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Hb 31
Designer: Van De Stadt  ·  Builder: Hunter Boats  ·  First built: 1983
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About the Hb 31

Finding comprehensive information about the Hb 31 proves challenging, as this sailboat appears to be a lesser-documented design with limited specifications readily available. Despite the scarcity of detailed technical data, this 31-foot sailboat likely represents a mid-sized cruising design from an era when many manufacturers were exploring various approaches to coastal and near-shore sailing. Based on its size classification, the Hb 31 would typically appeal to sailors seeking a boat capable of comfortable weekend cruising and coastal exploration. Thirty-one-foot sailboats generally offer a practical balance between manageable size for smaller crews and adequate interior space for extended outings. This length category often features boats designed for versatility, handling both day sailing adventures and multi-day coastal passages with reasonable comfort. Without extensive documentation available, the Hb 31 remains somewhat enigmatic in sailing circles. Prospective buyers researching this model would benefit from seeking out existing owners or sailing forums where first-hand experiences might provide insights into the boat's sailing characteristics, build quality, and overall performance. The limited available information suggests this boat may represent a more specialized or regional design rather than a widely produced mainstream model.

Core Dimensions
LOA (Length Overall) 30.50 ft / 9.30 m
LWL (Waterline Length) 23.60 ft / 7.19 m
Beam 10.50 ft / 3.20 m
Max Draft 5.60 ft / 1.71 m
Displacement 5,500.00 lb / 2,495 kg
Ballast 2,645.00 lb / 1,200 kg
Sail Area (Reported) 370.00 ft² / 34.37 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Van de Stadt
Builder Hunter Boats
First Built 1983
Last Built 1985
Owner Reviews

No owner reviews yet — be the first to share your experience with this boat.

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
19.06
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
14.45
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
2.38
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. 6.51
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
3.11
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. 885.42
Rig Dimensions
I (Foretriangle Height) 33.3
J (Foretriangle Base) 6.5
P (Mainsail Luff) 37.1
E (Mainsail Foot) 14.1
SA Fore 108.23
SA Main 261.56
How It Compares

vs. Attalia 32 Jeanneau, First 305 Beneteau, Tanzer 31

This boat Similar boats
Dimensions
LOA
Hb 31 ★
30.5 ft
Attalia 32 Jeanneau
30.5 ft
First 305 Beneteau
30.5 ft
Tanzer 31
30.6 ft
LWL
Hb 31 ★
23.6 ft
Attalia 32 Jeanneau
25.9 ft
First 305 Beneteau
26.8 ft
Tanzer 31
25.0 ft
Beam
Hb 31 ★
10.5 ft
Attalia 32 Jeanneau
10.8 ft
First 305 Beneteau
10.5 ft
Tanzer 31
10.5 ft
Displacement
Hb 31 ★
5 lbs
Attalia 32 Jeanneau
7 lbs
First 305 Beneteau
8 lbs
Tanzer 31
8 lbs
Ballast
Hb 31 ★
2 lbs
Attalia 32 Jeanneau
2 lbs
First 305 Beneteau
2 lbs
Tanzer 31
3 lbs
Sail Area
Hb 31 ★
370 sq ft
Attalia 32 Jeanneau
410 sq ft
First 305 Beneteau
Tanzer 31
468 sq ft
Performance
SA / Displacement (higher = more powerful)
Hb 31 ★
19.1
Attalia 32 Jeanneau
17.2
First 305 Beneteau
Tanzer 31
18.3
Ballast / Disp (higher = stiffer)
Hb 31 ★
Attalia 32 Jeanneau
39.0 %
First 305 Beneteau
36.1 %
Tanzer 31
39.8 %
Comfort Ratio (higher = more comfortable offshore)
Hb 31 ★
14.5
Attalia 32 Jeanneau
17.8
First 305 Beneteau
Tanzer 31
21.0
Capsize Screening (lower = safer)
Hb 31 ★
2.38
Attalia 32 Jeanneau
2.22
First 305 Beneteau
Tanzer 31
2.08
Displacement / Length (lower = lighter)
Hb 31 ★
Attalia 32 Jeanneau
192
First 305 Beneteau
192
Tanzer 31
237
Hull Speed
Hb 31 ★
6.5 kts
Attalia 32 Jeanneau
6.8 kts
First 305 Beneteau
Tanzer 31
6.7 kts
Speed Number (higher = faster)
Hb 31 ★
3.1
Attalia 32 Jeanneau
2.8
First 305 Beneteau
Tanzer 31
2.4
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