Review of Najad 360

Najad 360 anno 1990.

Basic specs.

The Najad 360 is a sailboat designed by the maritime architect Thorwald Karlsson in the mid eighties. The Najad 360 is built by the Swedish yard Najad Varvet AB.

Looking for a new boat? Find a Najad 360 or similar boat for sale

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.
The deck is a double deck which improves the indoor climate.

Interior

Interior of Najad 360 anno 1990.

The interior is like many other boats made of mahogany.
The boat is equipped with 3 cabins, 6 berths, a galley and toilet facility.

Chart table of Najad 360 anno 1990.

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

Keel of Najad 360 anno 1990.

The Najad 360 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated. As the surface of a fin type keel is just a fraction of the total wet surface, the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts.

The boat can enter most marinas as the draft is just about 1.78 - 1.88 meter (5.84 - 6.14 ft) dependent on the load. See immersion rate below.

Engine

Najad 360 is typically equipped with an inboard Volvo Penta 2003 TD Turbo diesel engine at 43.0 hp (32 kW), which gives a max speed about 6.8 knots.

The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive e.g. a sail drive.

The fuel tank which is made of stainless steel has a capacity of 250.0 liters (66 US gallons, 54 imperial gallons).

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 Najad 360 is 1.80, 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 7.4 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 360 is about 211 kg/cm, alternatively 1186 lbs/inch.
Meaning: if you load 211 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1186 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 Najad 360 is 29.7.

Comparing this ratio with similar sailboats show that it is more comfortable than 69% of all similar sailboat designs. This comfort value is just above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Najad 360 is 3.14.

Compared with other similar sailboats it is more spacy than 58% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Najad 360 is 43%.

This ballast ratio shows a righting moment that is higher than 66% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Najad 360 is 246 which categorizes this boat among 'light crusers & offshore racers'.

54% 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 Najad 360 with ISO 8666 reference sail is 15.0, with a 135% genua the SA/D is 17.7.

The SA/D ratio indicates that it is faster than 27% of all similar sailboat designs in light wind.

Over- / underrigged

The Najad 360 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 Najad 360 is 12

The relative speed performance is 12 which means that a it is faster than 12% 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 36m² (387 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.

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**
Usage	Length		Diameter
Mainsail halyard	31.6 m	(103.5 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	31.6 m	(103.5 feet)	12 mm	(1/2 inch)
Spinnaker halyard	31.6 m	(103.5 feet)	12 mm	(1/2 inch)
Jib sheet	10.7 m	(35.2 feet)	14 mm	(0.55 inch)
Genoa sheet	10.7 m	(35.2 feet)	14 mm	(0.55 inch)
Mainsheet	26.9 m	(88.1 feet)	14 mm	(0.55 inch)
Spinnaker sheet	23.6 m	(77.5 feet)	14 mm	(0.55 inch)
Cunningham	4.3 m	(14.3 feet)	12 mm	(1/2 inch)
Kickingstrap	8.7 m	(28.5 feet)	12 mm	(1/2 inch)
Clew-outhaul	8.7 m	(28.5 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 360 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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.