Review of Somo 27
Basic specs.
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The boat is equipped with 2 cabins, 4 berths, 70.0 liter fresh water capacity and toilet facility.
Unknown keel type
The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.
The boat can enter most marinas as the draft is just about 1.70 - 1.80 meter (5.58 - 5.88 ft) dependent on the load. See immersion rate below.
The Somo 27 has been equipped with different engine alternatives.
Alternative 1:
Somo 27 may be equipped with an inboard Solé diesel engine at 12 hp (8 kW). Calculated max speed is about 4.9 knots
Alternative 2:
The boat may be equipped with an inboard Nanni diesel engine at 13 hp (9 kW). Calculated max speed is about 5.1 knots
The fuel tank has a capacity of 30.0 liters (7 US gallons, 6 imperial gallons).
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 Somo 27 is 2.05, indicating that this boat would not be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 6.4 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Somo 27 is about 132 kg/cm, alternatively 740 lbs/inch.
Meaning: if you load 132 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 740 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 Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Somo 27 is 20.2.
What is L/B (Length Beam Ratio)?
The l/b ratio for Somo 27 is 2.81.
The ballast ratio for Somo 27 is 32%.
What is Displacement Length Ratio?
The DL-ratio for Somo 27 is 237 which categorizes this boat among 'light crusers & offshore racers'.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 24m2 (258 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.
Note: If you use a paint roller you will need more paint than if you use a paintbrush.
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.
| Usage | Length | Diameter | ||
|---|---|---|---|---|
| Jib sheet | 8.1 m | (26.4 feet) | 10 mm | (3/8 inch) |
| Genoa sheet | 8.1 m | (26.4 feet) | 10 mm | (3/8 inch) |
| Mainsheet | 20.1 m | (66.0 feet) | 10 mm | (3/8 inch) |
| Spinnaker sheet | 17.7 m | (58.1 feet) | 10 mm | (3/8 inch) |
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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