The hull is made of wood.
Some boats has a hull made of Fibreglass.
The boat is equipped with 227.0 liter fresh water capacity.
Fin keel
The Herreshoff 31 Cat ketch 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 enter even shallow marinas as the draft is just about 1.22 - 1.32 meter (4.00 - 4.30 ft) dependent on the load. See immersion rate below.
The Herreshoff 31 Cat ketch has been equipped with different engine alternatives.
Alternative 1:
Herreshoff 31 Cat ketch may be equipped with an inboard Yanmar diesel engine
Alternative 2:
The boat may be equipped with an inboard Nanni diesel engine
The fuel tank has a capacity of 70.0 liters (18 US gallons, 15 imperial gallons).
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 Herreshoff 31 Cat ketch is 2.11, 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 7.1 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 Herreshoff 31 Cat ketch is about 180 kg/cm, alternatively 1008 lbs/inch.
Meaning: if you load 180 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1008 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 Herreshoff 31 Cat ketch is 17.9.
What is L/B (Length Beam Ratio)?
The l/b ratio for Herreshoff 31 Cat ketch is 2.98.
The ballast ratio for Herreshoff 31 Cat ketch is 44%.
What is Displacement Length Ratio?
The DL-ratio for Herreshoff 31 Cat ketch is 154 which categorizes this boat among 'light racers'.
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 28m2 (301 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 | 9.4 m | (30.8 feet) | 12 mm | (1/2 inch) |
Genoa sheet | 9.4 m | (30.8 feet) | 12 mm | (1/2 inch) |
Mainsheet | 23.5 m | (77.1 feet) | 12 mm | (1/2 inch) |
Spinnaker sheet | 20.7 m | (67.8 feet) | 12 mm | (1/2 inch) |
This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.
Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.
We are always looking for new photos. If you can contribute with photos for Herreshoff 31 Cat ketch 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.