Review of Cumulus 28

Basic specs.

The Cumulus 28 is a sailboat designed by the Swedish maritime architect Peter Norlin in the late seventies. Several hundred boats have been produced. The Cumulus 28 is built by the Swedish yard Albin Marin AB.

Here we would have liked to show you nice photos of the Cumulus 28.
If you have a photo you would like to share: Upload Image

Looking for a new boat? Find a Cumulus 28 or similar boat for sale

Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Rig

The Cumulus 28 is 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 gennaker or a spinnaker for optimal speed.

Keel

Fin keel

The Cumulus 28 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 boat can enter most marinas as the draft is just about 1.62 - 1.72 meter (5.31 - 5.61 ft) dependent on the load. See immersion rate below.

Engine

The boat may be equipped with an inboard Yanmar diesel engine at 12 hp (8 kW). Calculated max speed is about 4.6 knots

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 Cumulus 28 is 1.93, 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 6.3 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 Cumulus 28 is about 128 kg/cm, alternatively 720 lbs/inch.
Meaning: if you load 128 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 720 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 Cumulus 28 is 3.04.

Compared with other similar sailboats it is more spacy than 54% of all other designs. It seems that the designer has chosen a slightly more spacy hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Cumulus 28 is 40%.

This ballast ratio shows a righting moment that is higher than 50% of all similar sailboat designs. This righting moment (ability to resist heeling) is spot on average!

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Cumulus 28 is 282 which categorizes this boat among 'medium weight cruisers'.

34% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Cumulus 28 with ISO 8666 reference sail is 15.8, with a 135% genua the SA/D is 18.7.

The SA/D ratio indicates that it is faster than 46% of all similar sailboat designs in light wind.

Over- / underrigged

The Cumulus 28 has more rig than 54% of all similar sailboats, which indicates that the boat is slightly overrigged.

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 23m² (247 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	28.1 m	(92.0 feet)	8 mm	(5/16 inch)
Jib/genoa halyard	28.1 m	(92.0 feet)	8 mm	(5/16 inch)
Spinnaker halyard	28.1 m	(92.0 feet)	8 mm	(5/16 inch)
Jib sheet	8.6 m	(28.1 feet)	10 mm	(3/8 inch)
Genoa sheet	8.6 m	(28.1 feet)	10 mm	(3/8 inch)
Mainsheet	21.4 m	(70.2 feet)	10 mm	(3/8 inch)
Spinnaker sheet	18.8 m	(61.8 feet)	10 mm	(3/8 inch)
Cunningham	3.0 m	(9.8 feet)	8 mm	(5/16 inch)
Kickingstrap	6.0 m	(19.7 feet)	8 mm	(5/16 inch)
Clew-outhaul	6.0 m	(19.7 feet)	8 mm	(5/16 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 Cumulus 28 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.