The Southerly 42 RST
is a 42’2” (12.86m) cruising sailboat designed by Humphreys Yacht Design
(United Kingdom). She was built between 2007 and 2017 by Northshore
The Southerly 42 RST
has also been marketed as Southerly 430
Southerly 42 RST's main features
Southerly 42 RST
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 42 RST's main dimensions
42’ 2”12.86 m
36’ 6”11.11 m
13’ 2”4.03 m
8’ 11”2.72 m
Draft when appendages up
2’ 10”0.84 m
Mast height from DWL
61’ 6”18.73 m
Light displacement (MLC)
25003 lb11341 kg
8091 lb3670 kg
Southerly 42 RST's rig and sails
Upwind sail area
792 ft²73.62 m²
468 ft²43.44 m²
325 ft²30.18 m²
Sloop Marconi fractional
Deck stepped mast
Number of levels of spreaders
1x19 strand wire
Southerly 42 RST'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.
157 ft²/T14.58 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.
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.
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 42 RST's auxiliary engine
1 inboard engine
Fuel tank capacity
79.3 gal300 liters
Southerly 42 RST's accommodations and layout
Open aft cockpit
2 / 3
4 / 8
Freshwater tank capacity
71.3 gal270 liters
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