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Seidelmann 299
Designer: Bob Seidelmann  ·  Builder: Seidelmann Yachts (Usa)  ·  First built: 1979
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About the Seidelmann 299

Built between 1979 and 1981, this Bob Seidelmann-designed 30-footer represents a thoughtful approach to coastal cruising and club racing from the late 1970s era. The 299's moderate proportions and fin keel configuration with spade rudder deliver responsive handling while maintaining the stability needed for comfortable cruising. With a displacement of 8,000 pounds and 3,600 pounds of ballast, the 299 strikes a reasonable balance between performance and seaworthiness. The masthead sloop rig carries 429 square feet of sail area, providing adequate power for both light air sailing and spirited performance in moderate conditions. Her SA/Displacement ratio of 17.22 indicates moderate sailing characteristics that won't overwhelm novice sailors while still offering engaging performance for experienced crews. The comfort ratio of 19.67 suggests this boat leans toward the performance end of the spectrum rather than heavy cruising, making her well-suited for weekend coastal adventures, day sailing, and club racing. Her capsize screening formula of 2.2 indicates good stability for nearshore and coastal sailing, though she's not intended for extended offshore passages. Seidelmann Yachts built these fiberglass boats during a brief but focused production run, creating a relatively rare but well-regarded design among enthusiasts of 1970s sailing craft.

Core Dimensions
LOA (Length Overall) 29.92 ft / 9.12 m
LWL (Waterline Length) 24.00 ft / 7.32 m
Beam 11.00 ft / 3.35 m
Max Draft 5.42 ft / 1.65 m
Displacement 8,000.00 lb / 3,629 kg
Ballast 3,600.00 lb / 1,633 kg
Sail Area (Reported) 429.00 ft² / 39.86 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Bob Seidelmann
Builder Seidelmann Yachts (USA)
First Built 1979
Last 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
 180
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
 17.22
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
 45
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
 258.35
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
 19.67
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
 2.2
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. 6.56 kn
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
 2.12
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. 943.30 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 17.22
Rig Dimensions
I (Foretriangle Height) 38.50 ft / 11.73 m
J (Foretriangle Base) 12.00 ft / 3.66 m
P (Mainsail Luff) 33.00 ft / 10.06 m
E (Mainsail Foot) 12.00 ft / 3.66 m
SA Fore 231.00 ft² / 21.46 m²
SA Main 198.00 ft² / 18.39 m²
SA Total (100%) 429.00 ft² / 39.86 m²
Est. Forestay Length 40.33 ft / 12.29 m
Engine & Accommodations
Engine Make Yanmar
Engine Type Diesel
Fuel Capacity 12 gals / 45 L
Water Capacity 30 gals / 114 L
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