Cumulus 28
Albin Marine · designed by Peter Norlin · 1978
fin keelBermuda rigSweden
The Cumulus 28 is a 28-foot bermuda rig sailboat designed by Peter Norlin and built by Albin Marine, first launched in 1978.
General
| Builder | Albin Marine |
|---|---|
| Designer | Peter Norlin |
| Years built | 1978 |
| Hull type | fin keel |
| Rig type | Bermuda rig |
| Construction | fiberglass |
| Origin | Sweden |
Dimensions
| LOA | 28.08 ft8.56 m |
|---|---|
| LWL | 22.33 ft6.81 m |
| Beam | 9.25 ft2.82 m |
| Draft (max) | 5.25 ft1.60 m |
| Displacement | 7,055 lb3,200 kg |
| Ballast | 2,812 lb1,276 kg |
| Sail Area | 363 ft²33.7 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 15.79 Under-canvassed — heavy-air / motorsailing
Ballast / Displacement 39.9 % Higher = stiffer / more sail-carrying power
Displacement / Length 283 Moderate
Comfort Ratio 23.4 Coastal cruiser
Capsize Screening 1.93 Suited to offshore passages (≤ 2.0)
Hull Speed 6.3 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
$22,000 typical range $17,500 – $26,500
⚠ 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.
