Islander 40
Islander Yachts · designed by Doug Peterson · 1979
fin keelBermuda rigUnited States
The Islander 40 is a 40-foot bermuda rig sailboat designed by Doug Peterson and built by Islander Yachts, first launched in 1979.
General
| Builder | Islander Yachts |
|---|---|
| Designer | Doug Peterson |
| Years built | 1979 |
| Hull type | fin keel |
| Rig type | Bermuda rig |
| Construction | fiberglass |
| Origin | United States |
Dimensions
| LOA | 39.54 ft12.05 m |
|---|---|
| LWL | 30.83 ft9.40 m |
| Beam | 11.83 ft3.61 m |
| Draft (max) | 7.17 ft2.19 m |
| Displacement | 17,000 lb7,711 kg |
| Ballast | 7,700 lb3,493 kg |
| Sail Area | 734 ft²68.2 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 17.76 Cruiser — good all-round performance
Ballast / Displacement 45.3 % Higher = stiffer / more sail-carrying power
Displacement / Length 259 Moderate
Comfort Ratio 29.3 Coastal cruiser
Capsize Screening 1.84 Suited to offshore passages (≤ 2.0)
Hull Speed 7.4 kn Theoretical max displacement speed
How these numbers are calculated
- SA / Displacement
SA ÷ (Disp ÷ 64)^(2/3)— Power-to-weight. < 16 under-canvassed, 16–20 cruiser, > 20 racer.- Ballast / Displacement
Ballast ÷ Disp × 100— Stability/stiffness. Higher carries sail better.- Displacement / Length
Disp(lt) ÷ (0.01 · LWL)³— < 100 ultralight, 100–200 light, 200–300 moderate, > 300 heavy.- Comfort Ratio (Brewer)
Disp ÷ (0.65 · (0.7·LWL + 0.3·LOA) · Beam^1.33)— Motion in a seaway. Higher = more comfortable offshore.- Capsize Screening
Beam ÷ (Disp ÷ 64)^(1/3)— ≤ 2.0 favored for offshore; > 2.0 better for coastal use.- Hull Speed
1.34 · √LWL— Theoretical max displacement speed in knots.
Estimated price
$43,500 typical range $35,000 – $52,000
⚠ Rough estimate only — not market data. Derived from a simple model based on length and hull age; actual asking prices vary widely with condition, equipment, engine hours and location.