Semona 30
Full keel
The Semona 30 is a 30-foot sailboat.
General
| Builder | — |
|---|---|
| Designer | — |
| Years built | — |
| Hull type | Full keel |
| Rig type | — |
| Construction | — |
| Origin | — |
Dimensions
| LOA | 29.86 ft9.10 m |
|---|---|
| LWL | 22.97 ft7.00 m |
| Beam | 9.68 ft2.95 m |
| Draft (max) | 4.27 ft1.30 m |
| Displacement | 7,055 lb3,200 kg |
| Ballast | 3,307 lb1,500 kg |
| Sail Area | 344 ft²32.0 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 14.96 Under-canvassed — heavy-air / motorsailing
Ballast / Displacement 46.9 % Higher = stiffer / more sail-carrying power
Displacement / Length 260 Moderate
Comfort Ratio 21.2 Coastal cruiser
Capsize Screening 2.02 Better suited to coastal use (> 2.0)
Hull Speed 6.4 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.
Average used price
€3,900 typical asking price, used market
Average second-hand price reported by goodboats.ru. Actual prices vary with condition, equipment and location.
Data sources: goodboats.ru
