PHI TURNING HEADS
The 58.5m / 192ft motoryacht PHI, under power and turning heads: developed and constructed to remain below 500GT, she is by far the longest motoryacht in this category, worldwide, based on current Classification rules.

PHI – length overall: 58.5m / 192ft – gross tonnage: below 500 GT – hull and superstructure: aluminium – general concept, exterior design & interior layout: Cor D. Rover – interior design: Lawson Robb – naval architecture: Van Oossanen Naval Architects – project management / owner’s representative: Guy Booth – builder: Royal Huisman (2021)

“With such a powerful vision, a demand for the absolute highest level of quality available anywhere and such difficult engineering challenges, Royal Huisman were clearly the best partner to build the boat.”
Guy Booth – Owner’s representative and project management
PHI: 20+ knots during second trial on the North Sea (wind: Bft 5 and waves up to 1.4m / 5ft). PHI’s normal cruising speed is 12 knots and her maximum is over 22 knots.

“As a naval architect you are always looking to make something more efficient, more comfortable. One of the first things you learn about as a naval architect is the length / displacement ratio. If you make a boat longer without making it heavier it becomes so much more efficient and more comfortable. It improves all aspects.” explains Perry van Oossanen, PHI’s naval architect, during The Superyacht Forum 2021.
“PHI is 30% more efficient than a traditional 500GT motor yacht. I hope this new hull shape is more than a niche, it’s a new direction for the market. In order to gain the reductions in greenhouse gases we need to achieve, it could be a valuable step.” Perry van Oossanen adds.
Guy Booth continues: “At 22 knots you can barely hear the engines anywhere inside. You wouldn’t know you were moving unless you looked out of the window. Something of this size moving at 22 knots in silence was quite weird. It feels like you are stationary until you look out of the window and see everything flying past.”