Sail area / displacement
How much sail the boat carries for its weight — its power in light air.
- not published: displacement
How it is worked out
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔

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sunreef-50-exterior-02 — Sunreef Yachts
* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.
From the published figures: CE Category A · LOA 15.2 m · fresh water 800 L
Tags are derived from certified class, length, sail area, accommodation and tankage using the criteria described on the Sources page; an editor may add or remove one.
Classic yacht-design ratios worked out from the builder's published figures, each shown against the bands designers read it by.
How much sail the boat carries for its weight — its power in light air.
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔
How heavy the boat is for its waterline length. Lower is lighter and quicker; higher is steadier and roomier.
displacement (long tons) ÷ (0.01 × waterline length in ft)³
Most builders publish a light displacement. The ratios were defined on a loaded boat, so every boat here reads a little lighter than a surveyor's figure would — all alike, which keeps them comparable.
What the builder publishes about how fast, how strong and how much the boat carries.
Fuel and water on one scale: a tank twice the height holds twice as much.
Certified CE design category A (Ocean): the wind and waves the EU Recreational Craft Directive says this boat is designed to take.
Sheltered waters
Inshore
Offshore
Ocean
Design limits set by the EU Recreational Craft Directive (2013/53/EU), in significant wave height. A category covers the conditions of those below it. It is the limit the boat was designed to, not a promise that it is safe in any conditions within it — that judgement stays with the skipper.
Figures read fromsunreef-catamarans.com/en/sunreef-50-electric/· SPECIFICATIONread 9/18/2026
4 drawings from the builder's page: general arrangement, sail plan, profile.

sunreef-50-layout-11 — Sunreef Yachts

sunreef-50-layout-10 — Sunreef Yachts

sunreef-50-layout-09 — Sunreef Yachts

sunreef-50-layout-08 — Sunreef Yachts
Custom
Polish builder of custom luxury catamarans from Gdańsk, founded in 2002 by Francis Lapp — the Sunreef 50 to 100 sailing catamarans, the 60 to 100 Sunreef Power motor catamarans, each in a Classic and a solar-electric Eco version, the Ultima 44 to 88 motor yachts with a BRABUS edition, and superyacht projects up to a 210-foot power trimaran.
Francis Lapp opened a shipyard in Gdańsk, a city with long traditions of naval construction, establishing Sunreef Yachts' production site and office there in 2002. In 2003 the yard launched the Sunreef 74 CHE, the world's first oceangoing luxury catamaran with a flybridge, which changed the philosophy of multihull design; the 70 Sunreef Power JAMBO of 2008, designed with Laurent Bourgnon, was the first double-deck power catamaran with oceanic range, and the Sunreef Ultimate line of high-performance sailing catamarans followed in 2010. Francis Lapp was named Entrepreneur of the Year at the 2013 World Yacht Trophies, the Sunreef Supreme 68 opened the Supreme range in 2016, and the yard marked fifteen years in 2017 as the Sunreef 88 Double Deck and 40 Open Sunreef Power collected Yacht Style awards in 2018 and 2019. In 2022 the Sunreef 80 Eco, the first yacht with Sunreef's solar skin, was launched and won the Gustave Trouvé Award, followed in 2023 by the German Innovation Award and Multihull of the Year.
Visit brand pageEvery model Sunreef Yachts publishes, by length — where this one sits in the range.
McConaghy Boats
LOA: 15.69 m
Xquisite Yachts
LOA: 16.63 m
Privilège Marine
LOA: 15.24 m
Lagoon
LOA: 14.95 m