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Review of Scanner 391


Basic specs.

sail specifications
The Scanner 391 is a sailboat designed by the maritime architect Nils-Eric Olofsson. The Scanner 391 is built by the Swedish yard Scanyacht AB.

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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.
The hull is a double hull which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.


Interior

The boat is equipped with 6 berths.


Rig

The boat has multiple rigs.

One option is a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.

Another option is 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

Fin keel

The Scanner 391 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long 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.

Scanner 391 can only enter major marinas as the draft is about 1.90 - 2.00 meter (6.23 - 6.53 ft) dependent on the load. See immersion rate below.


Engine

The boat may be equipped with an inboard Volvo Penta MD2030 diesel engine at 29 hp (21 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 Scanner 391 is 2.02, 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 Scanner 391 is about 282 kg/cm, alternatively 1582 lbs/inch.
Meaning: if you load 282 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1582 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 Scanner 391 is 3.26.

Slim Wide 54% 0 50 100
Compared with other similar sailboats it is more spacy than 54% 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 Scanner 391 is 38%.

Low High 42% 0 50 100
This ballast ratio shows a righting moment that is higher than 42% of all similar sailboat designs. A righting moment (ability to resist heeling) just below average.


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
Masthead rig
UsageLengthDiameter
Jib sheet 11.7 m(38.5 feet)14 mm(0.55 inch)
Genoa sheet11.7 m(38.5 feet)14 mm(0.55 inch)
Mainsheet 29.3 m(96.1 feet)14 mm(0.55 inch)
Spinnaker sheet25.8 m(84.6 feet)14 mm(0.55 inch)
Fractional rig
UsageLengthDiameter
Mainsail halyard 36.9 m(121.1 feet)12 mm(1/2 inch)
Jib/genoa halyard36.9 m(121.1 feet)12 mm(1/2 inch)
Spinnaker halyard36.9 m(121.1 feet)12 mm(1/2 inch)
Jib sheet 11.7 m(38.5 feet)14 mm(0.55 inch)
Genoa sheet11.7 m(38.5 feet)14 mm(0.55 inch)
Mainsheet 29.3 m(96.1 feet)14 mm(0.55 inch)
Spinnaker sheet25.8 m(84.6 feet)14 mm(0.55 inch)
Cunningham4.8 m(15.6 feet)12 mm(1/2 inch)
Kickingstrap9.5 m(31.2 feet)12 mm(1/2 inch)
Clew-outhaul9.5 m(31.2 feet)12 mm(1/2 inch)
Fractional rig
UsageLengthDiameter
Jib sheet 11.7 m(38.5 feet)14 mm(0.55 inch)
Genoa sheet11.7 m(38.5 feet)14 mm(0.55 inch)
Mainsheet 29.3 m(96.1 feet)14 mm(0.55 inch)
Spinnaker sheet25.8 m(84.6 feet)14 mm(0.55 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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If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.



References