Review of Motiva 42 Dobbeltender

Basic specs.

The Motiva 42 Dobbeltender is a large motorsailer designed by the Danish maritime architect Arne Borghegn.

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Interior

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Keel

Unknown keel type

The boat 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.

Engine

Motiva 42 Dobbeltender is typically equipped with a diesel engine at 120 hp (89 kW)..

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 42 Dobbeltender is 1.69, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Motiva 42 Dobbeltender is about 360 kg/cm, alternatively 2018 lbs/inch.
Meaning: if you load 360 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2018 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 42 Dobbeltender is 3.02.

Compared with other similar sailboats it is more spacy than 82% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Motiva 42 Dobbeltender is 30%.

This ballast ratio shows a righting moment that is higher than 8% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.

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	12.8 m	(41.8 feet)	14 mm	(0.55 inch)
Genoa sheet	12.8 m	(41.8 feet)	14 mm	(0.55 inch)
Mainsheet	31.9 m	(104.6 feet)	14 mm	(0.55 inch)
Spinnaker sheet	28.1 m	(92.0 feet)	14 mm	(0.55 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, 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 42 Dobbeltender 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.