Review of Rana Plast 630 Sjark

Basic specs.

The Rana Plast 630 Sjark aka Rana 630 Sjark is a small motorboat designed by the Norwegian maritime architect Eivind Amble in the early eighties. The Rana Plast 630 Sjark is built by the Norwegian yard Præsteng Industri A/S.

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Hull

The hull is made of hand laid fibreglass while the deck is made of fibreglass. Generally, a hull made of hand laid 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 interior is like most other boats made of teak. Teak has the advantage of being naturally very oily and therefore water-repellent, which is suitable on boats.
The boat is equipped with one cabin and 2 berths.

Keel

Unknown keel type

The boat can enter even shallow marinas as the draft is just about 0.70 - 0.80 meter (2.30 - 2.60 ft) dependent on the load. See immersion rate below.

Engine

Rana Plast 630 Sjark may be equipped with an inboard Yanmar diesel engine at 34 hp (25 kW). Max speed is 14.0 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.

The fuel tank, which is made of aluminium, has a capacity of 150.0 liters (39 US gallons, 32 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.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Rana Plast 630 Sjark is about 103 kg/cm, alternatively 577 lbs/inch.
Meaning: if you load 103 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 577 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 Rana Plast 630 Sjark is 2.63.

Compared with other similar motor boats it is more spacy than 58% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Curiosities

Powerboat?

In Denmark, you are required to have achieved a 'powerboat driving license' in order to sail a powerboat.
In this context a boat is considered a powerboat if:

Danish definition of a powerboat

According to this definition this boat is not categorized as a Powerboat.
Though, if you install a motor of 43 kW (58 hp), then the boat will become a powerboat, and you will need a Danish 'powerboat driving license'

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

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References

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