Review of O'Day 28

Basic specs.

The O'Day 28 is a sailboat designed by the American maritime architect bureau C Raymond Hunt Associates, Inc. in the late seventies. Several hundred boats have been produced. The O'Day 28 is built by the American yard Bangor Punta Marine.

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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.

Keel

The O'Day 28 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The boat can enter even shallow marinas as the draft is just about 1.37 - 1.47 meter (4.49 - 4.79 ft) dependent on the load. See immersion rate below.

Engine

The boat is typically equipped with an inboard Universal 12 diesel engine at 10.0 hp (7 kW), which gives a max speed about 4.2 knots.

The fuel tank has a capacity of 68.0 liters (17 US gallons, 14 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 O'Day 28 is 2.11, indicating that this boat would not 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 6.4 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 O'Day 28 is about 146 kg/cm, alternatively 818 lbs/inch.
Meaning: if you load 146 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 818 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 O'Day 28 is 2.76.

Compared with other similar sailboats it is more spacy than 82% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for O'Day 28 is 270 which categorizes this boat among 'light crusers & offshore racers'.

42% 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 O'Day 28 with ISO 8666 reference sail is 15.7, with a 135% genua the SA/D is 18.9.

The SA/D ratio indicates that it is faster than 46% of all similar sailboat designs in light wind.

Over- / underrigged

The O'Day 28 has more rig than 96% of all similar sailboats, which indicates that the boat is significantly 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 24m² (258 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	24.6 m	(80.5 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	24.6 m	(80.5 feet)	8 mm	(5/16 inch)
Spinnaker halyard	24.6 m	(80.5 feet)	8 mm	(5/16 inch)
Jib sheet	8.6 m	(28.2 feet)	10 mm	(3/8 inch)
Genoa sheet	8.6 m	(28.2 feet)	10 mm	(3/8 inch)
Mainsheet	21.5 m	(70.6 feet)	10 mm	(3/8 inch)
Spinnaker sheet	18.9 m	(62.1 feet)	10 mm	(3/8 inch)
Cunningham	3.0 m	(10.0 feet)	8 mm	(5/16 inch)
Kickingstrap	6.1 m	(20.0 feet)	8 mm	(5/16 inch)
Clew-outhaul	6.1 m	(20.0 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.

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Finally

We are always looking for new photos. If you can contribute with photos for O'Day 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

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