Review of Jarrack 33
Basic specs.
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The Jarrack 33 is 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.
Unknown keel type
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.
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.
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.
What is L/B (Length Beam Ratio)?
The l/b ratio for Jarrack 33 is 3.10.
The ballast ratio for Jarrack 33 is 42%.
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.
What is Relative Speed Performance?
The Relative Speed Performance for Jarrack 33 is 46
Maintenance
Dimensions of sail for masthead 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.
| Usage | Length | Diameter | ||
| Mainsail halyard | 30.1 m | (98.6 feet) | 10 mm | (3/8 inch) |
| Jib/genoa halyard | 30.1 m | (98.6 feet) | 10 mm | (3/8 inch) |
| Spinnaker halyard | 30.1 m | (98.6 feet) | 10 mm | (3/8 inch) |
| Jib sheet | 9.9 m | (32.6 feet) | 12 mm | (1/2 inch) |
| Genoa sheet | 9.9 m | (32.6 feet) | 12 mm | (1/2 inch) |
| Mainsheet | 24.8 m | (81.4 feet) | 12 mm | (1/2 inch) |
| Spinnaker sheet | 21.8 m | (71.7 feet) | 12 mm | (1/2 inch) |
| Cunningham | 3.3 m | (10.8 feet) | 10 mm | (3/8 inch) |
| Kickingstrap | 6.6 m | (21.7 feet) | 10 mm | (3/8 inch) |
| Clew-outhaul | 6.6 m | (21.7 feet) | 10 mm | (3/8 inch) |
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