Detailed sailboat specifications and datasheets since 2015
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A27 Swing keel

Sailboat specifications

The A27 is a 27’5” (8.35m) cruiser-racer sailboat designed by Joubert Nivelt Design (France). She was built since 2012 (and now discontinued) by Archambault (France). The Swing keel version adopts an appendage configuration without compromise between draft and performance. Only drawbacks, a bit of space is taken inside and the price of the system...

The A27 is as well listed, on Boat-Specs.com, in Fin keel and Twin keel version (see all the versions compared).

A27's main features

Model
A27
Version
Swing keel
Hull type
Monohull
Category
Cruiser-racer sailboat
Sailboat builder
Sailboat designer
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester (vacuum infusion)
- Deck: Sandwich PVC fiberglass polyester (vacuum infusion)
First built hull
2012
Last built hull
Discontinued
Appendages
Lifting keel : swing keel
Helm
Single tiller
Rudder
Twin spade rudders
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

A27's main dimensions

Hull length
27’ 5”8.35 m
Waterline length
25’7.61 m
Beam (width)
9’ 10”2.98 m
Draft
6’ 11”2.1 m
Draft when appendages up
3’ 1”0.95 m
Light displacement (MLC)
4740 lb2150 kg
Ballast weight
1825 lb828 kg
Ballast type
Cast iron

A27's rig and sails

Upwind sail area
447 ft²41.5 m²
Downwind sail area
1044 ft²97 m²
Mainsail area
258 ft²24 m²
Genoa area
188 ft²17.5 m²
Symmetric spinnaker area
786 ft²73 m²
Asymmetric spinnaker area
786 ft²73 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
35’ 5”10.79 m
J
 iFore triangle base (from mast foot to bottom of forestay)
10’ 10”3.3 m
P
 iMainsail hoist measurement (from tack to head)
35’ 10”10.9 m
E
 iMainsail foot measurement (from tack to clew)
12’ 7”3.85 m
Rigging type
Sloop Marconi fractional
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
Swept-back
Spars construction
Aluminum spars

A27'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.
23.0
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.
268 ft²/T24.91 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.
627 ft²/T58.23 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.
138
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.
39 %
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.
6.70 knots

A27's auxiliary engine

Engine(s)
1 outboard or inboard engine
Engine(s) power
13 HP
Fuel type
Gas
Fuel tank capacity
7.9 gal30 liters

A27's accommodations and layout

Cockpit
Open aft cockpit
Berth(s)
4
Head(s)
1
Freshwater tank capacity
13.2 gal50 liters
Maximum headroom
5’ 2”1.6 m
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