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Balance 464vsSeawind 1370

Balance 464 is 1.6 ft longer than Seawind 1370 (4%). Seawind 1370 is the heaviest at 27,117 lb, 14% more than Balance 464. Balance 464 carries the most sail for its weight (SA/D 24.8, Racing); Seawind 1370 the least (22.1, Performance).

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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
464 - Exterior

Balance Catamarans

Balance 464
Seawind-1370-hero-banner-V2

Seawind Catamarans

Seawind 1370
Overview
BrandBalance CatamaransSeawind Catamarans
ModelBalance 464Seawind 1370
GenerationUnknownUnknown
Hull typeSailing CatamaranSailing Catamaran
PropulsionSailSail
Production statusIn productionIn production
Production start yearUnknownUnknown
Production end yearUnknownUnknown
DesignerPhillip Berman & Anton du ToitUnknown
Dimensions
LOA46.6 ft44.9 ft
Hull lengthUnknownUnknown
Beam24.9 ft24.9 ft
Draft3.7 ft–7.4 ft4.3 ft
Displacement23,810 lb27,117 lb
Accommodation
Cabins33
HeadsUnknownUnknown
BerthsUnknownUnknown
Performance & Rig
Main sail826 ft²861 ft²
Jib406 ft²388 ft²
GenoaUnknownUnknown
Upwind sail area1,281 ft²Unknown
Downwind sail area1,865 ft²2,368 ft²
Engine powerUnknown40 hp
Engine countUnknown2
Materials
Hull materialE-glass/carbon-fiber-reinforced vinyl-ester foam-coreUnknown
Deck materialUnknownUnknown
Mast materialUnknownUnknown
Keel typeUnknownUnknown
Rudder typeUnknownUnknown
Sources

10 of 11 figures here carry the builder's own words

Figures read fromseawindcats.com/seawind-1370/read 9/13/2026

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 ftBalance 464: 46.6 ft × 24.9 ftSeawind 1370: 44.9 ft × 24.9 ftBalance 46446.6 ft × 24.9 ftSeawind 137044.9 ft × 24.9 ft

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

From the side — height above and depth below the water
WaterlinePerson, 5.9 ftBalance 464: 70.9 ft / 7.4 ft70.9 ft7.4 ftBalance 464Seawind 1370: 70.9 ft / 4.3 ft70.9 ft4.3 ftSeawind 1370

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.

  • Balance 464

    Fuel211 gal
    Water185 gal

  • Seawind 1370

    Fuel137 gal
    Water159 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.

ModestCruiserPerformanceRacing162024Balance 464: 24.8Seawind 1370: 22.1
  • Balance 46424.8· Racing
  • Seawind 137022.1· Performance
How it is worked out

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

Balance 464: published upwind sail area

Seawind 1370: mainsail + jib, added up

Displacement / length

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

UltralightLightModerateHeavyVery heavy100180270350Balance 464: 105Seawind 1370: 133
  • Balance 464105· Light
  • Seawind 1370133· 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.