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Sailboat specifications and datasheets

First 51 wing keel

The First 51, here in "wing keel" version, is a 50’ offshore monohull sailboat designed by German Frers. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. The production started in 1986 .

The First 51 belongs to the First range. The First 51 is as well listed, on Boat-Specs.com, in version Cruising.

Bénéteau First 51 Bénéteau First 51 sailplanBénéteau First 51 layoutBénéteau First 51 sailingBénéteau First 51 accommodations
First 51's   Main Features
Model First 51
Version Wing keel
Type of hull Monohull
Shipyard
Designer German Frers
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1986
Appendages Keel :
Wing keel
Helm 2 wheels
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 1
Standard public price (indicative only) N/A
First 51's   Main dimensions
Length overall 51’ 4”
Hull length 50’
Waterline length 43’ 1”
Beam (width) 14’ 11”
Waterline beam (width) 12’ 1”
Draft 5’ 11”
Mast height from DWL 73’ 10”
Light displacement 30865 lbs
Ballast weight 14220 lbs
Ballast type Cast iron
First 51's   Rig and sails
Upwind sail area 1538 sq.ft
Downwind sail area 2719 sq.ft
Mainsail area 566 sq.ft
Genoa area 971 sq.ft
Symetric spinnaker area 2153 sq.ft
Rigging type Sloop Marconi masthead
Spars Mast and boom in Aluminum
Standing rigging Single-strand (ROD)
Number of levels of spreaders 3
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 64’
JiFore triangle base (from mast foot to bottom of forestay) 20’
PiMainsail hoist measurement (from tack to head) 56’ 5”
EiMainsail foot measurement (from tack to clew) 18’ 5”
First 51's   Performances
HN (French rating) 28.0
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.
24.59
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.
43.49
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.
174
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.
46 %
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.
8.80 knots
First 51's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 80 HP
Fuel type Diesel
Fuel tank capacity 184.9 gal
First 51's   Accommodation
Cabin(s) (min/max) 3 / 4
Berth(s) (min/max) 8 / 10
Fresh water tank capacity 74 gal
Water heater capacity 11.1 gal
Maximum headroom 6’ 5”

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