Review of Sunbeam 39.2
Basic specs.
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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.
Interior
The boat is equipped with 4+2 berths.
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 Sunbeam 39.2 is 1.21, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
The capsize screening value for Sunbeam 39.2 is 1.21, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
Theoretical Maximum Hull Speed
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 8.4 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 theoretical maximal speed of a displacement boat of this length is 8.4 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.
Immersion rate
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Sunbeam 39.2 is about 200 kg/cm, alternatively 1120 lbs/inch.
Meaning: if you load 200 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1120 lbs cargo on the boat it will sink 1 inch.
Meaning: if you load 200 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1120 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 22,000 different boat types and 350,000 data points.
Motion Comfort Ratio
What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Sunbeam 39.2 is 46.7.
Comparing this ratio with similar sailboats show that it is more comfortable than 99% of all similar sailboat designs.
This is a comfort value significantly above average.
The Motion Comfort Ratio for Sunbeam 39.2 is 46.7.
L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for Sunbeam 39.2 is 4.92.
Compared with other similar sailboats it is slimmer than 100% of all other designs.
It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.
The l/b ratio for Sunbeam 39.2 is 4.92.
D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for Sunbeam 39.2 is 146 which categorizes this boat among 'ultra light racers'.
88% of all similar sailboat designs are categorized as heavier.
A light displacement requires less sailarea and has higher accellerations.
The DL-ratio for Sunbeam 39.2 is 146 which categorizes this boat among 'ultra light racers'.
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.
| Usage | Length | Diameter | ||
|---|---|---|---|---|
| Jib sheet | 12.3 m | (40.4 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 12.3 m | (40.4 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 30.8 m | (100.9 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 27.1 m | (88.8 feet) | 14 mm | (0.55 inch) |
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References