The Southerly 535
is a 54’7” (16.63m) cruising sailboat designed by Dubois Naval Architects
(United Kingdom). She was built between 2014 and 2017 by Northshore
The Southerly 535
has also been marketed as Southerly 540
Southerly 535's main features
Offshore deck saloon cruising sailboat
GRP (glass reinforced polyester):
Single skin bottom, sandwich sides and deck: fiberglass vinylester vacuum bagged
First built hull
Last built hull
Lifting keel : swing keel
Twin helm wheels
Twin spade rudders
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
Standard public price ex. VAT (indicative only)
Southerly 535's main dimensions
54’ 7”16.63 m
48’ 11”14.9 m
15’ 8”4.8 m
Draft when appendages up
3’ 6”1.06 m
Mast height from DWL
80’ 2”24.43 m
Light displacement (MLC)
51478 lb23350 kg
Southerly 535's rig and sails
Upwind sail area
1938 ft²180 m²
893 ft²83 m²
1044 ft²97 m²
549 ft²51 m²
Sloop Marconi 9/10
Keel stepped mast
Number of levels of spreaders
Southerly 535'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.
237 ft²/T22.03 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.
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.
Southerly 535's auxiliary engine
1 inboard engine
Fuel tank capacity
237.8 gal900 liters
Southerly 535's accommodations and layout
Freshwater tank capacity
211.3 gal800 liters
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