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Sailboat specifications and datasheets

First 31.7 deep draft

The First 31.7, here in "deep draft" version, is a 31’2” monohull sailboat designed by Jean Marie Finot and Pascal Conq. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1997 and 2010 with about 1500 hulls completed.

The First 31.7 belongs to the First range. The First 31.7 is as well listed, on Boat-Specs.com, in version Shoal draft.

Bénéteau First 31.7 Bénéteau First 31.7 sailplanBénéteau First 31.7 layoutBénéteau First 31.7 sailingBénéteau First 31.7 sailingBénéteau First 31.7 cockpitBénéteau First 31.7 accommodations
First 31.7's   Main Features
Model First 31.7
Version Deep draft
Type of hull Monohull
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range First
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1997
Last built hull 2010
Number of hulls built About 1500
Appendages Keel :
Fin with bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
EC certification A
Standard public price (indicative only) N/A
First 31.7's   Main dimensions
Length overall 31’ 6”
Hull length 31’ 2”
Waterline length 28’ 11”
Beam (width) 10’ 7”
Draft 6’ 2”
Mast height from DWL 45’ 7”
Light displacement 8267 lbs
Ballast weight 2260 lbs
Ballast type Cast iron
French customs tonnage 9.36 Tx
First 31.7's   Rig and sails
Upwind sail area 565 sq.ft
Downwind sail area 1011 sq.ft
Mainsail area 254 sq.ft
Genoa area 311 sq.ft
Solent area 226 sq.ft
Jib area 205 sq.ft
Symetric spinnaker area 757 sq.ft
Rigging type Sloop Marconi 9/10
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 38’ 11”
JiFore triangle base (from mast foot to bottom of forestay) 11’ 4”
PiMainsail hoist measurement (from tack to head) 35’ 5”
EiMainsail foot measurement (from tack to clew) 12’ 10”
First 31.7's   Performances
HN (French rating) 21.0
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.
21.75
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.
38.93
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.
156
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.
27 %
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.
7.20 knots
First 31.7's   Auxiliary engine
Number of engine(s) 1
Engine type Inboard engine
Engine (min/max) 21 HP
Fuel type Diesel
Fuel tank capacity 7.9 gal
First 31.7's   Accommodation
Number of cabin(s) 2
Number of berth(s) 6
Number of head(s) 1
Fresh water tank capacity 42.3 gal
Water heater capacity 5.8 gal
Holding tank capacity 13.2 gal
Fridge/ice-box capacity 18.5 gal
Head headroom 5’ 11”
First 31.7's   Saloon
Maximum headroom 6’
First 31.7's   Fore cabin
Maximum headroom 5’ 8”
Berth length 6’ 7”
Berth width 4’ 7”
First 31.7's   Aft cabin
Maximum headroom 5’ 11”
Berth length 6’ 7”
Berth width 4’ 11”

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