Review of Scanner 391
Basic specs.
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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.
The boat is equipped with 6 berths.
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.
Fin keel
The Scanner 391 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full 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.
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.
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.
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.
What is L/B (Length Beam Ratio)?
The l/b ratio for Scanner 391 is 3.26.
The ballast ratio for Scanner 391 is 38%.
Maintenance
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.
| Masthead rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 11.7 m | (38.5 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 11.7 m | (38.5 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 29.3 m | (96.1 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 25.8 m | (84.6 feet) | 14 mm | (0.55 inch) |
| Fractional rig | ||||
| Usage | Length | Diameter | ||
| Mainsail halyard | 36.9 m | (121.1 feet) | 12 mm | (1/2 inch) |
| Jib/genoa halyard | 36.9 m | (121.1 feet) | 12 mm | (1/2 inch) |
| Spinnaker halyard | 36.9 m | (121.1 feet) | 12 mm | (1/2 inch) |
| Jib sheet | 11.7 m | (38.5 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 11.7 m | (38.5 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 29.3 m | (96.1 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 25.8 m | (84.6 feet) | 14 mm | (0.55 inch) |
| Cunningham | 4.8 m | (15.6 feet) | 12 mm | (1/2 inch) |
| Kickingstrap | 9.5 m | (31.2 feet) | 12 mm | (1/2 inch) |
| Clew-outhaul | 9.5 m | (31.2 feet) | 12 mm | (1/2 inch) |
| Fractional rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 11.7 m | (38.5 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 11.7 m | (38.5 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 29.3 m | (96.1 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 25.8 m | (84.6 feet) | 14 mm | (0.55 inch) |
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