Review of Offshore 40
Basic specs.
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The headroom is above average
The Offshore 40 is equipped with a long keel. A long keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.
The boat can only enter major marinas as the draft is about 1.83 - 1.93 meter (6.00 - 6.30 ft) dependent on the load. See immersion rate below.
Offshore 40 is typically equipped with an inboard Perkins 4.107 diesel engine at 40.0 hp (29 kW), which gives a max speed about 5.4 knots.
The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive e.g. a sail drive.
The fuel tank which is made of aluminium has a capacity of 114.0 liters (30 US gallons, 25 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 Offshore 40 is 1.56, indicating that this boat could - if evaluated by this formula alone - 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 7.1 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 Offshore 40 is about 187 kg/cm, alternatively 1049 lbs/inch.
Meaning: if you load 187 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1049 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 Offshore 40 is 43.1.
What is L/B (Length Beam Ratio)?
The l/b ratio for Offshore 40 is 3.70.
The ballast ratio for Offshore 40 is 38%.
What is Displacement Length Ratio?
The DL-ratio for Offshore 40 is 426 which categorizes this boat among 'heavy cruisers'.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 33m2 (355 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 | 12.1 m | (39.8 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 12.1 m | (39.8 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 30.3 m | (99.4 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 26.7 m | (87.5 feet) | 14 mm | (0.55 inch) |
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