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Seidelmann 30
Designer: Bob Seidelmann  ·  Builder: Dickerson/Seidelmann  ·  First built: 1977
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About the Seidelmann 30

Produced by Seidelmann Yachts, a builder known for crafting capable and approachable fiberglass sailboats throughout the latter half of the twentieth century, the Seidelmann 30 represents a solid choice for sailors seeking a well-rounded coastal cruiser. Designed with accessibility in mind, this boat appeals to both intermediate sailors looking to step up from smaller vessels and experienced cruisers who value a manageable, practical platform. The Seidelmann 30 carries the hallmarks typical of its era, emphasizing comfortable handling and dependable performance over outright racing ambition. Its proportions suggest a boat well-suited to day sailing, weekend getaways, and coastal passages where ease of handling and cabin comfort share equal priority. Like other Seidelmann designs, it was built to offer genuine value without sacrificing seaworthiness. While detailed specifications remain limited, the Seidelmann 30 has maintained a quiet but loyal following among sailors who appreciate its unpretentious character. For those researching an affordable, capable coastal cruiser with a reputable heritage, the Seidelmann 30 deserves a closer look and, ideally, a thorough in-person inspection before making a final decision.

Core Dimensions
LOA (Length Overall) 29.83 ft / 9.09 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 12.00 ft / 3.66 m
Max Draft 6.83 ft / 2.08 m
Displacement 9,400.00 lb / 4,264 kg
Ballast 4,500.00 lb / 2,041 kg
Design & Construction
Hull Type Centerboard (Trunk)
Rigging Type Masthead Sloop
Construction FG
Designer Bob Seidelmann
Builder Dickerson/Seidelmann
First Built 1977
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
162
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
47.87
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
268.57
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. 6.43 pounds/inch
Rig Dimensions
I (Foretriangle Height) 3.50 ft / 1.07 m
J (Foretriangle Base) 13.50 ft / 4.11 m
P (Mainsail Luff) 470.00 ft² / 43.66 m²
E (Mainsail Foot) 268.57
How It Compares

vs. Morgan Out Island 30, Pearson 30, San Juan 30

This boat Similar boats
Dimensions
LOA
Seidelmann 30 ★
29.8 ft
Morgan Out Island 30
29.8 ft
Pearson 30
29.8 ft
San Juan 30
29.9 ft
LWL
Seidelmann 30 ★
25.0 ft
Morgan Out Island 30
24.8 ft
Pearson 30
25.0 ft
San Juan 30
23.7 ft
Beam
Seidelmann 30 ★
12.0 ft
Morgan Out Island 30
9.2 ft
Pearson 30
9.5 ft
San Juan 30
10.1 ft
Displacement
Seidelmann 30 ★
9 lbs
Morgan Out Island 30
9 lbs
Pearson 30
8 lbs
San Juan 30
7 lbs
Ballast
Seidelmann 30 ★
4 lbs
Morgan Out Island 30
3 lbs
Pearson 30
3 lbs
San Juan 30
3 lbs
Sail Area
Seidelmann 30 ★
Morgan Out Island 30
375 sq ft
Pearson 30
445 sq ft
San Juan 30
402 sq ft
Performance
PHRF Rating (lower = faster)
Seidelmann 30 ★
162 s/nm
Morgan Out Island 30
Pearson 30
174 s/nm
San Juan 30
168 s/nm
SA / Displacement (higher = more powerful)
Seidelmann 30 ★
Morgan Out Island 30
13.4
Pearson 30
17.4
San Juan 30
17.3
Ballast / Disp (higher = stiffer)
Seidelmann 30 ★
47.9 %
Morgan Out Island 30
31.6 %
Pearson 30
42.8 %
San Juan 30
Comfort Ratio (higher = more comfortable offshore)
Seidelmann 30 ★
Morgan Out Island 30
29.2
Pearson 30
24.3
San Juan 30
20.2
Capsize Screening (lower = safer)
Seidelmann 30 ★
Morgan Out Island 30
1.73
Pearson 30
1.88
San Juan 30
2.09
Displacement / Length (lower = lighter)
Seidelmann 30 ★
268
Morgan Out Island 30
277
Pearson 30
237
San Juan 30
Hull Speed
Seidelmann 30 ★
Morgan Out Island 30
6.7 kts
Pearson 30
6.7 kts
San Juan 30
6.5 kts
Speed Number (higher = faster)
Seidelmann 30 ★
Morgan Out Island 30
1.6
Pearson 30
2.3
San Juan 30
2.3
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