Review of Finn 26

Finn 26
Finn 26 anno 1977.

Basic specs.

sail specifications
The Finn 26 is a sailboat designed by the maritime architect Eivind Still in the mid seventies. A few hundred boats have been produced. The Finn 26 is built by the Finnish yard Marin Form.

Looking for a new boat? Find a Finn 26 or similar boat for sale

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 of Finn 26.
The interior is like most other boats made of teak.
The boat is equipped with 5 berths, a galley and toilet facility.
Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

Finn 26 has more than one rig.

One option is a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

Another option is 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 Finn 26.
The Finn 26 is equipped with a finn keel. The finn keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.
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. As the surface of a finn type keel is just a fraction of the total wet surface, the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts. The boat can enter even shallow marinas as the draft is just about 1.40 - 1.50 meter (4.59 - 4.89 ft) dependent on the load. See immersion rate below.

The boat is typically equipped with an inboard engine.
The transmission is a saildrive.
The fuel tank which is made of stainless steel has a capacity of 50 liters (13 US gallons, 10 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 Finn 26 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 6.0 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 Finn 26 is about 116 kg/cm, alternatively 651 lbs/inch.
Meaning: if you load 116 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 651 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 Finn 26 is 16.7 - 19.1.

Low High 46% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 46% of all similar sailboat designs. This comfort value is just below average.

L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for Finn 26 is 2.88.

Slim Wide 69% 0 50 100
Compared with other similar sailboats it is more spacy than 69% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Ballast Ratio
What is a Ballast Ratio?
The ballast ratio for Finn 26 is 39%.

Low High 46% 0 50 100
This ballast ratio shows a righting moment that is higher than 46% 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 Finn 26 is 263 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 38% 0 50 100
38% 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 Finn 26 with ISO 8666 reference sail is 15.2, with a 135% genua the SA/D is 18.3.

Low High 38% 0 50 100
The SA/D ratio indicates that it is faster than 38% of all similar sailboat designs in light wind.

Over- / underrigged
Low High 73% 0 50 100
The Finn 26 has more rig than 73% of all similar sailboats, which indicates that the boat is slightly overrigged.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Finn 26 is 50

Slow Fast 50% 0 50 100
The relative speed performance is 50 which means that a it is faster than 50% 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 20m2 (215 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
Masthead rig
Mainsail halyard 22.6 m(74.0 feet)8 mm(5/16 inch)
Jib/genoa halyard22.6 m(74.0 feet)8 mm(5/16 inch)
Spinnaker halyard22.6 m(74.0 feet)8 mm(5/16 inch)
Jib sheet 8.1 m(26.5 feet)10 mm(3/8 inch)
Genoa sheet8.1 m(26.5 feet)10 mm(3/8 inch)
Mainsheet 20.2 m(66.2 feet)10 mm(3/8 inch)
Spinnaker sheet17.8 m(58.2 feet)10 mm(3/8 inch)
Cunningham2.6 m(8.5 feet)8 mm(5/16 inch)
Kickingstrap5.2 m(17.1 feet)8 mm(5/16 inch)
Clew-outhaul5.2 m(17.1 feet)8 mm(5/16 inch)
Fractional rig
Mainsail halyard 25.1 m(82.2 feet)8 mm(5/16 inch)
Jib/genoa halyard25.1 m(82.2 feet)8 mm(5/16 inch)
Spinnaker halyard25.1 m(82.2 feet)8 mm(5/16 inch)
Jib sheet 8.1 m(26.5 feet)10 mm(3/8 inch)
Genoa sheet8.1 m(26.5 feet)10 mm(3/8 inch)
Mainsheet 20.2 m(66.2 feet)10 mm(3/8 inch)
Spinnaker sheet17.8 m(58.2 feet)10 mm(3/8 inch)
Cunningham3.2 m(10.5 feet)8 mm(5/16 inch)
Kickingstrap6.4 m(21.0 feet)8 mm(5/16 inch)
Clew-outhaul6.4 m(21.0 feet)8 mm(5/16 inch)

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