Review of Bianca 28

Bianca 28
Bianca 28 anno 1978. ´ Jens Schmuckstück in Heiligenhafen ´

Basic specs.

sail specifications
The Bianca 28 is a sailboat designed by the maritime architect bureau Elvstrøm & Kjærulff in the mid seventies. Several hundred boats have been produced. The Bianca 28 is built by the Danish yard Bianca Yacht I/S.

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

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.

Interior of Bianca 28 anno 1976. Denne båd er oprindelig en Bianca 26, der er ´opgraderet´ til en Bianca 28. Her ses, hvordan det originale bord er erstattet af et mere funktionelt bord med klapper.
The boat is equipped with 5 berths and a galley.
Galley of Bianca 28 anno 1976. Bemærk, hvordan vinduet er forstærket indvendigt ved midten af vinduet med en kraftig stålbøjle lodret fra ruffet og ned under vinduet. Antydningsvis ses også det udtrækkelige gasblus over styrbord køje/sofa.

Cockpit of Bianca 28 anno 1981.
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 Bianca 28.
The Bianca 28 is equipped with a long keel. A long 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 iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated. The boat can enter most marinas as the draft is just about 1.60 - 1.70 meter (5.25 - 5.55 ft) dependent on the load. See immersion rate below.

Bianca 28 is typically equipped with an inboard Yanmar diesel engine at 8.0 hp (5 kW), which gives a max speed about 4.2 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 Bianca 28 is 1.99, 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 6.0 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 Bianca 28 is about 106 kg/cm, alternatively 595 lbs/inch.
Meaning: if you load 106 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 595 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 Bianca 28 is 20.1.

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 Bianca 28 is 3.23.

Wide Slim 73% 0 50 100
Compared with other similar sailboats it is slimmer than 73% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.

Ballast Ratio
What is a Ballast Ratio?
The ballast ratio for Bianca 28 is 41%.

Low High 54% 0 50 100
This ballast ratio shows a righting moment that is higher than 54% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.

D/L (Displacement Length Ratio)
What is Displacement Length Ratio?
The DL-ratio for Bianca 28 is 282 which categorizes this boat among 'medium weight cruisers'.

Heavy Light 34% 0 50 100
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 Bianca 28 with ISO 8666 reference sail is 14.6, with a 135% genua the SA/D is 17.5.

Low High 34% 0 50 100
The SA/D ratio indicates that it is faster than 34% of all similar sailboat designs in light wind.

Over- / underrigged
Low High 50% 0 50 100
The Bianca 28 has more rig than 50% of all similar sailboats, which indicates that this rig is spot on average!

RSP (Relative Speed Performance)
What is Relative Speed Performance?
The Relative Speed Performance for Bianca 28 is 38

Slow Fast 38% 0 50 100
The relative speed performance is 38 which means that a it is faster than 38% of all similar sailboat designs.


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 19m2 (204 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.

Dimensions of sail for masthead rig.
mainsail specifications genoa specifications spinnaker 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
Mainsail halyard 22.3 m(73.2 feet)8 mm(5/16 inch)
Jib/genoa halyard22.3 m(73.2 feet)8 mm(5/16 inch)
Spinnaker halyard22.3 m(73.2 feet)8 mm(5/16 inch)
Jib sheet 8.4 m(27.6 feet)10 mm(3/8 inch)
Genoa sheet8.4 m(27.6 feet)10 mm(3/8 inch)
Mainsheet 21.0 m(68.9 feet)10 mm(3/8 inch)
Spinnaker sheet18.5 m(60.6 feet)10 mm(3/8 inch)
Cunningham2.6 m(8.7 feet)8 mm(5/16 inch)
Kickingstrap5.3 m(17.4 feet)8 mm(5/16 inch)
Clew-outhaul5.3 m(17.4 feet)8 mm(5/16 inch)

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