Irwin 27
Irwin Yachts · designed by Ted Irwin · 1967
keel and centerboardBermuda rigUnited States
The Irwin 27 is a 27-foot bermuda rig sailboat designed by Ted Irwin and built by Irwin Yachts, first launched in 1967.
General
| Builder | Irwin Yachts |
|---|---|
| Designer | Ted Irwin |
| Years built | 1967 |
| Hull type | keel and centerboard |
| Rig type | Bermuda rig |
| Construction | fiberglass |
| Origin | United States |
Dimensions
| LOA | 27.08 ft8.25 m |
|---|---|
| LWL | 20.50 ft6.25 m |
| Beam | 8.67 ft2.64 m |
| Draft (max) | 7.83 ft2.39 m |
| Displacement | 6,600 lb2,994 kg |
| Ballast | —— |
| Sail Area | 372 ft²34.6 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 16.92 Cruiser — good all-round performance
Displacement / Length 342 Heavy — bluewater displacement
Comfort Ratio 25.5 Coastal cruiser
Capsize Screening 1.85 Suited to offshore passages (≤ 2.0)
Hull Speed 6.1 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
$19,000 typical range $15,000 – $23,000
⚠ 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.
