The
Southerly 42 is a 42’2” (12.86m) cruising sailboat designed by
Humphreys Yacht Design (United Kingdom). She is built since 2020 by
Discovery Yachts Group (United Kingdom).
The
Southerly 42 has also been marketed as
Southerly 430.
Southerly 42's main features
Model
Southerly 42
Hull type
Monohull
Category
Offshore deck saloon cruising sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
United Kingdom
Construction
GRP (glass reinforced polyester):
Single skin bottom, sandwich sides and deck: fiberglass vinylester 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
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 < 0,5mA
Standard public price ex. VAT (indicative only)
Southerly 42's main dimensions
Hull length
42’ 2”12.86 m
Waterline length
36’ 6”11.11 m
Beam (width)
13’ 2”4.03 m
Draft
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
Ballast weight
8091 lb3670 kg
Southerly 42's rig and sails
Upwind sail area
792 ft²73.62 m²
Mainsail area
468 ft²43.44 m²
Jib area
325 ft²30.18 m²
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
Standing rigging
1x19 strand wire
Southerly 42'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.234
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.32 %
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 1.34.8.09 knots
Southerly 42's auxiliary engine
Engine(s)
1 inboard engine
Engine(s) power
57 HP
Fuel type
Diesel
Fuel tank capacity
79.3 gal300 liters
Southerly 42's accommodations and layout
Cockpit
Open aft cockpit
Cabin(s) (min./max.)
2 / 3
Berth(s) (min./max.)
4 / 8
Head(s)
2
Freshwater tank capacity
71.3 gal270 liters
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