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Lagoon 55 MilleniumvsPrivilège Marine Signature 580

Signature 580 is 2.4 ft longer than Lagoon 55 Millenium (4%). Lagoon 55 Millenium draws the least water, 5.1 ft — 1 ft less than Signature 580. Lagoon 55 Millenium offers up to 6 cabins; Signature 580 at most 5.

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Key differences

Worked out from the published figures below — arithmetic, not opinion.

At a glance

Dark icons are the standard layout; faded ones are what the larger layout adds.

Length : beam is length divided by beam — the higher it is, the slimmer the hull. Multihulls read low by nature.

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.

Model
Lagoon Lagoon 55 Millenium
Exterior sailing

Privilège Marine

Signature 580
Overview
BrandLagoonPrivilège Marine
ModelLagoon 55 MilleniumSignature 580
GenerationUnknownUnknown
Hull typeSailing CatamaranSailing Catamaran
PropulsionSailSail
Production statusIn productionIn production
Production start yearUnknownUnknown
Production end yearUnknownUnknown
DesignerNauta DesignDarnet Design
Dimensions
LOA60.3 ft62.7 ft
Hull length54.3 ft62.7 ft
Beam29.5 ft30.1 ft
Draft5.1 ft6.1 ft
Displacement64,375 lb63,934 lb
Accommodation
Cabins4–64–5
HeadsUnknownUnknown
Berths8–16Unknown
Performance & Rig
Main sail1,109 ft²1,302 ft²
JibUnknownUnknown
GenoaUnknown990 ft²
Upwind sail area1,916 ft²Unknown
Downwind sail areaUnknown1,991 ft²
Engine power110 hp110 hp
Engine count22
Materials
Hull materialUnknownUnknown
Deck materialUnknownUnknown
Mast materialUnknownUnknown
Keel typeUnknownUnknown
Rudder typeUnknownUnknown
Sources

12 of 12 figures here carry the builder's own words

12 of 12 figures here carry the builder's own words

Size, to scale

Each boat's published length and beam seen from above, and its mast height and draft from the side, all drawn on one scale.

From above — length × beam
0 ft10 ft20 ft30 ft40 ft50 ft60 ftSignature 580: 62.7 ft × 30.1 ftLagoon 55 Millenium: 60.3 ft × 29.5 ftSignature 58062.7 ft × 30.1 ftLagoon 55 Millenium60.3 ft × 29.5 ft

Outlines are schematic; the dimensions are the builder's.

From the side — height above and depth below the water
WaterlinePerson, 5.9 ftLagoon 55 Millenium: 98.7 ft / 5.1 ft98.7 ft5.1 ftLagoon 55 MilleniumSignature 580: air draft not published / 6.1 ftair draft not published6.1 ftSignature 580

Speed, power & tanks

What the builders publish about how fast, how strong and how far — each figure on one scale for every boat.

Tanks

One scale per liquid across every boat: a tank twice the height holds twice as much.

  • Lagoon 55 Millenium

    Fuel291 gal
    Water254 gal

    16 gal of water per berth

  • Signature 580

    Fuel256 gal
    Water238 gal

How they sail, in numbers

Classic yacht-design ratios worked out from each builder's published figures. They compare boats; they don't grade them.

Sail area / displacement

How much sail the boat carries for its weight — its power in light air.

ModestCruiserPerformanceRacing162024Lagoon 55 Millenium: 19.1Signature 580: 22.9
  • Lagoon 55 Millenium19.1· Cruiser
  • Signature 58022.9· Performance
How it is worked out

sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔

Lagoon 55 Millenium: published upwind sail area

Signature 580: mainsail + genoa, added up

Displacement / length

How heavy the boat is for its waterline length. Lower is lighter and quicker; higher is steadier and roomier.

UltralightLightModerateHeavyVery heavy100180270350Signature 580: 147
  • Lagoon 55 Milleniumnot published: waterline length
  • Signature 580147· Light
How it is worked out

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.

Worth adding to this comparison

The boats most like the ones above, by hull form, size and use.