Review of Dreadnought 32

Basic specs.

The Dreadnought 32 is a sailboat designed by the maritime architect John G. Hanna together with William Ion Belton Crealock from United Kingdom of Great Britain and Northern Ireland in the early seventies. Less than 100 boats have been produced. The Dreadnought 32 is built by the American yard Dreadnought Boatworks.

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Hull

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.

Rig

Rig of Dreadnought 32 anno 1977.

Keel

The Dreadnought 32 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 1.42 - 1.52 meter (4.66 - 4.96 ft) dependent on the load. See immersion rate below.

Engine

The boat is typically equipped with an inboard SAAB diesel engine at 10.0 hp (7 kW), which gives a max speed about 2.9 knots.

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 Dreadnought 32 is 1.59, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.3 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Dreadnought 32 is about 200 kg/cm, alternatively 1124 lbs/inch.
Meaning: if you load 200 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1124 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Dreadnought 32 is 42.3.

Comparing this ratio with similar sailboats show that it is more comfortable than 100% of all similar sailboat designs. This is a comfort value significantly above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Dreadnought 32 is 2.97.

Compared with other similar sailboats it is more spacy than 69% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Dreadnought 32 is 330 which categorizes this boat among 'heavy cruisers'.

15% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Dreadnought 32 with ISO 8666 reference sail is 13.7, with a 135% genua the SA/D is 16.4.

The SA/D ratio indicates that it is faster than 15% of all similar sailboat designs in light wind.

Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 32m² (344 ft²).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.

Rig

Dimensions of sail.

Are your sails worn out? You might find your next sail here: Sails for Sale

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
Mainsail halyard	26.8 m	(88.0 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	26.8 m	(88.0 feet)	10 mm	(3/8 inch)
Spinnaker halyard	26.8 m	(88.0 feet)	10 mm	(3/8 inch)
Jib sheet	9.8 m	(32.0 feet)	12 mm	(1/2 inch)
Genoa sheet	9.8 m	(32.0 feet)	12 mm	(1/2 inch)
Mainsheet	24.4 m	(80.0 feet)	12 mm	(1/2 inch)
Spinnaker sheet	21.5 m	(70.4 feet)	12 mm	(1/2 inch)
Cunningham	5.1 m	(16.8 feet)	10 mm	(3/8 inch)
Kickingstrap	10.2 m	(33.5 feet)	10 mm	(3/8 inch)
Clew-outhaul	10.2 m	(33.5 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.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

Finally

We are always looking for new photos. If you can contribute with photos for Dreadnought 32 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.