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Alpha 48
 ·  Builder: Adriatic Yachts (Usa)  ·  First built: 1980
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About the Alpha 48

Built by Adriatic Yachts starting in 1980, this substantial 48-footer represents a thoughtful approach to blue-water cruising design. The masthead ketch rig configuration offers excellent sail handling flexibility for shorthanded crews, while the fiberglass construction with foam-cored deck provides both strength and weight savings where it matters most. With a displacement of 43,000 pounds and 12,000 pounds of ballast, the Alpha 48 delivers the stability and seaworthiness that serious cruisers demand for extended offshore passages. The generous 13.58-foot beam creates spacious accommodations below, while the 6.33-foot draft with keel/centerboard configuration allows access to shallow anchorages without sacrificing windward performance. The boat's impressive comfort ratio of 51.11 indicates exceptional motion comfort in seaway conditions, making long passages more pleasant for the crew. Combined with a conservative capsize screening value of 1.55, these numbers suggest a yacht well-suited for ocean voyaging. The 1,200 square feet of sail area provides adequate power for the displacement, though this is clearly a boat designed for comfort and safety rather than racing performance. The reliable 85-horsepower engine ensures dependable auxiliary power for maneuvering in tight quarters or powering through calms.

Core Dimensions
LOA (Length Overall) 48.00 ft / 14.63 m
LWL (Waterline Length) 37.00 ft / 11.28 m
Beam 13.58 ft / 4.14 m
Max Draft 6.33 ft / 1.93 m
Min Draft 4.25 ft / 1.30 m
Displacement 43,000.00 lb / 19,504 kg
Ballast 12,000.00 lb / 5,443 kg
Sail Area (Reported) 1,200.00 ft² / 111.48 m²
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Masthead Ketch
Construction FG w/foam cored deck
Builder Adriatic Yachts (USA)
First Built 1980
Owner Reviews

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
15.71
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
27.91
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
378.98
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
51.11
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
1.55
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 8.15 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 1,795.34 pounds/inch
Engine & Accommodations
Engine Make Perkins
Engine Type Diesel
Horsepower 85
Fuel Capacity 200 gals / 757 L
Water Capacity 200 gals / 757 L
How It Compares

vs. Explorer 46 Morgan, Fuji 45, Hughes 48, Seafarer 48, Seahawk 48

This boat Similar boats
Dimensions
LOA
Alpha 48 ★
48.0 ft
Explorer 46 Morgan
46.0 ft
Fuji 45
45.0 ft
Hughes 48
48.0 ft
Seafarer 48
48.0 ft
Seahawk 48
48.0 ft
LWL
Alpha 48 ★
37.0 ft
Explorer 46 Morgan
32.5 ft
Fuji 45
33.0 ft
Hughes 48
33.0 ft
Seafarer 48
33.0 ft
Seahawk 48
39.0 ft
Beam
Alpha 48 ★
13.6 ft
Explorer 46 Morgan
11.0 ft
Fuji 45
12.7 ft
Hughes 48
11.8 ft
Seafarer 48
11.8 ft
Seahawk 48
13.8 ft
Displacement
Alpha 48 ★
43 lbs
Explorer 46 Morgan
29 lbs
Fuji 45
30 lbs
Hughes 48
30 lbs
Seafarer 48
30 lbs
Seahawk 48
52 lbs
Ballast
Alpha 48 ★
12 lbs
Explorer 46 Morgan
12 lbs
Fuji 45
8 lbs
Hughes 48
15 lbs
Seafarer 48
15 lbs
Seahawk 48
10 lbs
Sail Area
Alpha 48 ★
1 sq ft
Explorer 46 Morgan
795 sq ft
Fuji 45
Hughes 48
Seafarer 48
1 sq ft
Seahawk 48
Performance
PHRF Rating (lower = faster)
Alpha 48 ★
Explorer 46 Morgan
Fuji 45
120 s/nm
Hughes 48
113 s/nm
Seafarer 48
Seahawk 48
SA / Displacement (higher = more powerful)
Alpha 48 ★
15.7
Explorer 46 Morgan
13.4
Fuji 45
Hughes 48
Seafarer 48
17.4
Seahawk 48
Ballast / Disp (higher = stiffer)
Alpha 48 ★
27.9 %
Explorer 46 Morgan
40.7 %
Fuji 45
28.7 %
Hughes 48
52.3 %
Seafarer 48
52.3 %
Seahawk 48
19.2 %
Comfort Ratio (higher = more comfortable offshore)
Alpha 48 ★
51.1
Explorer 46 Morgan
51.2
Fuji 45
Hughes 48
Seafarer 48
46.0
Seahawk 48
58.8
Capsize Screening (lower = safer)
Alpha 48 ★
1.55
Explorer 46 Morgan
1.43
Fuji 45
Hughes 48
Seafarer 48
1.53
Seahawk 48
1.48
Displacement / Length (lower = lighter)
Alpha 48 ★
378
Explorer 46 Morgan
383
Fuji 45
378
Hughes 48
372
Seafarer 48
372
Seahawk 48
391
Hull Speed
Alpha 48 ★
8.2 kts
Explorer 46 Morgan
7.6 kts
Fuji 45
Hughes 48
Seafarer 48
7.7 kts
Seahawk 48
8.4 kts
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