Review of S 30 Joker

Basic specs.

The S 30 Joker aka Joker is a sailboat designed by the Swedish maritime architect Rolf Magnusson in the late sixties.

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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 S 30 Joker is 2.00, indicating that this boat would not be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for S 30 Joker is about 182 kg/cm, alternatively 1021 lbs/inch.
Meaning: if you load 182 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1021 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for S 30 Joker is 3.11.

Compared with other similar sailboats it is more spacy than 50% of all other designs. It seems that the designer has chosen an average hull design.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for S 30 Joker with ISO 8666 reference sail is 14.9, with a 135% genua the SA/D is 17.9.

The SA/D ratio indicates that it is faster than 34% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for S 30 Joker is 46

The relative speed performance is 46 which means that a it is faster than 46% of all similar sailboat designs.

Maintenance

Rig

Dimensions of sail.

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	25.2 m	(82.8 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	25.2 m	(82.8 feet)	10 mm	(3/8 inch)
Spinnaker halyard	25.2 m	(82.8 feet)	10 mm	(3/8 inch)
Jib sheet	9.2 m	(30.2 feet)	12 mm	(1/2 inch)
Genoa sheet	9.2 m	(30.2 feet)	12 mm	(1/2 inch)
Mainsheet	23.0 m	(75.5 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.2 m	(66.4 feet)	12 mm	(1/2 inch)
Cunningham	2.8 m	(9.2 feet)	10 mm	(3/8 inch)
Kickingstrap	5.6 m	(18.4 feet)	10 mm	(3/8 inch)
Clew-outhaul	5.6 m	(18.4 feet)	10 mm	(3/8 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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Finally

We are always looking for new photos. If you can contribute with photos for S 30 Joker 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.