B-31

Main

Appendages
Fin with rudder on skeg
Construction
FG
First built hull
1973
Hull type
Monohull
Last built hull
1988
Model
B-31 (BOSTROM)
Sailboat designer
Bruno Boström/Grandinsson

Dimensions

Ballast Type
Iron
Ballast weight
1700.0
Beam
2.76
Displacement
3530.0
Draft
1.8
Max Draft
1.8
Overall length
9.34
Waterline length
7.92

Sails

E
2.8
Est. Forestay Length
11.97
Fore area
20.81
I
11.4
J
3.65
Mainsail area
13.58
P
9.7
Total area
34.37

Engine

Engine(s) power
8.0
Engines amount
1
Fuel type
Diesel
Make
Yanmar

Performance

Ballast ratio
48.16
Capsize Screening Formula
1.83
Comfort Ratio
23.32
Critical hull speed
6.83
Displacement-length ratio (DLR)
198.12
Upwind sail area to displacement
15.12

Accomodation

The B-31, also known as the Bostrom, is a sailing boat designed by Lars-Olof Norlin and built by Bostrom Boats in Sweden. It is a popular model among sailors due to its performance, versatility, and comfortable cruising capabilities. Here are some key features and characteristics of the B-31:

1. Design: The B-31 features a sleek and modern design with a moderate displacement hull. It has a fin keel and a spade rudder, which contribute to its excellent sailing performance and maneuverability.

2. Size: The B-31 has an overall length of approximately 31 feet (9.45 meters) and a beam of around 10 feet (3.05 meters). It has a moderate draft, typically ranging from 5 to 6 feet (1.52 to 1.83 meters), depending on the specific model and configuration.

3. Construction: The boat is constructed using high-quality materials, including a solid fiberglass hull and a balsa-cored deck. This construction method provides strength, durability, and insulation.

4. Sailing Performance: The B-31 is known for its impressive sailing performance. It has a well-balanced sail plan, allowing for easy handling and responsiveness. The boat is often praised for its upwind capabilities and ability to maintain good speed in various wind conditions.

5. Interior Layout: The B-31 offers a comfortable and functional interior layout. It typically features a spacious saloon with a dining area, a well-equipped galley, a navigation station, and a head compartment. There are usually two private cabins, providing accommodation for up to six people.

6. Comfort and Amenities: Despite its relatively compact size, the B-31 offers a range of amenities to ensure a comfortable cruising experience. These may include ample storage space, a well-designed galley with a stove and refrigerator, a hot water system, and a heating system for colder climates.

7. Deck Layout: The deck layout of the B-31 is designed with ergonomics and ease of use in mind. It features wide side decks, allowing for safe movement around the boat. The cockpit is spacious and well-protected, providing a comfortable seating area for the crew.

8. Versatility: The B-31 is a versatile boat suitable for various sailing purposes. It can be used for day sailing, coastal cruising, and even offshore passages. Its design and construction make it capable of handling a wide range of weather conditions.

Overall, the B-31 (Bostrom) sailing boat is a well-regarded vessel known for its performance, comfort, and versatility. It offers a balance between speed and comfort, making it a popular choice among sailors looking for a reliable and enjoyable sailing experience.

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