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Iw 40
Designer: Sparkman & Stephens  ·  Builder: Iw-Varvet  ·  First built: 1975
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About the Iw 40

Information about the Iw 40 sailboat remains surprisingly scarce in readily available marine databases, making this vessel something of an enigma in the sailing world. With limited specifications to work from, potential buyers should approach this model with thorough independent research and professional marine surveys. What can be inferred from the designation suggests a 40-foot sailing yacht, placing it in the mid-size cruising category that typically appeals to sailors seeking a balance between manageable handling and comfortable accommodation. Boats of this length generally offer sufficient space for extended coastal cruising and potentially short offshore passages, depending on their construction and design philosophy. The scarcity of readily available technical data could indicate either a limited production run, regional distribution, or perhaps a lesser-known manufacturer. This uncertainty makes the Iw 40 a boat that would require particularly careful evaluation by prospective buyers. Those considering this vessel should prioritize obtaining comprehensive documentation, including original specifications, maintenance records, and ideally connecting with other owners who can provide real-world insights into the boat's sailing characteristics, build quality, and overall suitability for intended use.

Core Dimensions
LOA (Length Overall) 39.70 ft / 12.10 m
LWL (Waterline Length) 30.02 ft / 9.15 m
Beam 11.48 ft / 3.50 m
Max Draft 6.89 ft / 2.10 m
Displacement 19,841.00 lb / 9,000 kg
Ballast 8,929.00 lb / 4,050 kg
Sail Area (Reported) 715.00 ft² / 66.43 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Sparkman & Stephens
Builder IW-Varvet
First Built 1975
Owner Reviews

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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
15.67
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
36.09
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
1.7
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. 7.34
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
1.46
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) 51.0
J (Foretriangle Base) 17.0
P (Mainsail Luff) 45.0
E (Mainsail Foot) 12.5
SA Fore 433.5
SA Main 281.25
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