Review of Arietta

Arietta anno 1974. 1974 build wooden Arietta named s/y Marietta, owner Mika Pirinen, located in Rauma, Finland.

Basic specs.

boat specifications
The Arietta is a sailboat designed by the maritime architect Olle Enderlein in the mid sixties. A few hundred boats have been produced. The Arietta is built by the Swedish yard Malö Yachts AB.

Looking for a new boat? Find a Arietta or similar boat for sale

The hull is made of hand laid fibreglass. Generally, a hull made of hand laid 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.

The interior is like most other boats made of teak.
The boat is equipped with 4 berths, a galley and toilet facility.
The headroom is above average

The boat has 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 of Arietta anno 1973. Arietta 31
The boat has a long keel which means better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space. The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated. The boat can enter even shallow marinas as the draft is just about 1.35 - 1.45 meter (4.43 - 4.73 ft) dependent on the load. See immersion rate below.

The boat is typical equipped with an inboard Yanmar diesel engine at 12.0 hp (8 kW), which gives a max speed about 4.3 knots.
The fuel tank has a capacity of 60 liters (15 US 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 Arietta 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 6.3 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 Arietta is about 121 kg/cm, alternative 678 lbs/inch.
Meaning: if you load 121 kg cargo on the boat then it will sink 1 cm. Alternative, if you load 678 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.

Motion Comfort Ratio
What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Arietta is 26.3.

Low High 66% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 66% of all similar sailboat designs. A comfort value is just above average.

L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for Arietta is 3.48.

Wide Slim 82% 0 50 100
Compared with other similar sailboats it is slimmer than 82% of all other designs. It seems that the designer has chosen a significantly more speedy hull design.

Ballast Ratio
What is a Ballast Ratio?
The ballast ratio for Arietta is 45%.

Low High 73% 0 50 100
This ballast ratio shows a righting moment that is higher than 73% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for Arietta is 324 which categorizes this boat among 'medium weight cruisers'.

Heavy Light 21% 0 50 100
21% 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 Arietta with ISO 8666 reference sail is 15.1, with a 135% genua the SA/D is 17.8.

Low High 34% 0 50 100
The SA/D ratio indicates that it is faster than 34% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Arietta is 7

Slow Fast 7% 0 50 100
The relative speed performance is 7 which means that a it is faster than 7% of all similar sailboat designs.


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 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 for masthead rig.
mainsail specifications genoa specifications spinnaker 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
Mainsail halyard 25.0 m(82.2 feet)10 mm(3/8 inch)
Jib/genoa halyard25.0 m(82.2 feet)10 mm(3/8 inch)
Spinnaker halyard25.0 m(82.2 feet)10 mm(3/8 inch)
Jib sheet 9.4 m(30.8 feet)12 mm(1/2 inch)
Genoa sheet9.4 m(30.8 feet)12 mm(1/2 inch)
Mainsheet 23.5 m(77.1 feet)12 mm(1/2 inch)
Spinnaker sheet20.7 m(67.8 feet)12 mm(1/2 inch)
Cunningham3.5 m(11.5 feet)10 mm(3/8 inch)
Kickingstrap7.0 m(23.0 feet)10 mm(3/8 inch)
Clew-outhaul7.0 m(23.0 feet)10 mm(3/8 inch)

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