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Review of Davidson 28


Basic specs.

sail specifications
The Davidson 28 is a sailboat designed by the New Zealander maritime architect Lawrence Karl Davidson in the mid seventies. A few hundred boats have been produced. The Davidson 28 is built by Dave Blundell.

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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
The boat 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

The Davidson 28 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a long keel.

The boat can enter most marinas as the draft is just about 1.62 - 1.72 meter (5.31 - 5.61 ft) dependent on the load. See immersion rate below.


Engine

The boat is typically equipped with an inboard Bukh diesel engine.


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 Davidson 28 is 1.79, 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 6.7 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 Davidson 28 is about 144 kg/cm, alternatively 811 lbs/inch.
Meaning: if you load 144 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 811 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 Davidson 28 is 27.3.

Low High 82% 0 50 100
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 Davidson 28 is 3.00.

Slim Wide 58% 0 50 100
Compared with other similar sailboats it is more spacy than 58% 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 Davidson 28 is 257 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 46% 0 50 100
46% 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 Davidson 28 with ISO 8666 reference sail is 13.3, with a 135% genua the SA/D is 15.9.

Low High 18% 0 50 100
The SA/D ratio indicates that it is faster than 18% 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 25m2 (269 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.

mainsail specifications headsail specifications

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
UsageLengthDiameter
Mainsail halyard 24.2 m(79.2 feet)8 mm(5/16 inch)
Jib/genoa halyard24.2 m(79.2 feet)8 mm(5/16 inch)
Spinnaker halyard24.2 m(79.2 feet)8 mm(5/16 inch)
Jib sheet 8.5 m(27.9 feet)10 mm(3/8 inch)
Genoa sheet8.5 m(27.9 feet)10 mm(3/8 inch)
Mainsheet 21.3 m(69.8 feet)10 mm(3/8 inch)
Spinnaker sheet18.7 m(61.4 feet)10 mm(3/8 inch)
Cunningham3.2 m(10.5 feet)8 mm(5/16 inch)
Kickingstrap6.4 m(21.0 feet)8 mm(5/16 inch)
Clew-outhaul6.4 m(21.0 feet)8 mm(5/16 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 Davidson 28 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