Review of Yankee 30

Yankee 30 anno 1971.

Basic specs.

The Yankee 30 aka Yankee 30 Mk I is a sailboat designed by the American maritime architect bureau Sparkman & Stephens in the early seventies. A few hundred boats have been produced. The Yankee 30 is built by the American yard Yankee Yachts 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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Interior

The boat is equipped with a galley and toilet facility.

Rig

The boat has more than one rig.

One option is 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 Yankee 30 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.

Yankee 30 can enter most marinas as the draft is just about 1.52 - 1.62 meter (4.99 - 5.29 ft) dependent on the load. See immersion rate below.

Engine

The boat is typically equipped with an inboard Universal Atomic 4 gasoline engine at 30.0 hp (22 kW), which gives a max speed about 6.6 knots.

The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive e.g. a sail drive.

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 Yankee 30 is 1.75, 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 Yankee 30 is about 128 kg/cm, alternatively 720 lbs/inch.
Meaning: if you load 128 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 720 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 Yankee 30 is 28.6.

Comparing this ratio with similar sailboats show that it is more comfortable than 79% 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 Yankee 30 is 3.34.

Compared with other similar sailboats it is slimmer than 73% 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 Yankee 30 is 319 which categorizes this boat among 'medium weight cruisers'.

21% 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 Yankee 30 with ISO 8666 reference sail is 17.3, with a 135% genua the SA/D is 20.8.

The SA/D ratio indicates that it is faster than 66% of all similar sailboat designs in light wind.

Over- / underrigged

The Yankee 30 has more rig than 54% of all similar sailboats, which indicates that the boat is slightly 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 22m² (236 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**
Masthead rig
Usage	Length		Diameter
Mainsail halyard	29.8 m	(97.8 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	29.8 m	(97.8 feet)	10 mm	(3/8 inch)
Spinnaker halyard	29.8 m	(97.8 feet)	10 mm	(3/8 inch)
Jib sheet	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Genoa sheet	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Mainsheet	22.9 m	(75.0 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.1 m	(66.0 feet)	12 mm	(1/2 inch)
Cunningham	3.1 m	(10.3 feet)	10 mm	(3/8 inch)
Kickingstrap	6.3 m	(20.6 feet)	10 mm	(3/8 inch)
Clew-outhaul	6.3 m	(20.6 feet)	10 mm	(3/8 inch)
Masthead rig
Usage	Length		Diameter
Mainsail halyard	27.9 m	(91.5 feet)	10 mm	(3/8 inch)
Jib/genoa halyard	27.9 m	(91.5 feet)	10 mm	(3/8 inch)
Spinnaker halyard	27.9 m	(91.5 feet)	10 mm	(3/8 inch)
Jib sheet	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Genoa sheet	9.1 m	(30.0 feet)	12 mm	(1/2 inch)
Mainsheet	22.9 m	(75.0 feet)	12 mm	(1/2 inch)
Spinnaker sheet	20.1 m	(66.0 feet)	12 mm	(1/2 inch)
Cunningham	3.0 m	(10.0 feet)	10 mm	(3/8 inch)
Kickingstrap	6.1 m	(20.0 feet)	10 mm	(3/8 inch)
Clew-outhaul	6.1 m	(20.0 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

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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.