Sail area / displacement
How much sail the boat carries for its weight — its power in light air.
- 22.8· Performance
How it is worked out
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔
published upwind sail area

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Solaris 40 - hero shot — Solaris
* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.
From the published figures: LOA 12.36 m · upwind 100 m²
From the published figures: LOA 12.36 m · 3 cabins · 2 heads · fresh water 350 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
published upwind sail area
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
The share of the weight carried in the keel — a rough guide to stiffness, though how deep that weight sits matters as much.
ballast ÷ displacement × 100
Ted Brewer's measure of how gently a boat moves in a seaway. Higher means a slower, easier motion.
displacement (lb) ÷ (0.65 × (0.7 × LWL + 0.3 × LOA) × beam^1.333), lengths in ft
A guide from the inquiry after the 1979 Fastnet race: below 2 was taken as suited to ocean passages. It ignores hull shape and where the ballast sits.
beam (ft) ÷ (displacement as ft³ of seawater)^⅓
Roughly the speed a displacement hull reaches before it has to climb its own bow wave.
1.34 × √(waterline length in ft), in knots
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.
A figure marked with a quote mark was read from the builder's page. Open it for the exact line, the page and the date.
Figures read fromthe builder's page
1 drawing from the builder's page: general arrangement, sail plan, profile.
Films of this model from the builder's official YouTube channel (SOLARIS Yachts). They are the builder's own; the figures above are the reference.
Solaris 40 ST
SOLARIS Yachts · 9/9/2024
Videos whose title names the 40, from the channel the builder's site links; last checked 9/30/2026. Playing one loads YouTube's player, which may set cookies.
Semi-custom
Italian builder of performance sailing yachts, founded in 1974 in Aquileia, now also producing motor yachts under Solaris Power and the CNB brand.
Solaris was founded in Aquileia, in the province of Udine, in 1974. Its milestones run through the models: the Solaris 47 of 1979, the Solaris One of 1984 and Solaris Zero of 1986, the 48cc of 1991, the 47 Express Cruiser of 1997, the Solaris 52 of 2000 and the Solaris One 48 of 2006. The Solaris 37 of 2012 opened the current era, the first Solaris Cup was sailed in 2014, and the range was renewed with the 50 in 2017, the 44 in 2018, the 111 flagship in 2021, the 40 in 2022 and the 55 in 2024.
Visit brand pageEvery model Solaris publishes, by length — where this one sits in the range.