Detailed sailboat specifications and datasheets since 2015
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First 31.7 Shoal draft

Sailboat specifications

The First 31.7 is a 31’2” (9.5m) cruiser-racer sailboat designed by Finot Conq Architectes (France). She was built between 1997 and 2010 by Bénéteau (France). The Shoal draft version features a shorter keel to grant access to shallow areas.

The First 31.7 is as well listed, on Boat-Specs.com, in Deep draft version (see all the versions compared).

First 31.7's main features

Model
First 31.7
Version
Shoal draft
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
About 1500
First built hull
1997
Last built hull
2010
Appendages
Keel : L-shaped keel (with bulb)
Helm
Single tiller
Rudder
Single spade rudder
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
B
Standard public price ex. VAT (indicative only)
N/A

First 31.7's main dimensions

Overall length
31’ 6”9.61 m
Hull length
31’ 2”9.5 m
Waterline length
28’ 11”8.8 m
Beam (width)
10’ 7”3.23 m
Draft
4’ 10”1.45 m
Mast height from DWL
45’ 7”13.9 m
Light displacement (MLC)
8267 lb3750 kg
Ballast weight
2260 lb1025 kg
Ballast type
Cast iron
French customs tonnage
9.36 Tx

First 31.7's rig and sails

Upwind sail area
565 ft²52.5 m²
Downwind sail area
1011 ft²93.96 m²
Mainsail area
254 ft²23.6 m²
Genoa area
311 ft²28.9 m²
Solent area
226 ft²21 m²
Jib area
205 ft²19 m²
Symmetric spinnaker area
757 ft²70.36 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
38’ 11”11.87 m
J
 iFore triangle base (from mast foot to bottom of forestay)
11’ 4”3.44 m
P
 iMainsail hoist measurement (from tack to head)
35’ 5”10.8 m
E
 iMainsail foot measurement (from tack to clew)
12’ 10”3.9 m
Rigging type
Sloop Marconi 9/10
Mast configuration
Keel stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire

First 31.7's performances

HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
21.0
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.
234 ft²/T21.75 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.
419 ft²/T38.93 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.
156
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.
27 %
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.
7.20 knots

First 31.7's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
21 HP
Fuel type
Diesel
Fuel tank capacity
7.9 gal30 liters

First 31.7's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
2
Berth(s)
6
Head(s)
1
Freshwater tank capacity
42.3 gal160 liters
Holding tank capacity
13.2 gal50 liters
Fridge/ice-box capacity
18.5 gal70 liters
Boiler capacity
5.8 gal22 liters
Head headroom
5’ 11”1.8 m

First 31.7's saloon

Maximum headroom
6’1.82 m

First 31.7's fore cabin

Maximum headroom
5’ 8”1.75 m
Berth length
6’ 7”2 m
Berth width
4’ 7”1.4 m

First 31.7's aft cabin

Maximum headroom
5’ 11”1.8 m
Berth length
6’ 7”2 m
Berth width
4’ 11”1.5 m
Have you spotted incorrect data?  You can report it in the forum or contact the webmaster

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