Review of Sydney 46
Basic specs.
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The Sydney 46 is 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.
Fin keel
The Sydney 46 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 full 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 2.88 - 2.98 meter (9.45 - 9.75 ft) dependent on the load. See immersion rate below.
The boat may be equipped with an inboard Yanmar 3JH diesel engine at 48 hp (35 kW). Calculated max speed is about 7.4 knots
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 Sydney 46 is 2.05, indicating that this boat would not 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 8.3 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 Sydney 46 is about 318 kg/cm, alternatively 1781 lbs/inch.
Meaning: if you load 318 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1781 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 Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Sydney 46 is 21.6.
What is L/B (Length Beam Ratio)?
The l/b ratio for Sydney 46 is 3.46.
What is Displacement Length Ratio?
The DL-ratio for Sydney 46 is 148 which categorizes this boat among 'ultra light racers'.
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): 26.14
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 61m2 (656 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 | 14.2 m | (46.6 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 14.2 m | (46.6 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 35.5 m | (116.5 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 31.2 m | (102.5 feet) | 16 mm | (5/8 inch) |
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