Amphibi-Con 25
Mount Desert Yachts · designed by E. Farnham Butler · 1954
modified long keel and centerboardBermuda rigUnited States
The Amphibi-Con 25 is a 25-foot bermuda rig sailboat designed by E. Farnham Butler and built by Mount Desert Yachts, first launched in 1954.
General
| Builder | Mount Desert Yachts |
|---|---|
| Designer | E. Farnham Butler |
| Years built | 1954 |
| Hull type | modified long keel and centerboard |
| Rig type | Bermuda rig |
| Construction | fiberglass |
| Origin | United States |
Dimensions
| LOA | 25.42 ft7.75 m |
|---|---|
| LWL | 21.67 ft6.61 m |
| Beam | 7.75 ft2.36 m |
| Draft (max) | 4.25 ft1.30 m |
| Displacement | 3,500 lb1,588 kg |
| Ballast | 1,100 lb499 kg |
| Sail Area | 277 ft²25.7 m² |
Design ratios
Computed from the specs above using the standard formulas. Try the sailboat calculators with your own numbers.
SA / Displacement 19.23 Cruiser — good all-round performance
Ballast / Displacement 31.4 % Higher = stiffer / more sail-carrying power
Displacement / Length 154 Light
Comfort Ratio 15.5 Racing / light coastal
Capsize Screening 2.04 Better suited to coastal use (> 2.0)
Hull Speed 6.2 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
$16,000 typical range $13,000 – $19,000
⚠ 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.
