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Sailboat specifications and datasheets

First 405 shoal draft

The 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.

Bénéteau First 405 Bénéteau First 405 sailplanBénéteau First 405 layoutBénéteau First 405 sailingBénéteau First 405 cockpitBénéteau First 405 accommodationsBénéteau First 405 accommodationsBénéteau First 405 accommodations
First 405's   Main Features
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
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
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
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
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
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

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