Review of Banner 1/2 Ton

Basic specs.

The Banner 1/2 Ton is a sailboat designed by the German maritime architect bureau judel / vrolijk & co - engineering GmbH.

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Interior

The boat is equipped with 5 berths.

Keel

Keel of Banner 1/2 Ton anno 1986. Banner 1/2 ton Ronja Rövardotter

Unknown keel type

The boat can only enter major marinas as the draft is about 1.84 - 1.94 meter (6.04 - 6.34 ft) dependent on the load.

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 Banner 1/2 Ton is 2.28, indicating that this boat would not be accepted to participate in ocean races.

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 Banner 1/2 Ton is 2.89.

Compared with other similar sailboats it is more spacy than 73% 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 Banner 1/2 Ton is 43%.

This ballast ratio shows a righting moment that is higher than 62% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

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): 27.90

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Banner 1/2 Ton is 90

The relative speed performance is 90 which means that a it is faster than 90% of all similar sailboat designs.

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	9.2 m	(30.1 feet)	12 mm	(1/2 inch)
Genoa sheet	9.2 m	(30.1 feet)	12 mm	(1/2 inch)
Mainsheet	22.9 m	(75.1 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.2 m	(66.1 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

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References

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