Detailed sailboat specifications and datasheets since 2015
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Southerly 57

Sailboat specifications

The Southerly 57 is a 57’4” (17.48m) cruising sailboat designed by Dubois Naval Architects (United Kingdom). She is built since 2020 by Discovery Yachts Group (United Kingdom).

The Southerly 57 has also been marketed as Southerly 57RS.

Southerly 57's main features

Model
Southerly 57
Hull type
Monohull
Category
Offshore cruising sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
United Kingdom
Construction
GRP (glass reinforced polyester):
Single skin bottom, sandwich sides and deck: fiberglass polyester vacuum bagged
First built hull
2020
Last built hull
Still in production
Appendages
Lifting keel : swing keel
Helm
Twin helm wheels
Rudder
Twin spade rudders
Unsinkable
No
Trailerable
No
Standard public price ex. VAT (indicative only)
N/A €

Southerly 57's main dimensions

Overall length
58’ 2”17.73 m
Hull length
57’ 4”17.48 m
Waterline length
52’ 6”16 m
Beam (width)
17’ 1”5.2 m
Draft
10’ 8”3.27 m
Draft when appendages up
3’ 6”1.07 m
Mast height from DWL
84’ 1”25.62 m
Light displacement (MLC)
58755 lb26651 kg
Maximum displacement (MLDC)
76639 lb34763 kg
Ballast weight
18409 lb8350 kg
Ballast type
Cast iron

Southerly 57's rig and sails

Upwind sail area
2110 ft²196 m²
Downwind sail area
3014 ft²280 m²
Mainsail area
990 ft²92 m²
Genoa area
1119 ft²104 m²
Jib area
635 ft²59 m²
Asymmetric spinnaker area
2024 ft²188 m²
Rigging type
Sloop Marconi 9/10
Mast configuration
Keel stepped mast
Rotating spars
No
Number of levels of spreaders
3
Spreaders angle
Swept-back
Spars construction
Aluminum spars

Southerly 57's performances

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.
236 ft²/T21.97 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.
338 ft²/T31.38 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.
184
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.
31 %
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.
9.71 knots

Southerly 57's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
146 HP
Fuel type
Diesel
Fuel tank capacity
367.7 gal1392 liters

Southerly 57's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s) (min./max.)
3 / 4
Berth(s) (min./max.)
6 / 10
Head(s) (min./max.)
2 / 3
Freshwater tank capacity
274.7 gal1040 liters
Holding tank capacity
126.3 gal478 liters
Fridge/ice-box capacity
87.7 gal332 liters
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Hull length
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