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Review of Jarrack 33


Basic specs.

sail specifications
The Jarrack 33 is a sailboat designed by the maritime architect Gösta Schärberg.

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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

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 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.


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 Jarrack 33 is 1.91, indicating that this boat could - if evaluated by this formula alone - 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 Jarrack 33 is about 212 kg/cm, alternatively 1192 lbs/inch.
Meaning: if you load 212 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1192 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 Jarrack 33 is 3.10.

Slim Wide 58% 0 50 100
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 Jarrack 33 is 41%.

Low High 50% 0 50 100
This ballast ratio shows a righting moment that is higher than 50% of all similar sailboat designs. This righting moment (ability to resist heeling) is spot on average!


SA/D (Sail Area Displacement ratio)

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

The SA/D for Jarrack 33 with ISO 8666 reference sail is 15.1, with a 135% genua the SA/D is 18.0.

Low High 27% 0 50 100
The SA/D ratio indicates that it is faster than 27% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 50% 0 50 100
The Jarrack 33 has more rig than 50% of all similar sailboats, which indicates that this rig is spot on average!


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Jarrack 33 is 46

Slow Fast 46% 0 50 100
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 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
UsageLengthDiameter
Mainsail halyard 30.1 m(98.6 feet)10 mm(3/8 inch)
Jib/genoa halyard30.1 m(98.6 feet)10 mm(3/8 inch)
Spinnaker halyard30.1 m(98.6 feet)10 mm(3/8 inch)
Jib sheet 9.9 m(32.6 feet)12 mm(1/2 inch)
Genoa sheet9.9 m(32.6 feet)12 mm(1/2 inch)
Mainsheet 24.8 m(81.4 feet)12 mm(1/2 inch)
Spinnaker sheet21.8 m(71.7 feet)12 mm(1/2 inch)
Cunningham3.3 m(10.8 feet)10 mm(3/8 inch)
Kickingstrap6.6 m(21.7 feet)10 mm(3/8 inch)
Clew-outhaul6.6 m(21.7 feet)10 mm(3/8 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 Jarrack 33 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