Review of IW 25 MS

Basic specs.

The IW 25 MS aka IW 25 Motorkryssar is a small motorsailer designed by the Swedish maritime architect Bror Svenningsson in the mid seventies. The IW 25 MS is built by the Swedish yard IW-Varvet.

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Hull

Both the hull and the deck is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Interior

The boat is equipped with one cabin, 4 berths and a galley.
The headroom is above average

Rig

The boat equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

Keel

Keel of IW 25 MS anno 1974.

The IW 25 MS 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 enter even shallow marinas as the draft is just about 0.75 - 0.85 meter (2.46 - 2.76 ft) dependent on the load. See immersion rate below.

Engine

IW 25 MS is typically equipped with an inboard Volvo Penta MD21A diesel engine at 75.0 hp (55 kW).

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.

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 IW 25 MS is 2.20, indicating that this boat would not 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 IW 25 MS is about 136 kg/cm, alternatively 765 lbs/inch.
Meaning: if you load 136 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 765 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 IW 25 MS is 2.83.

Compared with other similar sailboats it is more spacy than 66% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

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	7.5 m	(24.6 feet)	10 mm	(3/8 inch)
Genoa sheet	7.5 m	(24.6 feet)	10 mm	(3/8 inch)
Mainsheet	18.8 m	(61.5 feet)	10 mm	(3/8 inch)
Spinnaker sheet	16.5 m	(54.1 feet)	10 mm	(3/8 inch)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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Finally

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References

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