Review of Motiva 57

Basic specs.

The Motiva 57 is a large motorsailer designed by the Danish maritime architect Arne Borghegn.

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Hull

The hull is made of steel.

Interior

The boat is equipped with a galley, toilet facility and 360 liter waste water capacity.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Rig

The boat equipped with a ketch rig.

Engine

Motiva 57 is typically equipped with an inboard Perkins engine at 130.0 hp (96 kW), which gives a max speed about 6.9 knots.

The fuel tank has a capacity of 1800 liters (475 US gallons, 395 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.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Motiva 57 is 1.53, 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 9.2 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Motiva 57 is about 459 kg/cm, alternatively 2575 lbs/inch.
Meaning: if you load 459 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2575 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Motiva 57 is 3.59.

Compared with other similar sailboats it is more spacy than 50% of all other designs. It seems that the designer has chosen an average hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Motiva 57 is 303 which categorizes this boat among 'medium weight cruisers'.

14% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

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.

**Guiding dimensions of running rig**
Usage	Length		Diameter
Jib sheet	17.2 m	(56.5 feet)	16 mm	(5/8 inch)
Genoa sheet	17.2 m	(56.5 feet)	16 mm	(5/8 inch)
Mainsheet	43.1 m	(141.3 feet)	16 mm	(5/8 inch)
Spinnaker sheet	37.9 m	(124.4 feet)	16 mm	(5/8 inch)

Boat owner's ideas

This section is reserved boat owner's changes, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

Finally

We are always looking for new photos. If you can contribute with photos for Motiva 57 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.

References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.