Review of Raft 4

Basic specs.

The Raft 4 is a small rib. The Raft 4 is built by the Ukrainian yard Brig.

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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.

EU classification

Raft 4 holds one CE certification:

If less than 4 in on board the boat is by European Union certified as Class D. SHELTERED WATERS:

Designed for voyages on sheltered coastal waters, small bays, small lakes, rivers and canals when conditions up to, and including, wind force 4 (Beaufort scale) and significant wave heights up to, and including, 0,3 m may be experienced, with occasional waves of 0,5 m maximum height, for example from passing vessels.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Raft 4 is about 32 kg/cm, alternatively 180 lbs/inch.
Meaning: if you load 32 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 180 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 Raft 4 is 2.13.

Compared with other similar RIBs it is slimmer than 86% of all other designs. It seems that the designer has chosen a significantly more speedy hull design.

Maintenance

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.

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Finally

We are always looking for new photos. If you can contribute with photos for Raft 4 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.