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Review of Finngulf 391


Basic specs.

sail specifications
The Finngulf 391 is a large sailboat designed by the Swedish maritime architect Håkan Södergren in the early eighties. Less than 100 boats have been produced.

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Hull
The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Rig
The boat 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.

Keel

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 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.


Engine

Finngulf 391 is typically equipped with an inboard Volvo Penta diesel engine.

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 Finngulf 391 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 391 is about 218 kg/cm, alternatively 1221 lbs/inch.
Meaning: if you load 218 kg cargo on the boat then it will sink 1 cm. Alternatively, 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 26,000 different boat types and 350,000 data points.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Finngulf 391 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. This comfort value is just below average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Finngulf 391 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 391 is 42%.

Low High 62% 0 50 100
This ballast ratio shows a righting moment that is higher than 62% 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 391 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 391 with ISO 8666 reference sail is 21.0, with a 135% genua the SA/D is 24.4.

Low High 85% 0 50 100
The SA/D ratio indicates that it is faster than 85% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 90% 0 50 100
The Finngulf 391 has more rig than 90% of all similar sailboats, which indicates that the boat is significantly overrigged.


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Finngulf 391 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.


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 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.


Rig

Dimensions of sail for fractional rig.

mainsail specifications headsail 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
Fractional rig
UsageLengthDiameter
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)
Fractional rig
UsageLengthDiameter
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)

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.



Finally

We are always looking for new photos. If you can contribute with photos for Finngulf 391 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