Review of Jupiter 30 (S)

Basic specs.

The Jupiter 30 (S) also known as Jupiter 1/2 Ton is a sailboat designed by the Dutch maritime architect E. G. van de Stadt. The Jupiter 30 (S) is built by Jupiter Yachts.

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Interior

The boat is equipped with 5 berths.

Keel

Unknown keel type

The boat can enter most marinas as the draft is just about 1.75 - 1.85 meter (5.74 - 6.04 ft) dependent on the load. See immersion rate below.

Engine

Jupiter 30 (S) may be equipped with an inboard diesel engine at 11 hp (8 kW).

The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.

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 Jupiter 30 (S) is 2.23, 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 Jupiter 30 (S) is about 193 kg/cm, alternatively 1086 lbs/inch.
Meaning: if you load 193 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1086 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 Jupiter 30 (S) is 2.79.

Compared with other similar sailboats it is more spacy than 79% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

SA/D (Sail Area Displacement ratio)

SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 23.91

Maintenance

Rig

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
Jib sheet	9.0 m	(29.5 feet)	10 mm	(3/8 inch)
Genoa sheet	9.0 m	(29.5 feet)	10 mm	(3/8 inch)
Mainsheet	22.5 m	(73.7 feet)	10 mm	(3/8 inch)
Spinnaker sheet	19.8 m	(64.9 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.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

Finally

We are always looking for new photos. If you can contribute with photos for Jupiter 30 (S) 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.