Sail area / displacement
How much sail the boat carries for its weight — its power in light air.
- 19.3· Cruiser
How it is worked out
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔
mainsail + jib, added up

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f-57-exterior-02-2560x1440 — Faurby Yacht A/S
* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.
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
mainsail + jib, added up
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.
Figures read fromfaurby.dk/yachts/faurby-570-ds· Specificationsread 9/13/2026
Semi-custom
Danish semi-custom builder of hand-finished cruising yachts in two lines — the Performance Cruiser (335 to 460) and the Deck Saloon (360 DS to 570 DS, evolved from Nordship) — at Lunderskov, Jutland, with roots going back to 1976.
Visit brand pageEvery model Faurby Yachts publishes, by length — where this one sits in the range.