Najad 331 anno 2002.

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Hull

Both the hull and the deck is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Interior

The boat is equipped with toilet facility and 40.0 liter waste water capacity.

Rig

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 Najad 331 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a long keel.

The boat can enter most marinas as the draft is just about 1.70 - 1.80 meter (5.58 - 5.88 ft) dependent on the load. See immersion rate below.

Engine

Najad 331 is typically equipped with an inboard Volvo Penta MD2030 diesel engine at 28.0 hp (20 kW), which gives a max speed about 5.9 knots.

The transmission is a saildrive.

The fuel tank has a capacity of 92.0 liters (24 US gallons, 20 imperial gallons).

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 Najad 331 is 1.89, 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 6.9 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 Najad 331 is about 177 kg/cm, alternatively 995 lbs/inch.

Meaning: if you load 177 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 995 lbs cargo on the boat it will sink 1 inch.

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 Najad 331 is 26.8.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Najad 331 is 3.06.

Ballast Ratio

The ballast ratio for Najad 331 is 40%.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Najad 331 is 273 which categorizes this boat among 'light crusers & offshore racers'.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Najad 331 is 82

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 30m^{2} (322 ft^{2}).

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

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.

Usage | Length | Diameter | ||

Jib sheet | 10.0 m | (32.7 feet) | 12 mm | (1/2 inch) |

Genoa sheet | 10.0 m | (32.7 feet) | 12 mm | (1/2 inch) |

Mainsheet | 25.0 m | (81.9 feet) | 12 mm | (1/2 inch) |

Spinnaker sheet | 22.0 m | (72.0 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 Najad 331 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