Review of Compis 363

Basic specs.

The Compis 363 is a sailboat designed by the Swedish maritime architect Bernt Andersson in the early eighties. Only a few boats have been produced. The Compis 363 is built by the Swedish yard Compisbåtar.

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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 interior is like most other boats made of teak. Teak has the advantage of being naturally very oily and therefore water-repellent, which is suitable on boats.
The boat is equipped with 7 berths, a galley and toilet facility.

Rig

The boat equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a genaker or a spinnaker for optimal speed.

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 most marinas as the draft is just about 1.76 - 1.86 meter (5.77 - 6.07 ft) dependent on the load. See immersion rate below.

Engine

Compis 363 is typically equipped with an inboard Yanmar 2GM diesel engine at 15.0 hp (11 kW), which gives a max speed about 4.8 knots.

The fuel tank has a capacity of 20 liters (5 US gallons, 4 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 Compis 363 is 1.89, 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 7.5 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 Compis 363 is about 204 kg/cm, alternatively 1147 lbs/inch.
Meaning: if you load 204 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1147 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 Compis 363 is 22.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 24% of all similar sailboat designs. This is a comfort value significantly below average.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Compis 363 is 3.43.

Compared with other similar sailboats it is slimmer than 76% of all other designs. It seems that the designer has chosen a significantly more speedy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Compis 363 is 48%.

This ballast ratio shows a righting moment that is higher than 88% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Compis 363 is 165 which categorizes this boat among 'light racers'.

85% 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 Compis 363 with ISO 8666 reference sail is 19.4, with a 135% genua the SA/D is 22.1.

The SA/D ratio indicates that it is faster than 79% of all similar sailboat designs in light wind.

Over- / underrigged

The Compis 363 has more rig than 66% of all similar sailboats, which indicates that the boat is slightly overrigged.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Compis 363 is 79

The relative speed performance is 79 which means that a it is faster than 79% of all similar sailboat designs.

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 35m² (376 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 fractional 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**
Usage	Length		Diameter
Mainsail halyard	35.4 m	(116.2 feet)	12 mm	(1/2 inch)
Jib/genoa halyard	35.4 m	(116.2 feet)	12 mm	(1/2 inch)
Spinnaker halyard	35.4 m	(116.2 feet)	12 mm	(1/2 inch)
Jib sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Genoa sheet	11.1 m	(36.3 feet)	14 mm	(0.55 inch)
Mainsheet	27.6 m	(90.6 feet)	14 mm	(0.55 inch)
Spinnaker sheet	24.3 m	(79.8 feet)	14 mm	(0.55 inch)
Cunningham	4.9 m	(16.1 feet)	12 mm	(1/2 inch)
Kickingstrap	9.8 m	(32.2 feet)	12 mm	(1/2 inch)
Clew-outhaul	9.8 m	(32.2 feet)	12 mm	(1/2 inch)

Boat owner's ideas

This section is reserved boat owner's changes, 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 Compis 363 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

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.