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Sailboat specifications and datasheets

First 51 cruising

The First 51, here in "cruising" 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 Wing keel.

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 Cruising
Type of hull Monohull
Category Offshore cruiser-racer sailboat
Shipyard
Designer German Frers
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1986
Last built hull Discontinued
Appendages Keel :
Fin without bulb
Helm 2 wheels
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 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 9’ 2”
Mast height from DWL 77’ 10”
Light displacement 28660 lbs
Ballast weight 14220 lbs
Ballast type Lead
First 51's   Rig and sails
Upwind sail area 1652 sq.ft
Downwind sail area 2933 sq.ft
Mainsail area 630 sq.ft
Genoa area 1023 sq.ft
Symetric spinnaker area 2303 sq.ft
Rigging type Sloop Marconi masthead
Rotating spars No
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging Single-strand (ROD)
Number of levels of spreaders 4
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 68’
JiFore triangle base (from mast foot to bottom of forestay) 20’
PiMainsail hoist measurement (from tack to head) 60’ 4”
EiMainsail foot measurement (from tack to clew) 18’ 6”
First 51's   Performances
HN (French rating) 30.5
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.
27.77
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.
49.29
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.
162
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.
50 %
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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