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

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84590 — Ferretti Group (Wally)
* A standard reference image, not the actual boat — shown to help visualise this model's published dimensions.
From the published figures: SA/D 38.1 (upwind 635 m², displacement 69800 kg) · 3 cabins
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.
Figures read fromwally.com/en-us/Fleet/Model/p/20-304-459-PUBread 9/18/2026
6 drawings from the builder's page: general arrangement, sail plan, profile.

Profile — Ferretti Group (Wally)

Main Deck — Ferretti Group (Wally)

Main Deck — Ferretti Group (Wally)

Main Deck - Performance — Ferretti Group (Wally)

Lower Deck — Ferretti Group (Wally)

Lower Deck - 3 cabins — Ferretti Group (Wally)
Semi-custom
Luca Bassani's avant-garde marque, founded in 1994 and a Ferretti Group brand — seventeen fleet models from the 12-metre wallynano 37 to the 45.7-metre wallywind 150, spanning the wallytender and wallypower motor boats, the wallywhy yachts, the wallyrocket racers and the wallywind fast-cruising sloops, all in carbon and all built on the rule that there are no rules.
In 1991 the yachtsman Luca Bassani built a family yacht with the performance of a maxi, Wallygator -- carbon construction, a self-tacking jib, swept-back spreaders without running backstays, flush decks, a forward owner's cabin, and what the yard's timeline calls the first carbon mast in the world after the 1992 New Zealand America's Cup boat -- and in 1994 he founded Wally, launching the ketch Nariida, the first all-carbon yacht. Genie of the Lamp of 1995, a 24-metre sloop one person could handle, introduced push-button sail handling and the open deck; Tiketitan of 1998 pioneered the 'Terrace-on-the-sea' beach club and the first canting keel on a big cruiser, Wally B rethought interiors, and the Wally Class of 1999 grew into the largest fleet of racing superyachts. Wally entered power boats with the wallytender in 2001 and the wallypower118 of 2003, with its vertical bow and glass superstructure, which was shown at San Francisco's Museum of Modern Art in 2004, the year Tiketitoo won the Compasso d'Oro; Ryokan 2 won it again in 2008, and wallyace of 2012 moved the brand into displacement motor yachts. In 2019 Wally became a brand of the Ferretti Group, which relaunched the wallytender with the 48, opened the Casa Wally shipyard in Forlì in 2021 for the tender and power lines alongside the wallywhy200, and launched the wallypower58 in 2022.
Visit brand pageEvery model Wally publishes, by length — where this one sits in the range.
Boats this boat's designers also drew, for other builders too. Credits are grouped only where the names clearly agree, however each builder spelled them; an unclear one is left out.