Back to Search
Inferno 29
Designer: Håkan Södergren  ·  Builder: Naboats (Fin)  ·  First built: 1982
+ Add to Compare
About the Inferno 29

Designed by renowned Swedish naval architect Håkan Södergren and built by Finland's Naboats starting in 1982, this 29-footer represents Nordic sailing craftsmanship at its finest. The Inferno 29 strikes an appealing balance between performance and practicality, making it well-suited for spirited coastal cruising and club racing. With a length overall of 28.87 feet and a waterline length of 23.95 feet, the design showcases classic Scandinavian proportions. The fin keel and spade rudder configuration, combined with a fractional sloop rig carrying 410 square feet of sail, delivers responsive handling and good upwind performance. At 5,732 pounds displacement with 2,094 pounds of ballast, the boat offers reasonable stability while maintaining the nimble feel characteristic of European designs. The comfort ratio of 21.12 suggests this is more performance-oriented than a heavy cruiser, while the capsize screening formula of 1.84 indicates good stability for coastal waters. The SA/Displacement ratio of 20.54 confirms adequate power for light to moderate conditions. Hull speed reaches 6.56 knots, typical for this size range. Best suited for experienced sailors who appreciate responsive handling, the Inferno 29 excels in day sailing, weekend cruising, and competitive sailing in protected to semi-protected waters.

Core Dimensions
LOA (Length Overall) 28.87 ft / 8.80 m
LWL (Waterline Length) 23.95 ft / 7.30 m
Beam 8.20 ft / 2.50 m
Max Draft 4.92 ft / 1.50 m
Displacement 5,732.00 lb / 2,600 kg
Ballast 2,094.00 lb / 950 kg
Ballast Type Lead
Sail Area (Reported) 410.00 ft² / 38.09 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Håkan Södergren
Builder NaBoats (FIN)
First Built 1982
Related Sailboats ["J/29" · "Mirage 29" · "Cal 2 29" · "Tanzer 29" · "Watkins 29"]
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
 20.54
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
 36.53
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
 186.27
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
 21.12
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
 1.84
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
 3.29
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. 701.72 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. 20.52
Rig Dimensions
I (Foretriangle Height) 33.46 ft / 10.20 m
J (Foretriangle Base) 10.33 ft / 3.15 m
P (Mainsail Luff) 36.08 ft / 11.00 m
E (Mainsail Foot) 13.12 ft / 4.00 m
SA Fore 172.82 ft² / 16.06 m²
SA Main 236.68 ft² / 21.99 m²
SA Total (100%) 409.50 ft² / 38.04 m²
Est. Forestay Length 35.02 ft / 10.67 m
Engine & Accommodations
Engine Make Yanmar or BMW
Engine Type Diesel
Fuel Capacity 10 gals / 38 L
Water Capacity 17 gals / 64 L
How It Compares

vs. Cal 2 29, Mirage 29, Tanzer 29

This boat Similar boats
Dimensions
LOA
Inferno 29 ★
28.9 ft
Cal 2 29
29.0 ft
Mirage 29
29.0 ft
Tanzer 29
29.0 ft
LWL
Inferno 29 ★
24.0 ft
Cal 2 29
24.0 ft
Mirage 29
24.3 ft
Tanzer 29
24.3 ft
Beam
Inferno 29 ★
8.2 ft
Cal 2 29
9.3 ft
Mirage 29
10.5 ft
Tanzer 29
10.3 ft
Displacement
Inferno 29 ★
5 lbs
Cal 2 29
8 lbs
Mirage 29
6 lbs
Tanzer 29
6 lbs
Ballast
Inferno 29 ★
2 lbs
Cal 2 29
3 lbs
Mirage 29
2 lbs
Tanzer 29
2 lbs
Sail Area
Inferno 29 ★
410 sq ft
Cal 2 29
422 sq ft
Mirage 29
—
Tanzer 29
403 sq ft
Performance
PHRF Rating (lower = faster)
Inferno 29 ★
—
Cal 2 29
—
Mirage 29
174 s/nm
Tanzer 29
174 s/nm
SA / Displacement (higher = more powerful)
Inferno 29 ★
20.5
Cal 2 29
16.9
Mirage 29
—
Tanzer 29
18.6
Ballast / Disp (higher = stiffer)
Inferno 29 ★
36.5 %
Cal 2 29
41.9 %
Mirage 29
33.8 %
Tanzer 29
37.3 %
Comfort Ratio (higher = more comfortable offshore)
Inferno 29 ★
21.1
Cal 2 29
25.0
Mirage 29
—
Tanzer 29
17.6
Capsize Screening (lower = safer)
Inferno 29 ★
1.84
Cal 2 29
1.85
Mirage 29
—
Tanzer 29
2.20
Displacement / Length (lower = lighter)
Inferno 29 ★
186
Cal 2 29
258
Mirage 29
212
Tanzer 29
203
Hull Speed
Inferno 29 ★
6.6 kts
Cal 2 29
6.6 kts
Mirage 29
—
Tanzer 29
6.6 kts
Speed Number (higher = faster)
Inferno 29 ★
3.3
Cal 2 29
2.1
Mirage 29
—
Tanzer 29
2.8
Find a Inferno 29 For Sale
Y YachtWorld Brokerage listings S Sailboat Listings Sailboats only C Craigslist National search F Facebook Marketplace Local listings B boats.com Global marketplace