50m motoryacht Home
A 50m fast-displacement hull form with hybrid propulsion, HOME is the world’s first yacht of her kind. Pairing comfort with efficiency, and capable of silent cruising, she demonstrates the progressive capabilities of Dutch pioneering naval architects Van Oossanen.
Following extensive research and development, the iconic fast-displacement hull form is now on its third optimisation. The result is superior efficiency in every way – HOME is 48% more efficient than other 50m yachts when tested during accurately comparable circumstances – and a superior level of comfort. “The combination of both efficiency and comfort is very important to us,” says Perry van Oossanen. “Many companies focus on comfort alone, and put in larger engines, but at Van Oossanen, we look to create a hull that is both efficient and comfortable – that’s the combination we’re always looking for, and have achieved with HOME.”
Her chiselled vertical bow with sharp lines gives her a progressive buoyancy when carving through rough waters, not to mention a good seakeeping capacity. Hydro-dynamically it lengthens the waterline, which again is good for efficiency, but also allows the crew accommodation to be placed further forward, creating more internal space. Due to there being less flare in the bow, the pitching motions are gentler, which increases comfort, and reduces the chance of seasickness.
The efficiency continues when it comes to the yacht’s fuel consumption. Hybrid propulsion was investigated during the project, and deemed to be particularly beneficial when cruising at lower speeds. The engines are reasonably sized – just two MTU 12V 2000 M61 engines of 600 kW each – but when run at a lower speed (below 10 knots) they become highly inefficient, burning 30-40% more fuel. The hybrid propulsion allows the owner to offset the fuel consumption with the use of generators, without compromising on speed, which undoubtedly creates a hugely versatile boat.
A full aluminium motor yacht below 500GT with shallow draft, HOME underwent intensive sea trials in the North Sea for five days in calm sea conditions with waves of up to 0.5m and light breeze. The results were impressive: not only did she exceed the contractual maximum speed by 0.9 knots in the traditional diesel engine mode, but also in the ‘quiet mode’ (she is able to run in different modes, including silent cruising on the generators, or using the electric engine as a diesel booster to achieve maximum speed).
Thanks to two 127kW water-cooled DC electric shaft motors, HOME exceeded the predicted speed by 1 knot reaching 10 knots with noise and vibration levels well below the predicted figures. In the Owner’s suite, the noise level is 37db (vs the forecasted 46db), quieter than soft rain! In addition, the noise levels in the lower deck guest accommodation are impressively low, at just 40db. At 12 knots, HOME has a fuel consumption of 98 litres per hour (excluding generators) and at 10 knots this further reduces to a staggering 57.5 litres per hour, which for a 50m yacht, displacing 295 tons and with a Gross Tonnage of 499 is a staggering achievement.
As well as bearing an elegant, head-turning exterior, HOME has a transatlantic range of 3,750 miles, which is achieved with a fuel capacity of just 45,000 litres. There is also the potential of installing large engines in future models if required by the owner, once again epitomising the forward-thinking versatility within the Van Oossanen DNA.
“The brief from the Dutch shipyard, Heesen Yachts, was to make the most efficient hull shape for the yacht that they wanted to build,” explains Perry van Oossanen. “We continuously invest in research and development – 20% of our man hours are spent in R&D, and that’s what gives us our edge on the market – so for us, HOME was a fantastic platform on which to showcase our continuous improvements, and to create the world’s first combination of hybrid propulsion with fast displacement.”