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Review of Swan 651


Basic specs.

sail specifications
The Swan 651 is a large sailboat designed by the Argentine maritime architect Germán Frers in the early eighties. The Swan 651 is built by the Finnish yard OY Nautor AB.

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

Interior
The interior is like most other boats made of teak.
The boat is equipped with 10-12 berths, a galley and toilet facility.

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 Swan 651 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 only enter major marinas as the draft is about 3.50 - 3.60 meter (11.48 - 11.78 ft) dependent on the load. See immersion rate below.


Engine

Swan 651 is typically equipped with an inboard Perkins diesel engine at 120.0 hp (89 kW), which gives a max speed about 7.0 knots.

The fuel tank which is made of stainless steel has a capacity of 2000.0 liters (528 US gallons, 439 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 Swan 651 is 1.65, 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 9.9 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 651 is about 596 kg/cm, alternatively 3340 lbs/inch.
Meaning: if you load 596 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 3340 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 651 is 3.77.


SA/D (Sail Area Displacement ratio)

SA/D (Sail Area Displacement ratio)
Indicates how fast the boat is in light wind:
- Cruising Boats have ratios 10-15
- Cruiser-Racers have ratios 16-20
- Racers have ratios above 20
- High-Performance Racers have ratios above 24
Sail-area/displacement ratio (SA/D ratio): 15.50


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

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 111m2 (1194 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

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
Jib sheet 20.0 m(65.6 feet)16 mm(5/8 inch)
Genoa sheet20.0 m(65.6 feet)16 mm(5/8 inch)
Mainsheet 50.0 m(163.9 feet)16 mm(5/8 inch)
Spinnaker sheet44.0 m(144.2 feet)16 mm(5/8 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 Swan 651 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