Review of Jonmeri 33

Basic specs.

The Jonmeri 33 aka Jon Meri 33 is a sailboat designed by the maritime architect Jorma Nyman. The Jonmeri 33 is built by the Finnish yard Maestro Boats.

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Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Interior

The boat is equipped with 6 berths.

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 boat can enter most marinas as the draft is just about 1.65 - 1.75 meter (5.41 - 5.71 ft) dependent on the load. See immersion rate below.

Engine

Jonmeri 33 is typically equipped with a diesel engine at 30.0 hp (22 kW).

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 Jonmeri 33 is 1.97, 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 Jonmeri 33 is about 225 kg/cm, alternatively 1261 lbs/inch.
Meaning: if you load 225 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1261 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 Jonmeri 33 is 3.01.

Compared with other similar sailboats it is more spacy than 69% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Jonmeri 33 with ISO 8666 reference sail is 17.2, with a 135% genua the SA/D is 20.6.

The SA/D ratio indicates that it is faster than 58% of all similar sailboat designs in light wind.

Maintenance

Rig

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.

**Guiding dimensions of running rig**
Usage	Length		Diameter
Mainsail halyard	31.3 m	(102.7 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	31.3 m	(102.7 feet)	10 mm	(3/8 inch)
Spinnaker halyard	31.3 m	(102.7 feet)	10 mm	(3/8 inch)
Jib sheet	10.1 m	(33.0 feet)	12 mm	(1/2 inch)
Genoa sheet	10.1 m	(33.0 feet)	12 mm	(1/2 inch)
Mainsheet	25.2 m	(82.6 feet)	12 mm	(1/2 inch)
Spinnaker sheet	22.2 m	(72.7 feet)	12 mm	(1/2 inch)
Cunningham	3.6 m	(11.9 feet)	10 mm	(3/8 inch)
Kickingstrap	7.3 m	(23.9 feet)	10 mm	(3/8 inch)
Clew-outhaul	7.3 m	(23.9 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.

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Finally

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References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.