Bianca 420.

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Hull

The hull is made of hand laid fibreglass while the deck is made of fibreglass. Generally, a hull made of hand laid fibreglass requires only a minimum of maintenance during the sailing season.

The hull is a double hull which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.

The deck is a double deck which improves the indoor climate.

The hull is a double hull which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.

The deck is a double deck which improves the indoor climate.

Interior

The interior is like many other boats made of mahogany.

The boat is equipped with 3 cabins, 6-8 berths, a galley and toilet facility.

The boat is equipped with 3 cabins, 6-8 berths, a galley and toilet facility.

Rig

The boat has more than one rig.

One option is 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.

Another option is 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.

One option is 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.

Another option is 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

The Bianca 420 has been built with more than one type of keel.

One option is a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a long keel.But be aware that even though a Ellipse keel is very good for speed racing, a fishing nets and the like in the water can easily make you into a troublesome situation.

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.
As the surface of a fin type keel is just a fraction of the total wet surface,
the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts.

Bianca 420 can only enter major marinas as the draft is about 2.15 - 2.25 meter (7.05 - 7.35 ft) dependent on the load. See immersion rate below.

Engine

The boat is typically equipped with an inboard Yanmar diesel engine at 44.0 hp (32 kW), which gives a max speed about 6.9 knots.

The transmission is a shaft drive. A shaft drive will in the long run require less maintenence than other types of drive *e.g.* a sail drive.

The fuel tank which is made of stainless steel has a capacity of 140.0 liters (36 US gallons, 30 imperial gallons).

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 420 is 1.97, 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 7.8 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 Bianca 420 is about 270 kg/cm, alternatively 1514 lbs/inch.

Meaning: if you load 270 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1514 lbs cargo on the boat it will sink 1 inch.

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 420 is 24.7.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Bianca 420 is 3.27.

Ballast Ratio

The ballast ratio for Bianca 420 is 41%.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Bianca 420 is 198 which categorizes this boat among 'light racers'.

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 47m^{2} (505 ft^{2}).

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

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.

Fractional rig | ||||

Usage | Length | Diameter | ||

Jib sheet | 12.8 m | (41.8 feet) | 14 mm | (0.55 inch) |

Genoa sheet | 12.8 m | (41.8 feet) | 14 mm | (0.55 inch) |

Mainsheet | 31.9 m | (104.6 feet) | 14 mm | (0.55 inch) |

Spinnaker sheet | 28.1 m | (92.0 feet) | 14 mm | (0.55 inch) |

Masthead rig | ||||

Usage | Length | Diameter | ||

Jib sheet | 12.8 m | (41.8 feet) | 14 mm | (0.55 inch) |

Genoa sheet | 12.8 m | (41.8 feet) | 14 mm | (0.55 inch) |

Mainsheet | 31.9 m | (104.6 feet) | 14 mm | (0.55 inch) |

Spinnaker sheet | 28.1 m | (92.0 feet) | 14 mm | (0.55 inch) |

Boat owner's ideas

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

Finally

We are always looking for new photos. If you can contribute with photos for Bianca 420 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