Review of Swiftsure 33

Swiftsure 33 anno 1963. bilden tagen 2003 i Misterhults skärgård

Basic specs.

The Swiftsure 33 is a sailboat designed by the American maritime architect Philip L. Rhodes in the late fifties. A few hundred boats have been produced. The Swiftsure 33 is built by De Vries Lentch, Inc..

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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 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.

Engine

The boat is typically equipped with a Universal Atomic 4 gasoline engine at 30.0 hp (22 kW), which gives a max speed about 5.7 knots.

The fuel tank has a capacity of 106 liters (28 US gallons, 23 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 Swiftsure 33 is 1.77, 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 6.4 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 Swiftsure 33 is about 142 kg/cm, alternatively 799 lbs/inch.
Meaning: if you load 142 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 799 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Swiftsure 33 is 31.6.

Comparing this ratio with similar sailboats show that it is more comfortable than 85% of all similar sailboat designs. This is a comfort value significantly above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Swiftsure 33 is 3.30.

Compared with other similar sailboats it is slimmer than 58% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Swiftsure 33 is 425 which categorizes this boat among 'heavy cruisers'.

2% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Swiftsure 33 with ISO 8666 reference sail is 15.7, with a 135% genua the SA/D is 18.4.

The SA/D ratio indicates that it is faster than 34% of all similar sailboat designs in light wind.

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	27.4 m	(89.7 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	27.4 m	(89.7 feet)	10 mm	(3/8 inch)
Spinnaker halyard	27.4 m	(89.7 feet)	10 mm	(3/8 inch)
Jib sheet	10.1 m	(33.1 feet)	12 mm	(1/2 inch)
Genoa sheet	10.1 m	(33.1 feet)	12 mm	(1/2 inch)
Mainsheet	25.2 m	(82.7 feet)	12 mm	(1/2 inch)
Spinnaker sheet	22.2 m	(72.8 feet)	12 mm	(1/2 inch)
Cunningham	4.5 m	(14.7 feet)	10 mm	(3/8 inch)
Kickingstrap	9.0 m	(29.4 feet)	10 mm	(3/8 inch)
Clew-outhaul	9.0 m	(29.4 feet)	10 mm	(3/8 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 Swiftsure 33 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.