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Review of Boström 37


Boström 37
Boström 37 anno 1982.


Basic specs.

sail specifications
The Boström 37 aka B-37 is a sailboat designed by the Swedish maritime architect Bruno Boström in the late seventies. Several hundred boats have been produced. The Boström 37 is built by the Swedish yard Porali Marin.

Looking for a new boat? Find a Boström 37 or similar boat for sale

Interior
The boat is equipped with 9 berths, a galley and toilet facility.

Rig
Rig
Rig of Boström 37 anno 1983. Photo from July 2022, Jomfruland, Norway.
The boat equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

Keel

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can only enter major marinas as the draft is about 1.95 - 2.05 meter (6.40 - 6.70 ft) dependent on the load. See immersion rate below.


Engine

Boström 37 is typically equipped with an inboard Volvo Penta diesel engine at 45.0 hp (33 kW), which gives a max speed about 6.8 knots.


Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Boström 37 is 1.99, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.


Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.7 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.


Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Boström 37 is about 264 kg/cm, alternatively 1481 lbs/inch.
Meaning: if you load 264 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1481 lbs cargo on the boat it will sink 1 inch.


Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Boström 37 is 26.5.

Low High 50% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 50% of all similar sailboat designs. This is an average comfort value!


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Boström 37 is 2.74.

Slim Wide 92% 0 50 100
Compared with other similar sailboats it is more spacy than 92% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Boström 37 is 40%.

Low High 50% 0 50 100
This ballast ratio shows a righting moment that is higher than 50% of all similar sailboat designs. This righting moment (ability to resist heeling) is spot on average!


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Boström 37 is 222 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 66% 0 50 100
66% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.


SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Boström 37 with ISO 8666 reference sail is 15.9, with a 135% genua the SA/D is 19.2.

Low High 38% 0 50 100
The SA/D ratio indicates that it is faster than 38% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 34% 0 50 100
The Boström 37 has more rig than 34% of all similar sailboats, which indicates that the boat is slightly underrigged.


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Boström 37 is 46

Slow Fast 46% 0 50 100
The relative speed performance is 46 which means that a it is faster than 46% of all similar sailboat designs.


Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 44m2 (473 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.


Rig

Dimensions of sail for masthead rig.

mainsail specifications headsail specifications genoa specifications spinnaker specifications

Are your sails worn out? You might find your next sail here: Sails for Sale



If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.



Guiding dimensions of running rig
UsageLengthDiameter
Mainsail halyard 37.3 m(122.4 feet)12 mm(1/2 inch)
Jib/genoa halyard37.3 m(122.4 feet)12 mm(1/2 inch)
Spinnaker halyard37.3 m(122.4 feet)12 mm(1/2 inch)
Jib sheet 10.8 m(35.5 feet)14 mm(0.55 inch)
Genoa sheet10.8 m(35.5 feet)14 mm(0.55 inch)
Mainsheet 27.1 m(88.7 feet)14 mm(0.55 inch)
Spinnaker sheet23.8 m(78.1 feet)14 mm(0.55 inch)
Cunningham3.5 m(11.5 feet)12 mm(1/2 inch)
Kickingstrap7.0 m(23.0 feet)12 mm(1/2 inch)
Clew-outhaul7.0 m(23.0 feet)12 mm(1/2 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.



Finally

We are always looking for new photos. If you can contribute with photos for Bostrom 37 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.



References