Sunwind 31 anno 1984.

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Hull

Both the hull and the deck 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.

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

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

Interior

The interior is like most other boats made of teak.

The boat is equipped with 5 berths, a galley and toilet facility.

The boat is equipped with 5 berths, a galley and toilet facility.

Rig

The boat has 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

Keel of Sunwind 31.

Engine

The boat is typical equipped with multiple Volvo Penta engines at 18.0 hp (13 kW), which gives a max speed about 5.3 knots.

The fuel tank which is made of steel has a capacity of 20 liters (5 US gallons).

The fuel tank which is made of steel has a capacity of 20 liters (5 US 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 Sunwind 31 is 1.87, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

The capsize screening value for Sunwind 31 is 1.87, 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 6.5 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.

The theoretical maximal speed of a displacement boat of this length is 6.5 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 Sunwind 31 is about 140 kg/cm, alternative 788 lbs/inch.

Meaning: if you load 140 kg cargo on the boat then it will sink 1 cm. Alternative, if you load 788 lbs cargo on the boat it will sink 1 inch.

Meaning: if you load 140 kg cargo on the boat then it will sink 1 cm. Alternative, if you load 788 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 22,000 boat types and 350,000 data points.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Sunwind 31 is 24.8.

Comparing this ratio with similar sailboats show that it is more comfortable than 58% of all similar sailboat designs.
A comfort value is just above average.

The Motion Comfort Ratio for Sunwind 31 is 24.8.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Sunwind 31 is 3.22.

Compared with other similar sailboats it is slimmer than 58% of all other designs.
It seems that the designer has chosen a slightly more speedy hull design.

The l/b ratio for Sunwind 31 is 3.22.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Sunwind 31 is 39%.

This ballast ratio shows a righting moment that is higher than 38% of all similar sailboat designs.
A righting moment (ability to resist heeling) just below average.

The ballast ratio for Sunwind 31 is 39%.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Sunwind 31 is 277 which categorizes this boat among 'medium weight cruisers'.

38% 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.

The DL-ratio for Sunwind 31 is 277 which categorizes this boat among 'medium weight cruisers'.

SA/D (Sail Area Displacement ratio)

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

The SA/D for Sunwind 31 with ISO 8666 reference sail is 15.6, with a 135% genua the SA/D is 18.0.

The SA/D ratio indicates that it is faster than 42% of all similar sailboat designs in light wind.

The SA/D for Sunwind 31 with ISO 8666 reference sail is 15.6, with a 135% genua the SA/D is 18.0.

RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Sunwind 31 is 50

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

The Relative Speed Performance for Sunwind 31 is 50

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 25m^{2} (269 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.

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.

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 | 29.9 m | (98.2 feet) | 10 mm | (3/8 inch) |

Jib/genoa halyard | 29.9 m | (98.2 feet) | 10 mm | (3/8 inch) |

Spinnaker halyard | 29.9 m | (98.2 feet) | 10 mm | (3/8 inch) |

Jib sheet | 9.3 m | (30.6 feet) | 12 mm | (1/2 inch) |

Genoa sheet | 9.3 m | (30.6 feet) | 12 mm | (1/2 inch) |

Mainsheet | 23.4 m | (76.6 feet) | 12 mm | (1/2 inch) |

Spinnaker sheet | 20.5 m | (67.4 feet) | 12 mm | (1/2 inch) |

Cunningham | 3.7 m | (12.1 feet) | 10 mm | (3/8 inch) |

Kickingstrap | 7.4 m | (24.3 feet) | 10 mm | (3/8 inch) |

Clew-outhaul | 7.4 m | (24.3 feet) | 10 mm | (3/8 inch) |

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References