NISI’s XPRESSO Series Introduced

April 8, 2014

Yachting Journal

  • Image: NISI Yachts
  • Image: NISI Yachts
  • Image: NISI Yachts
  • Image: NISI Yachts
  • Image: NISI Yachts

  • Image: NISI Yachts

  • Image: NISI Yachts

  • Image: NISI Yachts

A Spirited Double-Shot of Performance, Efficiency, and Stability

The first model in NISI’s XPRESSO multihull series—NISI 50 XPRESSO—represents the culmination of decades of development and design in the power multihull market: a high speed multihull purposely designed and developed by people with a unique combination of knowledge and skills.

Codenamed “X50,” this XPRESSO is introduced as the fifth NISI model in the company’s collection.

The highly anticipated X50 is the first multi-hull to focus on the desires of traditional monohull owners. Drawing on demands from traditional yacht owners and NISI’s own megayachts, X50’s arrival brings unprecedented styling, strength, large social areas, and performance.

Concept and design come from the engineering team at NISI Yachts with naval architecture by Setzer Yacht Architects. Based on established interest from the international yachting community, X50’s mission is to deliver exceptional and efficient offshore performance with unprecedented exterior and interior spaciousness.

“Like all NISI Yachts, X50 delivers a unique sense of occasion,” said Christos Livadas, NISI Yachts Founder and CEO. “We’ve engineered the X50 to fill a need that infuses the best of mono- and multi-hull designs. One that embodies a balance between the design disciplines of performance and effective space planning. Her expansive layout rivals even our own, larger megayachts to offer abundant areas to mingle and relax in. She is exceptionally comfortable in open seas with exceptional speed while delivering superior fuel efficiencies. She is the perfect yacht for active, social owners looking for adventure—and the power to get there.”

NISI and partners have quietly been conducting confidential R&D on a hydrofoil design to be featured on the company’s top-of-the-line GTX model. “The entry-level models deliver exceptional performance in the 20 to 30 knot range,” said Don Marshall, NISI Yachts Product Development Engineer. “This newest feature, which we refer to as the ‘SonicFoil’, takes an already spectacular platform to a whole new level, with top speeds in excess of 35 knots—while reducing fuel consumption by nearly 50% compared to monohulls. She is geometrically constant and exponentially exhilarating.”

Extensive tank testing has been conducted with a life-sized ¼ scale model in Zagreb, Croatia—Europe’s longest testing facility—over a one-year period. Data from 34 test runs and numerous hull tweaks were evaluated to set the final design.

Based on light-weight composite construction techniques developed for the NISI product line, the 50 XPRESSO takes advantage of this experience to develop a third generation hull form that reaches unprecedented levels of efficiency and speed in a vessel of her size.

Currently, the X50 is the only multihull in the motoryacht class with a clean-sheet design dedicated to taking advantage of pod propulsion systems; the X50 is the only multihull that offers pod propulsion in this size range.

Against the backdrop of numerous multi- and monohull comparables, the NISI X50 offers a platform that excels in delivering a combination of four key advantages to her ownership.

1. Higher level of safety and ease of handling
a. Open 360-degree sightlines from all vantage points in the salon deck and helm station.
b. Proprietary structural engineering that draws from proven aerospace and automobile racing design which “cages” the hulls and wing board to tie them together as a single unit, providing more than double the stiffening strength of traditional bulkhead designs.
c. Engineered with a mission profile of 35-knot+, making the X50 over-engineered for an owner’s typical 18-25 knot cruising envelope.
d. Double-hull bottom from the bow to forward of the engine room, substantially limiting water egress in the event of catastrophic collision of underwater objects.
e. Kevlar composites of the engine room’s hull bottom for added shearing strength.
f. Fire resistant bulkheads between the engine room and living quarters.
g. Hull skegs providing additional protection in the event of groundings with an added level of prop protection.
h. Azimuthing pod propulsion drives and joystick for ease of handling and docking (Cummins ZEUS).

2. Performance – 20% more speed than comparable multi-hulls, 45% more than comparable monohulls, per horsepower
a. Flexible performance from 8kt-35kt+.
b. The only multihull in the “motoryacht” class in the 50’ size range that offers performance in excess of 30-knots.
c. Pod propulsion delivers >20% performance over standard shaft drives.
d. Optional X50 Sonicfoil delivers an additional 20% speed gain above and beyond all other improvements.

3. Reduced operating costs, ease of maintenance–Superior efficiency 20% over comparable multihulls, 40% better than monohulls
a. NISI’s X50’s standard model delivers 20% better fuel efficiency in the 18-28 knot envelope (>35% vs. monohulls).
b. The GTX model delivers >30% fuel efficiency in the 20-35 knot range (>45% vs. monohull).
c. The use of modern cored composites and carbon fiber reduce weight while increasing strength. Less weight equals less fuel burn.
d. Cummins Zeus and Volvo IPS pod propulsion systems deliver 20%+ better efficiency. Coupled with the Sonicfoil even greater efficiencies in the 40% range are gained.
e. Advances in modern electrical systems reduce generator capacity needs by 30%. Smaller generator saves fuel and weight.
f. Optional Li-Ion systems give the yacht exceptional power autonomy, reduce generator use by over 50%, and allow for near silent operation when away from shore power.
g. Special ship’s systems arrangement wherein there is no machinery in the engine room except the engine. In the pursuit of maturing the yacht industry to the standards of the 21st century automobile, X50 underwent extensive space planning to reorganize all non-propulsion systems into dedicated machinery holds located in the foredeck section of the yacht. All domestic systems including air-conditioning, air-handlers, water pumps, inverters, toilet systems, et. al., are contained here. This eliminates the need for owners or their captains to perform a substantial amount of maintenance tasks in tight or hot engine rooms, or common living areas. The result is added convenience, faster maintenance and trouble-shooting, and an additional element of safety.

4. Comfort & Conveniences
a. Multi-hulls by nature deliver a “softer” ride than monohulls.
b. X50’s higher wing board and forepeak chest take multihulls a step further with an improved reduction in “slamming”.
c. Interior headroom exceeds 7’ 2” while maintaining an exceptionally sleek exterior profile.
d. Reduced air draft (15’ without hardtop; 21’ with hardtop/arch) for better bridge clearances.
e. SonicFoil delivers enhanced stability and comfort with a 70% reduction in G-forces; in effect, a shock absorber on water.
f. Enhanced acoustic dampening is drawn from NISI’s megayacht engineering: X50 is supplemented with host of treatments to reduce noise and vibration including a 6mm thick ISO-barrier sound paint coating on internal hull surfaces.
g. Proven hybrid lithium-ion electrical systems installed on NISI projects eliminate the need for continuous generator operation. Enjoy silent-mode at night, with air-conditioning.
h. Innovative carbon fiber beach platform allows for quick, safe launch and retrieval of the tender. When not in use, adjustable safety u-rails expand the aft-deck area to include the platform as an additional unique space to socialize and relax.
i. Dedicated machinery holds in the yacht’s foredeck, reducing unwanted noise and vibration due to air-handers and pumps commonly found in owner’s living areas.