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Review of O'Day 280


Basic specs.

boat specifications
The O'Day 280 is a sailboat designed by the maritime architect bureau C. Raymond Hunt Associates in the late eighties. The O'Day 280 is built by the American yard O'Day Corp..

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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 boat has a fin keel which means that it is more manoeuvrable but has less directional stability than a similar boat with a long keel. The boat can enter even shallow marinas as the draft is just about 0.89 - 0.99 meter (2.92 - 3.22 ft) dependent on the load. See immersion rate below.

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 280 is 2.12, 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 280 is about 128 kg/cm, alternative 718 lbs/inch.
Meaning: if you load 128 kg cargo on the boat then it will sink 1 cm. Alternative, if you load 718 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 22,000 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 280 is 3.22.

Wide Slim 66% 0 50 100
Compared with other similar sailboats it is slimmer than 66% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.


Ballast Ratio
What is a Ballast Ratio?
The ballast ratio for O'Day 280 is 38%.

Low High 34% 0 50 100
This ballast ratio shows a righting moment that is higher than 34% of all similar sailboat designs. A righting moment (ability to resist heeling) just below average.

D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for O'Day 280 is 181 which categorizes this boat among 'light racers'.

Heavy Light 82% 0 50 100
82% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

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 19m2.
Based on this, your favourite maritime shop can tell you the quantity you need.

Rig
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
Jib sheet 8.8 m(29.0 feet)10 mm(3/8 inch)
Genoa sheet 8.8 m(29.0 feet)10 mm(3/8 inch)
Mainsheet 22.1 m(72.4 feet)10 mm(3/8 inch)
Spinnaker sheet19.4 m(63.7 feet)10 mm(3/8 inch)


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References