Sailboat specifications and datasheets


The A31 is a 31’4” monohull sailboat designed by Michel Joubert and Bernard Nivelt. She was built by Archambault (France) and made of monolithic fiberglass / polyester (composite infusion). The production started in 2009 .
Archambault A31 Archambault A31 sailplanArchambault A31 layoutArchambault A31 sailingArchambault A31 sailingArchambault A31 sailingArchambault A31 accommodationsArchambault A31 accommodationsArchambault A31 accommodationsArchambault A31 accommodationsArchambault A31 accommodations
A31's   Main Features
Model A31
Type of hull Monohull
Designer Michel Joubert
Bernard Nivelt
Construction Hull:
monolithic fiberglass / polyester (composite infusion)
sandwich PVC / fiberglass / polyester (injection molding process)
First built hull 2009
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
EC certification A
Standard public price (indicative only)
123 083
A31's   Main dimensions
Length overall 31’ 4”
Hull length 31’ 4”
Beam (width) 10’ 7”
Draft 6’ 2”
Light displacement 6945 lbs
Ballast weight 2976 lbs
Ballast type Lead
A31's   Rig and sails
Upwind sail area 554 sq.ft
Mainsail area 307 sq.ft
Genoa area 248 sq.ft
Rigging type Sloop Marconi 9/10
Spars Mast and boom in Aluminum
Number of levels of spreaders 2
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 39’ 8”
JiFore triangle base (from mast foot to bottom of forestay) 12’
PiMainsail hoist measurement (from tack to head) 39’ 7”
EiMainsail foot measurement (from tack to clew) 13’ 4”
A31's   Performances
HN (French rating) 26.0
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.
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.
43 %
A31's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 14 HP
Fuel type Diesel
Fuel tank capacity 10.6 gal
A31's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 26.4 gal
Fridge/ice-box capacity 10.6 gal
Head headroom 5’ 7”
A31's   Saloon
Maximum headroom 6’
Berth length 6’ 1”
Berth width 1’ 10”
A31's   Fore cabin
Maximum headroom 2’ 11”
Berth length 6’ 6”
Berth width 3’ 11”
A31's   Aft cabin
Maximum headroom 5’ 7”
Berth length 6’ 4”
Berth width 4’ 10”

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