Océanis 51.1 Deep draft

Sailboat specifications

The Océanis 51.1 is a 49’1” (14.98m) cruising sailboat designed by Berret Racoupeau Yachts Design (France). She is built since 2017 by Bénéteau (France). The Deep draft version offers a deeper L-shaped keel bringing extra performance especially upwind.

The Océanis 51.1 is as well listed, on Boat-Specs.com, in Shoal draft and Performance version (see all the versions compared).

Find out more about the Océanis 51.1 on Boat-Spec's blog: European Yacht of the Year 2018.

Océanis 51.1's main features

Model: Océanis 51.1
Version: Deep draft
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: Sandwich balsa fiberglass polyester (vacuum infusion)
- Deck: Sandwich foam fiberglass polyester (injection molding process)
First built hull: 2017
Last built hull: Still in production
Appendages: Keel : L-shaped keel (with bulb)
Helm: Twin helm wheels
Rudder: Twin spade rudders
Unsinkable: No
Trailerable: No
EC design category iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions) A: Wind < force 9, Waves < 10m B: Wind < force 8, Waves < 8m C: Wind < force 6, Waves < 4m D: Wind < force 4, Waves < 0,5m: A
Standard public price ex. VAT (indicative only): About
291 000 €
(2020)

Océanis 51.1's main dimensions

Overall length: 50’ 7”15.43 m
Hull length: 49’ 1”14.98 m
Waterline length: 47’ 7”14.52 m
Beam (width): 15’ 8”4.8 m
Draft: 7’ 8”2.36 m
Mast height from D_WL: 70’ 2”21.4 m
Light displacement (M_LC): 30710 lb13930 kg
Ballast weight: 7487 lb3396 kg
Ballast type: Cast iron

Océanis 51.1's rig and sails

Upwind sail area: 1313 ft²122 m²
Downwind sail area: 2551 ft²237 m²
Mainsail area: 614 ft²57 m²
Genoa area: 700 ft²65 m²
Asymmetric spinnaker area: 1938 ft²180 m²
Code 0 area: 1485 ft²138 m²
I iFore triangle height (from mast foot to fore stay top attachment): 60’ 1”18.32 m
J iFore triangle base (from mast foot to bottom of forestay): 20’ 8”6.3 m
P iMainsail hoist measurement (from tack to head): 57’ 8”17.58 m
E iMainsail foot measurement (from tack to clew): 18’5.5 m
Rigging type: Sloop Marconi 9/10
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars (carbon fiber spars as an option)
Standing rigging: 1x19 strand wire

Océanis 51.1'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.: 227 ft²/T21.07 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.: 441 ft²/T40.94 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.: 129
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.: 24 %
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.: 9.25 knots