Review of O'Day 20

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.

CentreBoard

The O'Day 20 is equipped with a centreboard keel. A centreboard keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can sail close to the beach as the draft is just 0.34 - 0.44 meter (1.12 - 1.42 ft) dependent of the load. See immersion rate below.

The O'Day 20 has been equipped with different engine alternatives.

Alternative 1:

An outboard motor is often used on this boat. In that case the boat will typically require a power of 1 - 2 hp, alternatively 32 - 38 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.

Alternative 2:

An outboard motor is often used on this boat. In that case O'Day 20 will typically require a power of 1 - 2 hp, alternatively 32 - 38 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.

What is Capsize Screening Formula (CSF)?

The capsize screening value for O'Day 20 is 2.39, indicating that this boat would not be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 5.6 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.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for O'Day 20 is about 75 kg/cm, alternatively 421 lbs/inch.
Meaning: if you load 75 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 421 lbs cargo on the boat it will sink 1 inch.

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for O'Day 20 is 10.3.

What is L/B (Length Beam Ratio)?

The l/b ratio for O'Day 20 is 2.80.

What is Displacement Length Ratio?

The DL-ratio for O'Day 20 is 138 which categorizes this boat among 'ultra light racers'.

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

The SA/D for O'Day 20 with ISO 8666 reference sail is 20.5, with a 135% genua the SA/D is 24.3.

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 14m² (150 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.

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.

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.

We are always looking for new photos. If you can contribute with photos for O'Day 20 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.