Review of Zorrina 25

Basic specs.

The Zorrina 25 is a small sailboat designed by the Swedish maritime architect Sven-Olof Ridder together with G. Ulfvengren in the early seventies. The Zorrina 25 is built by the Danish yard Metano A/S.

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Hull

Both the hull and the deck 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.

Interior

The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with 4 berths, a galley and 50.0 liter fresh water capacity.

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Keel

Swing keel

The Zorrina 25 is equipped with a swing keel. A swing keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.

Zorrina 25 can enter even shallow marinas as the draft is just about 1.38 - 1.48 meter (4.53 - 4.83 ft) dependent on the load. See immersion rate below.

Engine

The boat may be equipped with an inboard Volvo Penta 2002 diesel engine at 8 hp (5 kW). Calculated max speed is about 4.5 knots

The transmission is a saildrive.

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 Zorrina 25 is 2.01, 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 5.9 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 Zorrina 25 is about 99 kg/cm, alternatively 558 lbs/inch.
Meaning: if you load 99 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 558 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 Zorrina 25 is 18.9.

Comparing this ratio with similar sailboats show that it is more comfortable than 62% of all similar sailboat designs. This comfort value is just above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Zorrina 25 is 3.00.

Compared with other similar sailboats it is slimmer than 54% 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 Zorrina 25 is 35%.

This ballast ratio shows a righting moment that is higher than 31% 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 Zorrina 25 is 247 which categorizes this boat among 'light crusers & offshore racers'.

34% 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.

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 17m² (182 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	20.1 m	(65.8 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	20.1 m	(65.8 feet)	8 mm	(5/16 inch)
Spinnaker halyard	20.1 m	(65.8 feet)	8 mm	(5/16 inch)
Jib sheet	7.4 m	(24.4 feet)	10 mm	(3/8 inch)
Genoa sheet	7.4 m	(24.4 feet)	10 mm	(3/8 inch)
Mainsheet	18.6 m	(60.9 feet)	10 mm	(3/8 inch)
Spinnaker sheet	16.3 m	(53.6 feet)	10 mm	(3/8 inch)
Cunningham	2.5 m	(8.4 feet)	8 mm	(5/16 inch)
Kickingstrap	5.1 m	(16.7 feet)	8 mm	(5/16 inch)
Clew-outhaul	5.1 m	(16.7 feet)	8 mm	(5/16 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.

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Finally

We are always looking for new photos. If you can contribute with photos for Zorrina 25 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.