Review of Motiva 46
Basic specs.
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Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.
The Motiva 46 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 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.
Motiva 46 can only enter major marinas as the draft is about 1.80 - 1.90 meter (5.91 - 6.21 ft) dependent on the load. See immersion rate below.
The boat is typically equipped with an inboard Ford engine at 135.0 hp (100 kW), which gives a max speed about 7.7 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 steel has a capacity of 1600.0 liters (422 US gallons, 351 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 Motiva 46 is 1.58, 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 8.2 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 Motiva 46 is about 335 kg/cm, alternatively 1876 lbs/inch.
Meaning: if you load 335 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1876 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 Motiva 46 is 52.2.
What is L/B (Length Beam Ratio)?
The l/b ratio for Motiva 46 is 3.23.
The ballast ratio for Motiva 46 is 28%.
What is Displacement Length Ratio?
The DL-ratio for Motiva 46 is 392 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 53m2 (570 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 | 14.0 m | (46.0 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 14.0 m | (46.0 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 35.1 m | (115.1 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 30.9 m | (101.3 feet) | 16 mm | (5/8 inch) |
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