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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. And outside the sailing season, just bottom cleaning and perhaps anti-fouling painting once a year - a few hours of work, that's all.

Some boats has a hull made of Plywood.

Some boats has a hull made of Plywood.

Rig

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

The Mercury 18 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 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 even shallow marinas as the draft is just about 0.94 - 1.04 meter (3.08 - 3.38 ft) dependent on the load. See immersion rate below.

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 Mercury 18 is 2.06, indicating that this boat would not 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 4.8 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 Mercury 18 is about 42 kg/cm, alternatively 240 lbs/inch.

Meaning: if you load 42 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 240 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 Mercury 18 is 12.6.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Mercury 18 is 3.39.

Ballast Ratio

The ballast ratio for Mercury 18 is 58%.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Mercury 18 is 224 which categorizes this boat among 'light crusers & offshore racers'.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Mercury 18 with ISO 8666 reference sail is 25.0, with a 135% genua the SA/D is 28.6.

Over- / underrigged

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 8m^{2} (86 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

Dimensions of sail for masthead 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.

Usage | Length | Diameter | ||

Mainsail halyard | 18.0 m | (59.1 feet) | 6 mm | (1/4 inch) |

Jib/genoa halyard | 18.0 m | (59.1 feet) | 6 mm | (1/4 inch) |

Spinnaker halyard | 18.0 m | (59.1 feet) | 6 mm | (1/4 inch) |

Jib sheet | 5.5 m | (18.0 feet) | 8 mm | (5/16 inch) |

Genoa sheet | 5.5 m | (18.0 feet) | 8 mm | (5/16 inch) |

Mainsheet | 13.7 m | (45.0 feet) | 8 mm | (5/16 inch) |

Spinnaker sheet | 12.1 m | (39.6 feet) | 8 mm | (5/16 inch) |

Cunningham | 2.8 m | (9.1 feet) | 6 mm | (1/4 inch) |

Kickingstrap | 5.5 m | (18.2 feet) | 6 mm | (1/4 inch) |

Clew-outhaul | 5.5 m | (18.2 feet) | 6 mm | (1/4 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 Mercury 18 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