Review of 606


Basic specs.

sail specifications
The 606 aka International 606 is a sailboat designed by the Swedish maritime architect Pelle Petterson.

Looking for a new boat? Find a 606 or similar boat for sale


The boat equipped with 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 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 0.95 - 1.05 meter (3.12 - 3.42 ft) dependent on the load.

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 606 is 2.37, indicating that this boat would not be accepted to participate in ocean races.

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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for 606 is 3.17.

Wide Slim 92% 0 50 100
Compared with other similar sailboats it is slimmer than 92% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for 606 is 48%.

Low High 86% 0 50 100
This ballast ratio shows a righting moment that is higher than 86% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for 606 with ISO 8666 reference sail is 24.2, with a 135% genua the SA/D is 27.0.

Low High 92% 0 50 100
The SA/D ratio indicates that it is faster than 92% of all similar sailboat designs in light wind.

Over- / underrigged

Low High 96% 0 50 100
The 606 has more rig than 96% 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 606 is 92

Slow Fast 92% 0 50 100
The relative speed performance is 92 which means that a it is faster than 92% of all similar sailboat designs.



Dimensions of sail for fractional rig.

mainsail 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 18.8 m(61.7 feet)6 mm(1/4 inch)
Jib/genoa halyard18.8 m(61.7 feet)6 mm(1/4 inch)
Spinnaker halyard18.8 m(61.7 feet)6 mm(1/4 inch)
Jib sheet 6.1 m(19.9 feet)8 mm(5/16 inch)
Genoa sheet6.1 m(19.9 feet)8 mm(5/16 inch)
Mainsheet 15.1 m(49.7 feet)8 mm(5/16 inch)
Spinnaker sheet13.3 m(43.7 feet)8 mm(5/16 inch)
Cunningham3.0 m(9.8 feet)6 mm(1/4 inch)
Kickingstrap6.0 m(19.7 feet)6 mm(1/4 inch)
Clew-outhaul6.0 m(19.7 feet)6 mm(1/4 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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


We are always looking for new photos. If you can contribute with photos for 606 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.