Royal Huisman announce PHI as world’s longest motoryacht below 500GT

The Dutch builder has revealed the length of its latest superyacht PHI as being 58.5m (192ft), making her the longest motor yacht in the sub-500GT category.

Royal Huisman first divulged details of custom-built PHI in May 2018, but up until now she has been referred to as a "55m plus" superyacht. Her actual length of 58.5m (192ft) means that when she hits the water in 2021, she will be the longest sub-500 GT motor yacht in the world.

The superyacht is named after Phi, an important number known as the golden ratio and equal to 1.618. It appears numerous times in geometry, art, architecture and many other areas. She is a collaboration between Dutch design firm Cor D. Rover, who worked on the exteriors, London-based interior designers Lawson Robb and Van Oossanen Naval Architects.

CGI of superyacht PHI on the water
© Royal Huisman

The Owner gave an interesting design concept to follow, he wanted a yacht built that had an underlying story that was evident in all aspects of the yacht and one that reflects elements of personal interests.

Amongst similar sized yachts for sale she is noticeable by her sleek, low hull and superstructure profile, whilst onboard PHI has an organic feeling, with connections to the natural world in her layout and design.

Cor D. Rover explains more on how they interpreted the Owner's desires, saying: "We wanted the upper deck, where the Owner has his penthouse apartment, to be closest to the skies, to follow the PHI philosophy with a focus on the galaxy. The main deck, where most daytime guest activities happen, has a more horizontal focal connection with the ocean surface, whereas the lower deck, physically rooted in the water, is strongly ‘connected’ with the underwater-world.”

Notable features include Cor D. Rover’s patented DEPP swimming pool. The pool uses a minimum of fresh water since the body of water can stay in the pool, heated and treated overnight, when not in use. Beneath the lower deck lobby there is the intriguing prospect of an infinite wine-cellar, although full details of that are yet to be released. She also has a fast displacement hull form which means she is extremely fuel efficient.

PHI sleeps 12 guests across six cabins and will be complemented by a 36m (118ft) shadow vessel. She is set to launch in 2021.

CGI showing decks of PHI
CGI of deck area on PHI
CGI showing deck area looking out to horizon on PHI

Whilst PHI will set new standards in terms of length for a sub-500GT yacht, there are many other shapes and styles available. To see the entire market available view all new and used superyachts for sale.

As a custom-built yacht PHI has been created exactly to the Owner’s needs. Explore the full range of custom yacht builders if you are interested in buying a custom built superyacht.