Review of Powles 40 Aft Cockpit

Basic specs.

The Powles 40 Aft Cockpit is a large motorboat designed in the late seventies. Only a few boats have been produced. The Powles 40 Aft Cockpit is built by the British yard Jack Powels International Marine Ltd..

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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.

Interior

The boat is equipped with one cabin, 2+2 berths, a galley, 430.0 liter fresh water capacity and toilet facility.

Engine

The boat may be equipped with dual inboard Volvo Penta TAMD 60B diesel engines at 442 hp (329 kW). Max speed is 22.0 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 has a capacity of 909.0 liters (240 US gallons, 199 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 Powles 40 Aft Cockpit is about 335 kg/cm, alternatively 1876 lbs/inch.
Meaning: if you load 335 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1876 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 Powles 40 Aft Cockpit is 2.98.

Compared with other similar motor boats it is more spacy than 73% 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 categorized as a Powerboat.

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.