Review of Finngulf 39

Finngulf 39
Finngulf 39 anno 1989.

Basic specs.

boat specifications
The Finngulf 39 is a large sailboat designed by the Swedish maritime architect Håkan Södergren in the early eighties. The Finngulf 39 is built by the Finnish yard Finngulf Marine.

Looking for a new boat? Find a Finngulf 39 or similar boat for sale

Both the hull and the deck is made of hand laid fibreglass. Generally, a hull made of hand laid fibreglass requires only a minimum of maintenance during the sailing season.
The hull is a double hull which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.
The deck is a double deck which improves the indoor climate.

The interior is like most other boats made of teak.
The boat is equipped with 3 cabins, 6-7 berths, a galley and toilet facility.

The boat has 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.

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 keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allow a minor keel and hence less water resistance and higher speed. Finngulf 39 can only enter major marinas as the draft is about 1.95 - 2.05 meter (6.40 - 6.70 ft) dependent on the load. See immersion rate below.

The boat is typical equipped with an inboard Volvo Penta 2003 engine at 23.0 hp (17 kW), which gives a max speed about 5.2 knots.
The transmission is a saildrive.
The fuel tank which is made of stainless steel has a capacity of 82 liters (21 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 Finngulf 39 is 1.91, 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 7.4 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 Finngulf 39 is about 218 kg/cm, alternative 1221 lbs/inch.
Meaning: if you load 218 kg cargo on the boat then it will sink 1 cm. Alternative, if you load 1221 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 Finngulf 39 is 25.5.

Low High 31% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 31% of all similar sailboat designs. A comfort value is just below average.

L/B (Length Beam Ratio)
What is L/B (Length Beam Ratio)?
The l/b ratio for Finngulf 39 is 3.38.

Wide Slim 58% 0 50 100
Compared with other similar sailboats it is slimmer than 58% 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 Finngulf 39 is 43%.

Low High 69% 0 50 100
This ballast ratio shows a righting moment that is higher than 69% 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 Finngulf 39 is 232 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 58% 0 50 100
58% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.

SA/D (Sail Area Displacement ratio)
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Finngulf 39 with ISO 8666 reference sail is 19.8, with a 135% genua the SA/D is 22.8.

Low High 76% 0 50 100
The SA/D ratio indicates that it is faster than 76% of all similar sailboat designs in light wind.

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Finngulf 39 is 69

Slow Fast 69% 0 50 100
The relative speed performance is 69 which means that a it is faster than 69% 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 38m2 (409 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 fractional 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 40.0 m(131.4 feet)12 mm(1/2 inch)
Jib/genoa halyard40.0 m(131.4 feet)12 mm(1/2 inch)
Spinnaker halyard40.0 m(131.4 feet)12 mm(1/2 inch)
Jib sheet 12.0 m(39.3 feet)14 mm(0.55 inch)
Genoa sheet12.0 m(39.3 feet)14 mm(0.55 inch)
Mainsheet 29.9 m(98.2 feet)14 mm(0.55 inch)
Spinnaker sheet26.3 m(86.4 feet)14 mm(0.55 inch)
Cunningham5.0 m(16.4 feet)12 mm(1/2 inch)
Kickingstrap10.0 m(32.8 feet)12 mm(1/2 inch)
Clew-outhaul10.0 m(32.8 feet)12 mm(1/2 inch)

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