Review of Norfolk 43

Basic specs.

The Norfolk 43 is a large sailboat designed by the American maritime architect Bruce Roberts in the late sixties.

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Interior

The boat is equipped with 3 cabins, 5 berths, a galley, toilet facility and 50.0 liter waste water capacity.

Rig

The Norfolk 43 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.

Keel

Full keel

The Norfolk 43 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 only enter major marinas as the draft is about 1.83 - 1.93 meter (6.00 - 6.30 ft) dependent on the load. See immersion rate below.

Engine

Norfolk 43 may be equipped with an inboard Perkins gasoline engine at 64 hp (47 kW). Cruise speed is 6.0 knots. Max speed is 9.0 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 300.0 liters (79 US gallons, 65 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.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Norfolk 43 is 1.73, 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 7.6 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 Norfolk 43 is about 262 kg/cm, alternatively 1472 lbs/inch.
Meaning: if you load 262 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1472 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 Norfolk 43 is 37.9.

Comparing this ratio with similar sailboats show that it is more comfortable than 82% 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 Norfolk 43 is 3.33.

Compared with other similar sailboats it is more spacy than 54% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Norfolk 43 is 29%.

This ballast ratio shows a righting moment that is higher than 8% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Norfolk 43 is 349 which categorizes this boat among 'heavy cruisers'.

8% 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 Norfolk 43 with ISO 8666 reference sail is 13.7, with a 135% genua the SA/D is 16.5.

The SA/D ratio indicates that it is faster than 2% of all similar sailboat designs in light wind.

Over- / underrigged

The Norfolk 43 has more rig than 62% of all similar sailboats, which indicates that the boat is slightly overrigged.

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 43m² (462 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 for masthead rig.

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	35.8 m	(117.5 feet)	14 mm	(0.55 inch)
Jib/genoa halyard	35.8 m	(117.5 feet)	14 mm	(0.55 inch)
Spinnaker halyard	35.8 m	(117.5 feet)	14 mm	(0.55 inch)
Jib sheet	13.2 m	(43.2 feet)	16 mm	(5/8 inch)
Genoa sheet	13.2 m	(43.2 feet)	16 mm	(5/8 inch)
Mainsheet	33.0 m	(108.1 feet)	16 mm	(5/8 inch)
Spinnaker sheet	29.0 m	(95.1 feet)	16 mm	(5/8 inch)
Cunningham	4.3 m	(14.2 feet)	14 mm	(0.55 inch)
Kickingstrap	8.7 m	(28.4 feet)	14 mm	(0.55 inch)
Clew-outhaul	8.7 m	(28.4 feet)	14 mm	(0.55 inch)

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.

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

Finally

We are always looking for new photos. If you can contribute with photos for Norfolk 43 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.