Displacement Motor Yachts under 500 GT
RÜYA
Interior design: Sorgiovanni Designs
Builder : Alia Yachts
Rüya's owner wanted to focus on cruising comfort rather than speed. Although the specifications emphasized a gross tonnage below the 500 GT limit, he asked for an amount of living space usually associated with 45 to 50 meter yachts.
The solution was a clever exploitation of the advantages of advanced composite construction, which allowed much more accommodation on the main and upper decks, without compromising weight and stability. An ample 8.7 meter waterline width improves seaworthiness and comfort. In the bow, the depth allows the storage of tanks, under the crew area. A 2.4 m deep keel equips the boat.
The lines of the displacement hull are flattened at the back for better buoyancy and stability. Rüya is capable of cruising smoothly at 10 knots and with enough range to cross the Atlantic at 11 knots. It is equipped with a Caterpillar C32 ACERT engine of 750 kW capable of offering top speeds of 14/15 knots thanks to the weight savings of the construction.
Displacement Motor Yachts above 500 GT
MADAME KATE
Naval architecture : Amels and Damen Group
Builder: Amels
The magic lies underwater and along the entire waterline that begins with Tim Heywood's Scimitar bow. This innovation of Damen's Axe Bow commercial concept was developed and tested in partnership with Delft University and the Marine Towing Test Facility to provide the owner with dry, comfortable and stable acceleration.
Two pairs of short keels increase the width for better stability, but not at the expense of excessive drag. The yacht measures 1,140 GT and has a fully loaded displacement of 1,145 tons. The 1,500 kW diesel engine offers a top speed of 16 knots. In conjunction with a generator, it consumes 320 liters per hour at 13 knots. The added volume forward creates new crew and technical spaces that enhance the owner's privacy.
Semi Displacement Motor Yachts
Iron Man
Naval Architecture: Azimut Benetti SpA
Builder: Benetti Shipyard
Benetti's 38.1m Vivace model, called Iron Man presents an interesting application of azimuthal propulsion in a relatively small motor yacht with an innovative hull, designed for a smooth transition from displacement to semi-planing speeds with a maximum speed of 24.5 knots - two knots faster than expected.
An 18-month development period of what Azimut Benetti calls its D2P hull uses CFD to refine each element and appendage, evolving the hull shape with a pair of asymmetrical chines and a piercing wave bow.
Its smooth underwater profile that narrows at the front increases its cruising speed by 20%. At 11.5 knots, Iron Man burns 100 liters per hour. A major budget control using carbon fiber in the hull resulted in a 40% weight reduction compared to traditional structures. Azimut Benetti chose a pod drive with a forward propeller for increased efficiency and maneuverability.
