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Review of Finngulf 33


Finngulf 33
Finngulf 33 anno 1989.

Basic specs.

sail specifications
The Finngulf 33 aka Inferno 33 is a sailboat designed by the Swedish maritime architect Håkan Södergren in the late eighties. The Finngulf 33 is built by the Finnish yard Finngulf Marine.

Looking for a new boat? Find a Finngulf 33 or similar boat for sale

Hull
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.

Interior
The interior is like most other boats made of teak.
The boat is equipped with 3 cabins, 6 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.

Rig
Finngulf 33 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 Finngulf 33 is equipped with a fin keel. A boat with a fin keel 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 allows a smaller keel and hence less water resistance and higher speed.

The boat can enter most marinas as the draft is just about 1.75 - 1.85 meter (5.74 - 6.04 ft) dependent on the load. See immersion rate below.


Engine

The boat is typically equipped with an inboard Volvo Penta 2002 diesel engine at 18.0 hp (13 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 50.0 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 Finngulf 33 is 1.88, 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 7.0 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 Finngulf 33 is about 169 kg/cm, alternatively 947 lbs/inch.
Meaning: if you load 169 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 947 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 33 is 24.3.

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 Finngulf 33 is 3.26.

Wide Slim 54% 0 50 100
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 Finngulf 33 is 48%.

Low High 82% 0 50 100
This ballast ratio shows a righting moment that is higher than 82% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Finngulf 33 is 227 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 33 with ISO 8666 reference sail is 20.1, with a 135% genua the SA/D is 23.1.

Low High 90% 0 50 100
The SA/D ratio indicates that it is faster than 90% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 62% 0 50 100
The Finngulf 33 has more rig than 62% 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 Finngulf 33 is 88

Slow Fast 88% 0 50 100
The relative speed performance is 88 which means that a it is faster than 88% 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 30m2 (322 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 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 35.3 m(115.8 feet)10 mm(3/8 inch)
Jib/genoa halyard35.3 m(115.8 feet)10 mm(3/8 inch)
Spinnaker halyard35.3 m(115.8 feet)10 mm(3/8 inch)
Jib sheet 10.1 m(33.0 feet)12 mm(1/2 inch)
Genoa sheet10.1 m(33.0 feet)12 mm(1/2 inch)
Mainsheet 25.1 m(82.4 feet)12 mm(1/2 inch)
Spinnaker sheet22.1 m(72.5 feet)12 mm(1/2 inch)
Cunningham4.5 m(14.8 feet)10 mm(3/8 inch)
Kickingstrap9.0 m(29.5 feet)10 mm(3/8 inch)
Clew-outhaul9.0 m(29.5 feet)10 mm(3/8 inch)
Fractional rig
UsageLengthDiameter
Mainsail halyard 35.3 m(115.8 feet)10 mm(3/8 inch)
Jib/genoa halyard35.3 m(115.8 feet)10 mm(3/8 inch)
Spinnaker halyard35.3 m(115.8 feet)10 mm(3/8 inch)
Jib sheet 10.1 m(33.0 feet)12 mm(1/2 inch)
Genoa sheet10.1 m(33.0 feet)12 mm(1/2 inch)
Mainsheet 25.1 m(82.4 feet)12 mm(1/2 inch)
Spinnaker sheet22.1 m(72.5 feet)12 mm(1/2 inch)
Cunningham4.5 m(14.8 feet)10 mm(3/8 inch)
Kickingstrap9.0 m(29.5 feet)10 mm(3/8 inch)
Clew-outhaul9.0 m(29.5 feet)10 mm(3/8 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 33 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