Review of Sinkro 85

Basic specs.

The Sinkro 85 is a sailboat designed by the maritime architect Åge Sintron.

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Rig

The boat equipped with 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

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 1.55 - 1.65 meter (5.09 - 5.39 ft) dependent on the load. See immersion rate below.

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 Sinkro 85 is 2.04, indicating that this boat would not be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Sinkro 85 is about 170 kg/cm, alternatively 956 lbs/inch.
Meaning: if you load 170 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 956 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Sinkro 85 is 2.83.

Compared with other similar sailboats it is more spacy than 76% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Sinkro 85 is 43%.

This ballast ratio shows a righting moment that is higher than 66% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Sinkro 85 with ISO 8666 reference sail is 16.5, with a 135% genua the SA/D is 19.7.

The SA/D ratio indicates that it is faster than 58% of all similar sailboat designs in light wind.

Over- / underrigged

The Sinkro 85 has more rig than 54% 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 Sinkro 85 is 50

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

Maintenance

Rig

Dimensions of sail for masthead rig.

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**
Usage	Length		Diameter
Mainsail halyard	28.3 m	(92.8 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	28.3 m	(92.8 feet)	8 mm	(5/16 inch)
Spinnaker halyard	28.3 m	(92.8 feet)	8 mm	(5/16 inch)
Jib sheet	8.5 m	(27.9 feet)	10 mm	(3/8 inch)
Genoa sheet	8.5 m	(27.9 feet)	10 mm	(3/8 inch)
Mainsheet	21.2 m	(69.7 feet)	10 mm	(3/8 inch)
Spinnaker sheet	18.7 m	(61.4 feet)	10 mm	(3/8 inch)
Cunningham	3.0 m	(9.8 feet)	8 mm	(5/16 inch)
Kickingstrap	6.0 m	(19.7 feet)	8 mm	(5/16 inch)
Clew-outhaul	6.0 m	(19.7 feet)	8 mm	(5/16 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 Sinkro 85 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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.