Review of IW 25 MS
Basic specs.
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The hull 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.
The boat is equipped with one cabin, 4 berths and a galley.
The IW 25 MS is 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.
Full keel
The IW 25 MS is equipped with a long keel. A full 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.
The IW 25 MS has been equipped with different engine alternatives.
Alternative 1:
IW 25 MS may be equipped with an inboard Volvo Penta MD21A diesel engine at 75 hp (55 kW). Cruise speed is 8.0 knots. Max speed is 12.0 knots.
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.
Alternative 2:
The boat may be equipped with an inboard Volvo Penta MD diesel engine at 21 hp (15 kW).
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance 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.
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.
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.
What is L/B (Length Beam Ratio)?
The l/b ratio for IW 25 MS is 2.83.
Maintenance
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 | 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) |
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