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Sailboat specifications and datasheets

A27 swing keel

The A27, here in "swing keel" version, is a 27’5” 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 2012 .

The A27 is as well listed, on Boat-Specs.com, in version Fin keel and Twin keel.

Archambault A27 Archambault A27 sailplanArchambault A27 layoutArchambault A27 sailingArchambault A27 sailingArchambault A27 sailingArchambault A27 cockpitArchambault A27 accommodationsArchambault A27 detail
A27's   Main Features
Model A27
Version Swing keel
Type of hull Monohull
Shipyard
Designer Michel Joubert
Bernard Nivelt
Construction Hull:
monolithic fiberglass / polyester (composite infusion)
Deck:
sandwich PVC / fiberglass / polyester (composite infusion)
First built hull 2012
Appendages Keel (lifting) :
Swing keel
Helm 1 tiller
Rudder 2 spade rudders
Unsinkable No
Trailerable No
EC certification B
Standard public price (indicative only) N/A
A27's   Main dimensions
Hull length 27’ 5”
Waterline length 25’
Beam (width) 9’ 10”
Draft 6’ 11”
Draft when appendages up 3’ 1”
Light displacement 4740 lbs
Ballast weight 1825 lbs
Ballast type Cast iron
A27's   Rig and sails
Upwind sail area 447 sq.ft
Downwind sail area 1044 sq.ft
Mainsail area 258 sq.ft
Genoa area 188 sq.ft
Symetric spinnaker area 786 sq.ft
Asymetric spinnaker area 786 sq.ft
Rigging type Sloop Marconi fractional
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) 35’ 5”
JiFore triangle base (from mast foot to bottom of forestay) 10’ 10”
PiMainsail hoist measurement (from tack to head) 35’ 10”
EiMainsail foot measurement (from tack to clew) 12’ 7”
A27's   Performances
HN (French rating) 23.0
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.
24.91
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.
58.23
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.
138
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.
39 %
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.
6.70 knots
A27's   Auxiliary engine
Engine(s) 1
Engine type Outboard or inboard engine
Engine 13 HP
Fuel type Gas
Fuel tank capacity 7.9 gal
A27's   Accommodation
Berth(s) 4
Head(s) 1
Fresh water tank capacity 13.2 gal
Maximum headroom 5’ 2”

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