Review of MRCB 37

Basic specs.

sail specifications
The MRCB 37 is a sailboat designed by the British maritime architect Ian L. Anderson in the early eighties.

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The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

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 MRCB 37 is 2.16, indicating that this boat would not 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 7.5 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 MRCB 37 is about 233 kg/cm, alternatively 1308 lbs/inch.
Meaning: if you load 233 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1308 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 MRCB 37 is 18.7.

Low High 10% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 10% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for MRCB 37 is 3.08.

Slim Wide 66% 0 50 100
Compared with other similar sailboats it is more spacy than 66% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for MRCB 37 is 161 which categorizes this boat among 'light racers'.

Heavy Light 86% 0 50 100
86% 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 MRCB 37 with ISO 8666 reference sail is 13.0, with a 135% genua the SA/D is 15.3.

Low High 12% 0 50 100
The SA/D ratio indicates that it is faster than 12% of all similar sailboat designs in light wind.



Dimensions of sail for fractional rig.

mainsail specifications headsail 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
Mainsail halyard 28.0 m(91.8 feet)12 mm(1/2 inch)
Jib/genoa halyard28.0 m(91.8 feet)12 mm(1/2 inch)
Spinnaker halyard28.0 m(91.8 feet)12 mm(1/2 inch)
Jib sheet 11.3 m(37.0 feet)14 mm(0.55 inch)
Genoa sheet11.3 m(37.0 feet)14 mm(0.55 inch)
Mainsheet 28.2 m(92.5 feet)14 mm(0.55 inch)
Spinnaker sheet24.8 m(81.4 feet)14 mm(0.55 inch)
Cunningham3.6 m(11.7 feet)12 mm(1/2 inch)
Kickingstrap7.1 m(23.4 feet)12 mm(1/2 inch)
Clew-outhaul7.1 m(23.4 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.

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