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Seidelmann 34
Designer: Bob Seidelmann  ·  Builder: Seidelmann Yachts  ·  First built: 1981
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About the Seidelmann 34

A capable and well-regarded American production sailboat, the Seidelmann 34 earned a loyal following among coastal and bluewater cruisers during its production years. Designed by Bob Seidelmann, whose firm produced a range of fiberglass sailboats throughout the 1970s and 1980s, the 34 reflects the practical, performance-oriented sensibility that defined that era of American sailboat building. Known for solid construction and a comfortable below-decks layout, the Seidelmann 34 appeals to sailors looking for a versatile passage-maker that can handle coastal daysailing as comfortably as it can tackle longer offshore passages. The hull design balances stability with reasonable performance under sail, making it approachable for both experienced sailors and those stepping up to a larger cruising platform. Like many boats from this period, the Seidelmann 34 benefits from a devoted owner community, which helps sustain parts availability and collective knowledge — an important consideration for buyers evaluating older fiberglass production boats. For those researching an affordable, seaworthy cruiser with a proven track record, the Seidelmann 34 is well worth a closer look.

Core Dimensions
LOA (Length Overall) 34.00 ft / 10.36 m
LWL (Waterline Length) 26.50 ft / 8.08 m
Beam 11.82 ft / 3.60 m
Max Draft 5.42 ft / 1.65 m
Displacement 11,000.00 lb / 4,990 kg
Ballast 5,000.00 lb / 2,268 kg
Sail Area (Reported) 517.00 ft² / 48.03 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Bob Seidelmann
Builder Seidelmann Yachts
First Built 1981
Owner Reviews

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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
 158
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
 16.78
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
 22.04
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
 2.13
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. 6.9
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 2.03
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. 1.0
Rig Dimensions
I (Foretriangle Height) 43.0
J (Foretriangle Base) 14.5
P (Mainsail Luff) 37.25
E (Mainsail Foot) 11.0
SA Fore 311.75
SA Main 204.88
Find a Seidelmann 34 For Sale
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