| Main features | First 405 Shoal draft |
Model | First 405 |
Version | Shoal draft |
Hull type | Monohull |
Category | Cruiser-racer sailboat |
Sailboat builder | Bénéteau |
Sailboat designer | |
Sailboat range | |
Country | France |
Construction | GRP (glass reinforced polyester): - Hull: Single skin fiberglass polyester - Deck: Sandwich balsa fiberglass polyester |
Number of hulls built | About 250 |
First built hull | 1985 |
Last built hull | 1988 |
Appendages | Keel : fin without bulb |
Helm | Single helm wheel |
Rudder | Single spade rudder |
Unsinkable | No |
Trailerable | No |
Former French navigation category | 1 |
| Main dimensions | First 405 Shoal draft |
Overall length | 40’ 11”12.46 m |
Hull length | 39’ 4”11.99 m |
Waterline length | 35’ 10”10.9 m |
Beam (width) | 13’3.96 m |
Waterline beam (width) | 10’ 8”3.27 m |
Draft | 5’ 7”1.7 m |
Mast height from DWL | 56’ 7”17.25 m |
Fore freeboard | 4’1.23 m |
Mid-ship freeboard | 3’ 8”1.12 m |
Light displacement (MLC) | 18519 lb8400 kg |
Ballast weight | 8157 lb3700 kg |
Ballast type | Cast iron |
| Rig and sails | First 405 Shoal draft |
Upwind sail area | 915 ft²85.03 m² |
Downwind sail area | 1579 ft²146.7 m² |
Mainsail area | 352 ft²32.7 m² |
Genoa area | 563 ft²52.33 m² |
Symmetric spinnaker area | 1227 ft²114 m² |
Rigging type | Sloop Marconi masthead |
Mast configuration | Keel stepped mast |
Rotating spars | No |
Number of levels of spreaders | 2 |
Spreaders angle | Swept-back |
Spars construction | Aluminum spars |
Standing rigging | 1x19 strand wire |
| Performances | First 405 Shoal draft |
Upwind sail area to displacement iThe 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 25 it indicates a fast sailboat. | 222 ft²/T20.58 m²/T |
Downwind sail area to displacement iThe 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. | 382 ft²/T35.5 m²/T |
Displacement-length ratio (DLR) iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The 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 ratio iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.The higher the ballast ratio is, the greater is the stability. | 44 % |
Wetted area | 339 ft²31.45 m² |
Righting moment @ 1° iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. 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. | 974 lb.ft135 kg.m |
Maximum transverse section | 21 ft²1.94 m² |
Critical hull speed iAs 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 |
| Auxiliary engine | First 405 Shoal draft |
Engine(s) | 1 inboard engine |
Engine(s) power (min./max.) | 40 HP / 50 HP |
Fuel type | Diesel |
Fuel tank capacity | 34.3 gal130 liters |
| Accommodations and layout | First 405 Shoal draft |
Cockpit | Closed aft cockpit |
Cabin(s) (min./max.) | 2 / 3 |
Berth(s) (min./max.) | 4 / 8 |
Head(s) (min./max.) | 1 / 2 |
Freshwater tank capacity | 105.7 gal400 liters |
Boiler capacity | 11.1 gal42 liters |