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Review of Najad 34


Najad 34
Najad 34 anno 1977.

Basic specs.

boat specifications
The Najad 34 is a motorsailer designed by the maritime architect Olle Enderlein in the early seventies. Several hundred boats have been produced. The Najad 34 is built by the Swedish yard Najad Varvet AB.

Looking for a new boat? Find a Najad 34 or similar boat for sale

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

Interior
The boat is equipped with 3 cabins, 6 berths, a galley and toilet facility.

Rig
The boat has more than one rig.

One option is 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
Keel of Najad 34 anno 1978.
Najad 34 has a long keel which means better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space. The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allow a minor keel and hence less water resistance and higher speed. The boat can enter most marinas as the draft is just about 1.60 - 1.70 meter (5.25 - 5.55 ft) dependent on the load. See immersion rate below.

Engine
Najad 34 is typical equipped with an inboard Volvo Penta MD17C engine at 35.0 hp (26 kW), which gives a max speed about 6.3 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 has a capacity of 150 liters (39 US 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 34 is 1.72, 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 7.0 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 34 is about 174 kg/cm, alternative 976 lbs/inch.
Meaning: if you load 174 kg cargo on the boat then it will sink 1 cm. Alternative, if you load 976 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 22,000 boat types and 350,000 data points.

Motion Comfort Ratio
What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Najad 34 is 31.2.

Low High 79% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 79% of all similar sailboat designs. A comfort value significantly above average.

L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for Najad 34 is 3.37.

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


Ballast Ratio
What is a Ballast Ratio?
The ballast ratio for Najad 34 is 41%.

Low High 54% 0 50 100
This ballast ratio shows a righting moment that is higher than 54% 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 34 is 282 which categorizes this boat among 'medium weight cruisers'.

Heavy Light 34% 0 50 100
34% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Najad 34 with ISO 8666 reference sail is 14.7, with a 135% genua the SA/D is 17.4.

Low High 24% 0 50 100
The SA/D ratio indicates that it is faster than 24% of all similar sailboat designs in light wind. Don't panic! It is expected that motor sailers has a low SA/D value as this is the natural consequence of the design combining sailing and motor boat characteristics.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Najad 34 is 5

Slow Fast 5% 0 50 100
The relative speed performance is 5 which means that a it is faster than 5% of all similar sailboat designs. As this boat is a motor sailer, it is expected that the performance of a motor sailer for sail alone is lower than a dedicated sailboat.

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 20m2 (215 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 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
Masthead rig
UsageLengthDiameter
Mainsail halyard 29.4 m(96.5 feet)10 mm(3/8 inch)
Jib/genoa halyard29.4 m(96.5 feet)10 mm(3/8 inch)
Spinnaker halyard29.4 m(96.5 feet)10 mm(3/8 inch)
Jib sheet 10.4 m(34.3 feet)12 mm(1/2 inch)
Genoa sheet10.4 m(34.3 feet)12 mm(1/2 inch)
Mainsheet 26.1 m(85.7 feet)12 mm(1/2 inch)
Spinnaker sheet23.0 m(75.4 feet)12 mm(1/2 inch)
Cunningham4.2 m(13.6 feet)10 mm(3/8 inch)
Kickingstrap8.3 m(27.2 feet)10 mm(3/8 inch)
Clew-outhaul8.3 m(27.2 feet)10 mm(3/8 inch)
Masthead rig
UsageLengthDiameter
Mainsail halyard 26.8 m(87.9 feet)10 mm(3/8 inch)
Jib/genoa halyard26.8 m(87.9 feet)10 mm(3/8 inch)
Spinnaker halyard26.8 m(87.9 feet)10 mm(3/8 inch)
Jib sheet 10.4 m(34.3 feet)12 mm(1/2 inch)
Genoa sheet10.4 m(34.3 feet)12 mm(1/2 inch)
Mainsheet 26.1 m(85.7 feet)12 mm(1/2 inch)
Spinnaker sheet23.0 m(75.4 feet)12 mm(1/2 inch)
Cunningham4.2 m(13.6 feet)10 mm(3/8 inch)
Kickingstrap8.3 m(27.2 feet)10 mm(3/8 inch)
Clew-outhaul8.3 m(27.2 feet)10 mm(3/8 inch)


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References