Review of Allegro 33.1

Allegro 33.1
Allegro 33.1 anno 1982.

Basic specs.

sail specifications
The Allegro 33.1 is a sailboat designed by the Swedish maritime architect Lars Olof Norlin. The Allegro 33.1 is built by the Swedish yard Allegro Båt AB.

Looking for a new boat? Find a Allegro 33.1 or similar boat for sale


The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with 6 berths.

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.


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 of Allegro 33.1. This photo is of an Allegro 33 but the hull is the same.


Allegro 33.1 is typically equipped with an engine.

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 Allegro 33.1 is 1.89, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Allegro 33.1 is about 218 kg/cm, alternatively 1225 lbs/inch.
Meaning: if you load 218 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1225 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Allegro 33.1 is 2.95.

Slim Wide 73% 0 50 100
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.

SA/D (Sail Area Displacement ratio)

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): 19.02



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
Jib sheet 9.8 m(32.2 feet)12 mm(1/2 inch)
Genoa sheet9.8 m(32.2 feet)12 mm(1/2 inch)
Mainsheet 24.5 m(80.5 feet)12 mm(1/2 inch)
Spinnaker sheet21.6 m(70.8 feet)12 mm(1/2 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.


We are always looking for new photos. If you can contribute with photos for Allegro 33.1 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.