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Review of Portsmouth 48


Basic specs.

sail specifications
The Portsmouth 48 is a large sailboat designed by the American maritime architect Ted Hood in the early 2000. The Portsmouth 48 is built by Portsmouth Marine.

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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.


Interior

The boat is equipped with 1192.0 liter fresh water capacity.


Rig

The Portsmouth 48 is 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

Full keel

The Portsmouth 48 is equipped with a long keel. A full 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 most marinas as the draft is just about 1.78 - 1.88 meter (5.84 - 6.14 ft) dependent on the load. See immersion rate below.


Engine

Portsmouth 48 may be equipped with an inboard Yanmar diesel engine at 315 hp (234 kW). Calculated max speed is about 14.7 knots

The fuel tank has a capacity of 2157.0 liters (569 US gallons, 474 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 Portsmouth 48 is 1.84, 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 8.8 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 Portsmouth 48 is about 405 kg/cm, alternatively 2268 lbs/inch.
Meaning: if you load 405 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2268 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 Portsmouth 48 is 32.4.

Low High 42% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 42% of all similar sailboat designs. This comfort value is just below average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Portsmouth 48 is 3.23.

Slim Wide 76% 0 50 100
Compared with other similar sailboats it is more spacy than 76% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Portsmouth 48 is 29%.

Low High 18% 0 50 100
This ballast ratio shows a righting moment that is higher than 18% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Portsmouth 48 is 190 which categorizes this boat among 'light racers'.

Heavy Light 69% 0 50 100
69% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.


SA/D (Sail Area Displacement ratio)

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

The SA/D for Portsmouth 48 with ISO 8666 reference sail is 15.8, with a 135% genua the SA/D is 18.8.

Low High 12% 0 50 100
The SA/D ratio indicates that it is faster than 12% of all similar sailboat designs in light wind.


Over- / underrigged


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 63m2 (678 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.

mainsail specifications headsail specifications

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
UsageLengthDiameter
Mainsail halyard 40.0 m(131.2 feet)14 mm(0.55 inch)
Jib/genoa halyard40.0 m(131.2 feet)14 mm(0.55 inch)
Spinnaker halyard40.0 m(131.2 feet)14 mm(0.55 inch)
Jib sheet 14.8 m(48.4 feet)16 mm(5/8 inch)
Genoa sheet14.8 m(48.4 feet)16 mm(5/8 inch)
Mainsheet 36.9 m(121.1 feet)16 mm(5/8 inch)
Spinnaker sheet32.5 m(106.5 feet)16 mm(5/8 inch)
Cunningham5.8 m(19.0 feet)14 mm(0.55 inch)
Kickingstrap11.6 m(38.0 feet)14 mm(0.55 inch)
Clew-outhaul11.6 m(38.0 feet)14 mm(0.55 inch)

Boat owner's ideas

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.



Finally

We are always looking for new photos. If you can contribute with photos for Portsmouth 48 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