Review of Swan 651
Basic specs.
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The boat is equipped with 10-12 berths, a galley and toilet facility.
The Swan 651 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than 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.
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.
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.
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.
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.
What is L/B (Length Beam Ratio)?
The l/b ratio for Swan 651 is 3.77.
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
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.
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.
| Usage | Length | Diameter | ||
| Jib sheet | 20.0 m | (65.6 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 20.0 m | (65.6 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 50.0 m | (163.9 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 44.0 m | (144.2 feet) | 16 mm | (5/8 inch) |
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