of the side hulls, in transverse view, is set at a specific angle to the vertical. This arrangement of the side hulls allows for a nearly symmetrical hull form when the hull is operating at heel angles approximating those of a sailing yacht beating to windward. This arrangement also allows for a significant reduction of the phenomenon referred to as “box slamming”, which occurs in the case of conventional catamaran, trimaran and SWATH hulls in waves, when the deck between the hulls is hit from below by a wave. The decreased spacing between the hulls with increasing height above the water surface of the Triade hull allows for more significantly more damping in heave and pitch than in the case of more conventional hull forms. In addition, the Triade concept possesses positive stability up to heel angles in excess of 90 degrees, the angle of vanishing stability being considerably higher than in the case of other multi-hull configurations.

BILKERT designed his dream hull (based on a monohull with two hulls added symmetrically on either side) and introduced a brand-new concept in shipbuilding with a phenomenal Trimonoran. A safer hull with more space, which would be economical to use. It was a huge undertaking but it certainly resulted in an innovating design. After years of dedication, working on every aspect of the design, BILKERT began realizing that a game changing shipbuilding design had been born.  It was an innovation that had to potential to change the maritime world, it was undoubtedly more than just an updated design.

The potential and the benefits of the preliminary new hull drew the attention of the Dutch Ministry of Economic Affairs and the Foundation for the Coordination of Maritime Research.  With their strong support in the project, subsidies for research and development were granted to further the project.  The world-renowned Maritime Research Institute MARIN located in the Netherlands created 1:5 scale models with which tests were conducted in their deep water-towing tank.

The results were very promising and the concept resulted in a comfortable hull for great stability and safety, less water resistance (which equates to improved efficiency), little draft and it also provided a large deck space for professional and recreational use. When used in a motor vessel, the hull helped in fuel savings, and this was a major improvement to the vessel, let alone an important and necessary component in minimizing environmental impact while also contributing to the sustainability of the hull design.

Later, starting from 2010 Dutch Naval Architect Van OOSSANEN developed and optimized the design for BILKERT, using state of the art computer simulation programs (CFD). These computer calculations demonstrated a decrease of more than 30% in fuel consumption for motorboats. Architect OOSSANEN presented a final report containing conclusions, which meant a green light for the tri-hull dream and this was just as Jelle had imagined it.  In essence this was the moment that the Trieadrieame project was born. OOSSANEN compared both the resistance and speed of the Trieadrieame with existing motor yachts and a well-known 50 feet sailing boat.

In order to bring the innovative design to life, AnwigemA B.V. company was formed and focused primarily on the Trieadrieame (try a dream) project. The company invested in an application for model protection and a design patent successfully obtained the international model protection and NL patent for the hull design (project Trieadrieame) which is called Trimonoran. Model protection exists in Australia, Brazil, China, Europe, South Korea, Turkey and the USA. The patent granted in the Netherlands included a Patent Cooperation Treaty for over 140 countries.

AnwigemA B.V. is now able to build 8 to 25m dream vessels with the revolutionary hull concept Trieadrieame. It was the dream of a tri-hull that was a better ship than a monohull, catamaran or trimaran in every way.

The Trieadrieame, or the innovative Trimonoran comprises three slim hulls (providing larger deck surface, spacious interior) and wings (minimizing resistance, making the boat faster, producing more stability compared to conventional monohulls).

A few benefits of the innovative Trimonoran:

Speed gain of up to 30% when used in motor yachts;

Speed gain of up to 50% when used in sailing yachts;

Fuel savings ensure long range;

Smaller fuel tanks can be used, saving space and weight;

High stability for safe and comfortable sailing;

Large deck and hull space;

Relatively small drag;

Less water resistance than traditional monohulls;resistance 

No need for a ballast weight;

Seaworthy design;

Realization of the detailed design is relatively simple.

Both resistance and speed are compared with an existing motor and sailing yacht. The tri-hull has less resistance so it easily reaches speeds of twenty knots depending on engine power or sail area. The combination of lower fuel costs, larger living space, more safety due to stability proves the economy value and commercial attractiveness of the design.

The hull design can be utilized in a wide range of applications like small ferries, pilot and motorboats (as well as sailing) yachts from 12.5 to 25 meters, sloops or tenders from 7.5 to 12.5 meters. Faster commercial or military applications, merchant ships, passenger ferries and super yachts need more research. 


The Trimonoran is extremely suitable for hybrid designs saving significant energy. Trieadrieame offers comfort, safety, space, stability, easy sailing with speed for sailing yachts.

The model really comes into its own when light construction materials are used:

Synthetic materials and (wood) composite materials


Steel is possible in a limited way

The combination of lower fuel costs, larger living space and more safety adds to the commercial attractiveness of the concept. With some modifications the model also is suitable for use in commercial shipping, as ferries and naval ships. 

Escalade: World’s First Trimonoran Power Yacht

Designed by award-winning Turkish yacht and naval designer Baran AKALIN in cooperation with Dutch company AnwigeA B.V., Escalade is a new generation power yacht using a trimonoran hull that claims to offer the efficiency and stability of a trimaran with the speed and volume of a monohull. According to the layouts, the interior decoration was made by the British interior designer Celia SAWYER. Escalade won the Bronze Award in the international design competition 'A Design Award'. It is not wrong to say that this design was indeed at 2nd place in its category, whereas the platinum and gold awards had no award winners. At the same time, it was nominated for awards in separate categories, both interior and exterior design, in the ‘The International Yacht & Aviation Awards’ competition. Escalade was shortlisted for the Concept Under 40 Meters Award in The International Yacht & Aviation Awards 2020. 

As a new generation luxury motor yacht, Escalade is one of the most unique yachts in the market on the trimonoran type hull, where all the details are specially designed for it. The concept design delivers a comfortable hull with great stability and safety, less water resistance, little draft and lots of deck space for professional and/or recreational use. The hull proved to save a considerable amount of fuel, which is an important improvement and a necessity nowadays.

Escalade has four large and comfortable cabins with their own bathrooms and a crew area for two people. There is a large master cabin at the bow, one VIP cabin and two guest cabins on the lower deck. The garage has enough space for the tender boat and two jet skis. There is also a transom lid that can open and slide down to the water surface to transform into a swimming platform.

Although there is a seating area at the stern on the main deck, there are large sunbathing areas on both sides of the Escalade. There is also a large sunbathing area at the bow.  It has a very unique saloon, which has never been seen on a boat before, through two different doors apart from the stern seating area and two separate doors from the port-starboard sides. The saloon includes a kitchen on the starboard side, a "lounge area" on the pier side, and a raised dining area, a sitting group and a giant cinema screen in the middle of these sections. These large areas can only be seen in catamarans of the same size.

Going up to the flybridge with a central staircase just in front of the stern seating area, there is a special jacuzzi with a glass bottom and the staircase passes under this unique jacuzzi and gives a feeling of transition to a magical area. Antennas and satellites/domes on the upper deck are positioned especially below the eye level as much as possible to provide the 360-degree sea view. In addition to these features, Escalade aims to provide its guests with perfect moments in the dining and bar area, sitting area, control console and large sunbathing areas.

Escalade does not use standard shaft and propeller due to its special body structure. The engines are positioned longitudinally in the middle body and power the propellers connected to the hydrofoils on the stern with oil pressure with a ‘hydraulic propulsion system’. This system can also be integrated into the hybrid system.