Review of Cape Dory 30 Mk II

Basic specs.

The Cape Dory 30 Mk II is a sailboat designed by the maritime architect Clive M. Dent in the late eighties. Less than 100 boats have been produced. The Cape Dory 30 Mk II is built by the American yard Cape Dory Yachts.

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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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

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 Cape Dory 30 Mk II is equipped with a long keel. A long keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.

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 enter even shallow marinas as the draft is just about 1.37 - 1.47 meter (4.49 - 4.79 ft) dependent on the load. See immersion rate below.

Engine

The boat is typically equipped with a Westerbeke 21A diesel engine at 23.0 hp (17 kW), which gives a max speed about 5.4 knots.

The fuel tank has a capacity of 76.0 liters (20 US gallons, 16 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 Cape Dory 30 Mk II is 1.91, 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 6.6 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 Cape Dory 30 Mk II is about 158 kg/cm, alternatively 884 lbs/inch.
Meaning: if you load 158 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 884 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 Cape Dory 30 Mk II is 27.3.

Comparing this ratio with similar sailboats show that it is more comfortable than 73% of all similar sailboat designs. This comfort value is just above average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Cape Dory 30 Mk II is 2.91.

Compared with other similar sailboats it is more spacy than 73% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Cape Dory 30 Mk II is 39%.

This ballast ratio shows a righting moment that is higher than 38% of all similar sailboat designs. A righting moment (ability to resist heeling) just below average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Cape Dory 30 Mk II is 335 which categorizes this boat among 'heavy cruisers'.

15% 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 Cape Dory 30 Mk II with ISO 8666 reference sail is 16.2, with a 135% genua the SA/D is 19.4.

The SA/D ratio indicates that it is faster than 50% of all similar sailboat designs in light wind.

Over- / underrigged

The Cape Dory 30 Mk II has more rig than 76% of all similar sailboats, which indicates that the boat is significantly overrigged.

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 17m² (182 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

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	28.0 m	(91.9 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	28.0 m	(91.9 feet)	10 mm	(3/8 inch)
Spinnaker halyard	28.0 m	(91.9 feet)	10 mm	(3/8 inch)
Jib sheet	9.3 m	(30.5 feet)	12 mm	(1/2 inch)
Genoa sheet	9.3 m	(30.5 feet)	12 mm	(1/2 inch)
Mainsheet	23.2 m	(76.3 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.5 m	(67.1 feet)	12 mm	(1/2 inch)
Cunningham	3.7 m	(12.2 feet)	10 mm	(3/8 inch)
Kickingstrap	7.5 m	(24.5 feet)	10 mm	(3/8 inch)
Clew-outhaul	7.5 m	(24.5 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.

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Finally

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References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.