Review of Javelin 30

Javelin 30
Javelin 30 anno 1976.

Basic specs.

sail specifications
The Javelin 30 is a sailboat designed by the maritime architect Frederick Robert Parker.

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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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

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 of Javelin 30 anno 1976.

The boat is typically equipped with an inboard Bukh diesel engine at 20.0 hp (14 kW), which gives a max speed about 5.7 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 Javelin 30 is 1.84, 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 6.3 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 Javelin 30 is about 123 kg/cm, alternatively 691 lbs/inch.
Meaning: if you load 123 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 691 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 Javelin 30 is 25.1.

Low High 58% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 58% 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 Javelin 30 is 3.37.

Wide Slim 76% 0 50 100
Compared with other similar sailboats it is slimmer than 76% of all other designs. It seems that the designer has chosen a significantly more speedy hull design.

D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for Javelin 30 is 315 which categorizes this boat among 'medium weight cruisers'.

Heavy Light 24% 0 50 100
24% 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 Javelin 30 with ISO 8666 reference sail is 13.8, with a 135% genua the SA/D is 16.6.

Low High 21% 0 50 100
The SA/D ratio indicates that it is faster than 21% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Javelin 30 is 34

Slow Fast 34% 0 50 100
The relative speed performance is 34 which means that a it is faster than 34% of all similar sailboat designs.


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
Mainsail halyard 23.1 m(75.8 feet)10 mm(3/8 inch)
Jib/genoa halyard23.1 m(75.8 feet)10 mm(3/8 inch)
Spinnaker halyard23.1 m(75.8 feet)10 mm(3/8 inch)
Jib sheet 9.3 m(30.4 feet)12 mm(1/2 inch)
Genoa sheet9.3 m(30.4 feet)12 mm(1/2 inch)
Mainsheet 23.2 m(76.0 feet)12 mm(1/2 inch)
Spinnaker sheet20.4 m(66.9 feet)12 mm(1/2 inch)
Cunningham2.9 m(9.6 feet)10 mm(3/8 inch)
Kickingstrap5.9 m(19.2 feet)10 mm(3/8 inch)
Clew-outhaul5.9 m(19.2 feet)10 mm(3/8 inch)

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