The American 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 boat can only enter major marinas as the draft is about 10.67 - 10.77 meter (35.01 - 35.31 ft) dependent on the load. See immersion rate below.
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 American 30 is 2.13, 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 6.9 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 American 30 is about 175 kg/cm, alternatively 985 lbs/inch.
Meaning: if you load 175 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 985 lbs cargo on the boat it will sink 1 inch.
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 American 30 is 19.1.
What is L/B (Length Beam Ratio)?
The l/b ratio for American 30 is 2.81.
The ballast ratio for American 30 is 37%.
What is Displacement Length Ratio?
The DL-ratio for American 30 is 191 which categorizes this boat among '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): 17.00
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 84m2 (904 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 | 9.1 m | (29.9 feet) | 12 mm | (1/2 inch) |
Genoa sheet | 9.1 m | (29.9 feet) | 12 mm | (1/2 inch) |
Mainsheet | 22.8 m | (74.8 feet) | 12 mm | (1/2 inch) |
Spinnaker sheet | 20.1 m | (65.8 feet) | 12 mm | (1/2 inch) |
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