Océanis 381 Furling mainsail

Sailboat specifications

The Océanis 381 is a 37’8” (11.5m) cruising sailboat designed by Berret Racoupeau Yachts Design (France). She was built between 1996 and 2000 by Bénéteau (France). The Furling mainsail version is proposed with an in-mast furling system to ease the sailing.

The Océanis 381 is as well listed, on Boat-Specs.com, in Classic version (see all the versions compared).

Océanis 381's main features

Model: Océanis 381
Version: Furling mainsail
Hull type: Monohull
Category: Offshore cruising sailboat
Sailboat builder: Bénéteau
Sailboat designer: Berret Racoupeau Yachts Design
Sailboat range: Océanis
Country: France
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built: About 300
First built hull: 1996
Last built hull: 2000
Appendages: Keel : L-shaped keel (with bulb)
Helm: Single helm wheel
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 1
Standard public price ex. VAT (indicative only): N/A €

Océanis 381's main dimensions

Overall length: 38’ 6”11.75 m
Hull length: 37’ 8”11.5 m
Waterline length: 32’ 10”10 m
Beam (width): 12’ 11”3.93 m
Draft: 5’ 4”1.62 m
Light displacement (M_LC): 14991 lb6800 kg
Ballast weight: 4740 lb2150 kg
French customs tonnage: 15.30 Tx

Océanis 381's rig and sails

Upwind sail area: 716 ft²66.56 m²
Downwind sail area: 1165 ft²108.21 m²
Mainsail area: 304 ft²28.21 m²
Genoa area: 413 ft²38.35 m²
Symmetric spinnaker area: 861 ft²80 m²
I iFore triangle height (from mast foot to fore stay top attachment): 45’ 5”13.85 m
J iFore triangle base (from mast foot to bottom of forestay): 13’3.96 m
P iMainsail hoist measurement (from tack to head): 38’ 2”11.63 m
E iMainsail foot measurement (from tack to clew): 16’ 2”4.95 m
Rigging type: Sloop Marconi (in-mast furling mainsail) masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire

Océanis 381's performances

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.: 200 ft²/T18.54 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.: 325 ft²/T30.15 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.: 193
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.: 32 %
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.: 7.68 knots