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Review of Swan 65 Ketch


Basic specs.

sail specifications
The Swan 65 Ketch is a large sailboat designed by the American maritime architect bureau Sparkman & Stephens in the early seventies. 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 equipped with a ketch rig.

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 Swan 65 Ketch is 1.58, 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 9.2 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 Swan 65 Ketch is about 476 kg/cm, alternatively 2666 lbs/inch.
Meaning: if you load 476 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2666 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 Swan 65 Ketch is 3.97.


SA/D (Sail Area Displacement ratio)

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

The SA/D for Swan 65 Ketch with ISO 8666 reference sail is 14.4, with a 135% genua the SA/D is 17.4.


Sorry, we do not have sufficient statistical information available for this boat to provide a significant reliable analysis.

Maintenance

Rig

Dimensions of sail for ketch rig.

mainsail specifications headsail specifications

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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
UsageLengthDiameter
Mainsail halyard 52.9 m(173.6 feet)14 mm(0.55 inch)
Jib/genoa halyard52.9 m(173.6 feet)14 mm(0.55 inch)
Spinnaker halyard52.9 m(173.6 feet)14 mm(0.55 inch)
Jib sheet 19.7 m(64.6 feet)16 mm(5/8 inch)
Genoa sheet19.7 m(64.6 feet)16 mm(5/8 inch)
Mainsheet 49.2 m(161.4 feet)16 mm(5/8 inch)
Spinnaker sheet43.3 m(142.0 feet)16 mm(5/8 inch)
Cunningham5.6 m(18.3 feet)14 mm(0.55 inch)
Kickingstrap11.2 m(36.6 feet)14 mm(0.55 inch)
Clew-outhaul11.2 m(36.6 feet)14 mm(0.55 inch)

Boat owner's ideas

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

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Finally

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If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.



References