Royal Huisman"Sky", the highest slup in the world

Fridtjof Gunkel

 · 12.11.2025

Folding side sections and a flybridge.
Illustrations: Royal Huisman
Designed and thoroughly engineered: The 81 metre long Slup "Sky" only needs to be built and will be available as early as 2030.

The Dutch shipyard Royal Huisman has unveiled a sailing yacht project that sets new standards. With a mast height of 93 metres, the 81-metre-long Slup will exceed the current world record by around four metres. This height corresponds to the Statue of Liberty from the ground to the torch. The special thing about this project is not only its dimensions, but above all the stage of development: "Sky" is ready for construction. While it usually takes six or more years from the first architect briefings to the delivery of a customised superyacht, "Sky" can be handed over to the new owner as early as spring 2030. This is possible because the design, naval architecture and most of the engineering work have already been completed. All technical challenges have been identified, analysed and solved, according to the renowned shipyard, which specialises in large vessels.

Design team also works for Nautor

Malcolm McKeon Yacht Design ("Mmyd") is responsible for the ship design and the exterior design. The British design studio is currently very popular, and is also working on the new Aluminium swans. The team can already look back on a successful collaboration with Royal Huisman - the 60-metre yacht "Sarissa" was the result of this partnership. With "Sky", McKeon has applied his experience on an even larger scale and aims to unite seemingly opposites: an 81-metre yacht that, despite its imposing size, should offer the manoeuvrability and simplicity of a performance sailing yacht under 50 metres.

The interior was created by Winch Design, a studio known for its sophisticated, coastal-inspired interiors that balance luxury with cosiness. The interior can still be customised to the owner's individual wishes without compromising the basic design aesthetic.

The hull of "Sky" is made entirely of aluminium, with particular attention paid to optimising weight distribution. This construction method, combined with a long waterline and a deep lifting keel, forms the basis for exceptional sailing characteristics. The yacht is designed to sail faster than the wind - and even faster than a motor yacht of comparable length. This performance is supported by double carbon composite rudders, integrated sail control and Rondal's carbon rig. Rondal, the sister company of Royal Huisman, is supplying the most technically demanding element of the entire project: a 93 metre high carbon mast that sets new standards in superyacht sail construction. In combination with the performance-orientated hull design, "Sky" is set to become an XXL performance cruiser.

Hybrid drive with Lloyd's certificate

The yacht has a hybrid-electric propulsion system based on electric rotating propeller nacelles. These are powered by four main generators combined with a battery bank. This system carries Lloyd's "Hybrid Power" certificate - an official recognition of the innovative propulsion architecture. The decisive advantage of this system lies in its versatility and environmental friendliness. In harbour operations or at anchorages, it enables quiet, exhaust-free and emission-free operation. In environmentally sensitive areas, "Sky" can operate in pure zero-emission mode. The Huisman system makes it possible to generate energy while sailing, which is fed into the battery bank. This not only significantly reduces fuel consumption, but also minimises the running times of the generators. The deck layout of ""Sky"" was developed with special attention to the connection between interior spaces, exterior areas and the water. The flybridge and various seating areas offer versatility from outdoor living with all-round visibility to sheltered areas with sun protection.

Multi-level deck concept

The multi-level connection to the water is particularly well thought out. The aft beach deck has a retractable bathing platform that provides direct access to the sea. Amidships, there is a full-width lounge area with folding platforms on both sides, providing additional usable space directly on the water. The cockpit is equipped with folding bulwarks that can be opened or closed depending on the conditions and requirements. This sophisticated architecture creates multiple entertainment and relaxation zones and allows easy access for swimming, diving and all kinds of water sports. Owners and guests do not experience the distance one would expect from a yacht of this size, but an immediate connection to the sea - a feeling normally reserved for smaller yachts.

Huisman has worked hard

What makes ""Sky"" an exceptional opportunity is the combination of great ambition and the groundwork that has already been done. While a fully customised project from the ground up is fraught with uncertainties, technical challenges and time uncertainties, with "Sky" all of these hurdles have already been overcome. The design has been finalised, the ship's architecture is in place and the engineering work has largely been completed. All technical systems have been validated, challenges identified, analysed and solved. This not only significantly reduces the technical risk, but also shortens the construction time by around 50 per cent compared to a completely new build. Nevertheless, there is still enough room for personalisation. The interior layout and styling can be customised according to the wishes of the future owner, while the basic technical architecture and exterior design retain their proven form.

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Sky" technical specifications

  • Overall length: 81 metres
  • Mast height: 93 metres
  • Fuselage material: All aluminium
  • Keel: Lifting keel
  • Rudder: Double carbon composite rudder
  • Propulsion system: Electric rotating propeller nacelles
  • Generators: 4 main generators
  • Energy storage: battery bank with recovery function

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