HREKO has wind, diesel fuel and electric powered drive while the concept is of a hybrid between a performance sailboat hull, a catamaran and a RIB (Rigid Inflatable Boat). Combining underwater catamaran-like tanks/floats with RIB-like floats/tanks above water, on a light performance hull made of composite materials allows HREKO to be twice as light but have superior initial stability compared to a centreboard keel cruiser of the same size. Energy production and low displacement allows up to 50% less fuel consumption! The stability curve and sea behaviour is between that of a single-hulled sailing boat with a classic keel and that of a catamaran. I believe this concept of stability will be used more often in the future simply because it makes principles such as lightness, speed, stability, shallowness, comfort and safety, possible. A RIB type of dinghy that slides in the stern like a bayonet is a structural part of the hull during sailing. It extends the water line considerably, allowing a 10 m boat to have some characteristics of a 40-footer. When moored in a marina it can serve as stern gangway. Longitudinal “RIB” floats are in fact water ballast tanks lined with 10 cm thick polyethylene sponge. As it covers a significant portion of the hull, it renders the fenders useless and provides additional sound and thermal isolation. HREKO is not suitable for regattas because of too little sail coverage when sailing upwind. It might be slow to manoeuvre, although the fact that it keeps direction easily is beneficial for autopilot. Two long but low keels allow for easier transport and maintenance on land. This also makes it suitable for shores of Western Europe where there are large tide fluctuations.