IW-31

Main

Appendages
Fin with rudder on skeg
Construction
FG
First built hull
1968
Hull type
Monohull
Last built hull
1985
Model
MD18
Sailboat builder
IW-Varvet
Sailboat designer
Sparkman & Stephens

Dimensions

Ballast Type
Iron
Ballast weight
1542.0
Beam
2.69
Displacement
3538.0
Draft
1.65
Max Draft
1.65
Overall length
9.24
Waterline length
6.71

Sails

E
2.85
Est. Forestay Length
11.73
Fore area
19.49
I
11.2
J
3.48
Mainsail area
13.68
P
9.6
Total area
33.17

Engine

Engine(s) power
10.0
Engines amount
1
Fuel type
Diesel
Make
Volvo Penta

Performance

Ballast ratio
43.59
Capsize Screening Formula
1.78
Comfort Ratio
27.03
Critical hull speed
6.29
Displacement-length ratio (DLR)
327.02
Upwind sail area to displacement
14.57

Accomodation

The IW-31 is a sailing boat designed and built by the Danish shipyard, IW Yachts. It is a popular cruising yacht known for its performance, comfort, and seaworthiness. Here are some key features and characteristics of the IW-31:

1. Design: The IW-31 was designed by the renowned Danish naval architect, E.G. van de Stadt. It features a sleek and timeless design with a moderate displacement hull, a fin keel, and a balanced rudder.

2. Construction: The boat is constructed using high-quality materials, including a solid fiberglass hull and a deck made of sandwich construction with a balsa core. This construction method ensures strength, durability, and good insulation.

3. Dimensions: The IW-31 has an overall length of approximately 9.45 meters (31 feet) and a beam of around 2.95 meters (9.7 feet). It has a draft of about 1.6 meters (5.2 feet), which allows for good stability and sailing performance.

4. Sailing Performance: The IW-31 is known for its excellent sailing performance, both in light winds and heavy weather conditions. It has a well-balanced sail plan with a large mainsail and a genoa, providing good speed and maneuverability.

5. Interior Layout: The interior of the IW-31 is designed to maximize comfort and functionality. It typically features a spacious saloon with a dining area, a well-equipped galley, a navigation station, and a separate head compartment. There are also two or three cabins, providing accommodation for up to six people.

6. Comfort and Amenities: Despite its compact size, the IW-31 offers a comfortable living space. It has ample storage compartments, good headroom, and large windows that provide plenty of natural light. Some models may also have additional amenities such as a heating system, a hot water system, and a shower.

7. Seaworthiness: The IW-31 is designed to handle various sea conditions and is considered seaworthy for coastal and offshore cruising. Its sturdy construction, combined with a well-balanced hull and rig, ensures stability and safety at sea.

8. Popularity: The IW-31 has gained popularity among sailors who appreciate its combination of performance, comfort, and quality construction. It is often praised for its ease of handling, making it suitable for both experienced sailors and those new to sailing.

Overall, the IW-31 is a well-regarded sailing boat that offers a balance of performance, comfort, and seaworthiness. It is a popular choice for cruising enthusiasts looking for a reliable and enjoyable sailing experience.

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