Review of Sweline 36

Basic specs.

The Sweline 36 is a sailboat designed by the maritime architect Thord Gustafsson. The Sweline 36 is built by the Swedish yard APC Composit AB.

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Hull

The hull is a double hull which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.

Interior

The boat is equipped with 9 berths, a galley and toilet facility.

Rig

The Sweline 36 is equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.

Keel

The Sweline 36 has been built with different keel alternatives.

Fin keel

One option is a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can only enter major marinas as the draft is about 1.86 - 1.96 meter (6.10 - 6.40 ft) dependent on the load. See immersion rate below.

Wing keel

But be aware that even though a Wing Keel keel is very good for speed racing, a fishing nets and the like in the water can easily make you into a troublesome situation.

Sweline 36 can enter even shallow marinas as the draft is just about 1.41 - 1.51 meter (4.63 - 4.93 ft) dependent on the load. See immersion rate below.

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 Sweline 36 is 2.04, 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 Sweline 36 is about 259 kg/cm, alternatively 1453 lbs/inch.
Meaning: if you load 259 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1453 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 Sweline 36 is 3.20.

Compared with other similar sailboats it is more spacy than 54% 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 Sweline 36 is 36%.

This ballast ratio shows a righting moment that is higher than 31% of all similar sailboat designs. A righting moment (ability to resist heeling) just below average.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Sweline 36 with ISO 8666 reference sail is 19.4, with a 135% genua the SA/D is 22.1.

The SA/D ratio indicates that it is faster than 79% of all similar sailboat designs in light wind.

Over- / underrigged

The Sweline 36 has more rig than 90% of all similar sailboats, which indicates that the boat is significantly overrigged.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Sweline 36 is 93

The relative speed performance is 93 which means that a it is faster than 93% of all similar sailboat designs.

Maintenance

Rig

Dimensions of sail for fractional 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	36.0 m	(118.3 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	36.0 m	(118.3 feet)	12 mm	(1/2 inch)
Spinnaker halyard	36.0 m	(118.3 feet)	12 mm	(1/2 inch)
Jib sheet	11.1 m	(36.5 feet)	14 mm	(0.55 inch)
Genoa sheet	11.1 m	(36.5 feet)	14 mm	(0.55 inch)
Mainsheet	27.8 m	(91.3 feet)	14 mm	(0.55 inch)
Spinnaker sheet	24.5 m	(80.3 feet)	14 mm	(0.55 inch)
Cunningham	4.8 m	(15.7 feet)	12 mm	(1/2 inch)
Kickingstrap	9.6 m	(31.5 feet)	12 mm	(1/2 inch)
Clew-outhaul	9.6 m	(31.5 feet)	12 mm	(1/2 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 Sweline 36 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.