**First 405**, here in "

*shoal draft*" version, is a 39’4”

**offshore monohull sailboat**designed by

*Jean Berret*. She was built by

*Bénéteau*(France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1985 and 1988 with about 250 hulls completed.

The **First 405** belongs to the *First* range. The **First 405** is as well listed, on Boat-Specs.com, in version Deep draft.

First 405's Main Features | |
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Model | First 405 |

Version | Shoal draft |

Type of hull | Monohull |

Category | Cruiser-racer sailboat |

Shipyard | |

Designer | Jean Berret |

Range | First |

Construction | Hull: monolithic fiberglass / polyester Deck: sandwich balsa / fiberglass / polyester |

First built hull | 1985 |

Last built hull | 1988 |

Number of hulls built | About 250 |

Appendages | Keel : Fin without bulb |

Helm | 1 wheel |

Rudder | 1 spade rudder |

Cockpit | Closed aft cockpit |

Unsinkable | No |

Trailerable | No |

French navigation category | 1 |

Standard public price ex. VAT (indicative only) | N/A |

First 405's Main dimensions | |
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Length overall | 40’ 11” |

Hull length | 39’ 4” |

Waterline length | 35’ 10” |

Beam (width) | 13’ |

Waterline beam (width) | 10’ 8” |

Draft | 5’ 7” |

Mast height from DWL | 56’ 7” |

Fore freeboard | 4’ |

Mid-ship freeboard | 3’ 8” |

Light displacement | 18519 lbs |

Ballast weight | 8157 lbs |

Ballast type | Cast iron |

First 405's Rig and sails | |
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Upwind sail area | 915 sq.ft |

Downwind sail area | 1579 sq.ft |

Mainsail area | 352 sq.ft |

Genoa area | 563 sq.ft |

Symetric spinnaker area | 1227 sq.ft |

Rigging type | Sloop Marconi masthead |

Rotating spars | No |

Mast position | Keel stepped mast |

Spars | Mast and boom in Aluminum |

Standing rigging | 1x19 strand wire |

Number of levels of spreaders | 2 |

Spreaders angle | Swept-back |

First 405's Performances | |
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Upwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat. |
20.58 |

Downwind sail area to displacementiThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size. Upwind : under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 23 it indicates a fast sailboat. |
35.50 |

Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).The DLR can be used to compare the relative mass of different sailboats no matter what their length: a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat. |
184 |

Ballast ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.Higher the ballast ratio is, greater is the stability. |
44 % |

Wetted surface | 339 sq.ft |

Righting moment @ 1°iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. Its value corresponds to the torque needed to heel the boat for this angle.Higher the righting moment is for an angle, greater is the stability at this angle. |
974 lbs.ft |

Maximum transverse section | 21 sq.ft |

Hull speediAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34. |
8.01 knots |

First 405's Auxiliary engine | |
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Engine(s) | 1 |

Engine type | Inboard engine |

Engine (min/max) | 40 HP / 50 HP |

Fuel type | Diesel |

Fuel tank capacity | 34.3 gal |

First 405's Accommodation | |
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Cabin(s) (min/max) | 2 / 3 |

Berth(s) (min/max) | 4 / 8 |

Head(s) (min/max) | 1 / 2 |

Fresh water tank capacity | 105.7 gal |

Water heater capacity | 11.1 gal |