Detailed sailboat specifications and datasheets since 2015
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Southerly 480

Sailboat specifications

The Southerly 480 is a 48’8” (14.83m) cruising sailboat designed by Stephen Jones Yacht Design (United Kingdom). She was built between 2019 and 2020 by Discovery Yachts Group (United Kingdom).

Southerly 480's main features

Model
Southerly 480
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
2019
Last built hull
2020
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 < 0,5m
A
Standard public price ex. VAT (indicative only)
N/A

Southerly 480's main dimensions

Overall length
48’ 8”14.83 m
Hull length
48’ 8”14.83 m
Waterline length
42’ 10”13.05 m
Beam (width)
14’ 7”4.46 m
Draft
10’ 2”3.12 m
Draft when appendages up
3’ 4”1 m
Mast height from DWL
71’ 7”21.83 m
Light displacement (MLC)
38043 lb17256 kg
Ballast weight
13492 lb6120 kg

Southerly 480's rig and sails

Upwind sail area
1399 ft²130 m²
Mainsail area
619 ft²57.5 m²
Genoa area
780 ft²72.5 m²
Jib area
491 ft²45.6 m²
Rigging type
Sloop Marconi (in-mast furling mainsail) 9/10
Mast configuration
Keel stepped mast
Rotating spars
No
Number of levels of spreaders
2
Spreaders angle
Swept-back
Spars construction
Aluminum spars

Southerly 480'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.
210 ft²/T19.47 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.
220
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.
35 %
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.
8.77 knots

Southerly 480's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
80 HP
Fuel type
Diesel
Fuel tank capacity
175.4 gal664 liters

Southerly 480's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
3
Berth(s) (min./max.)
6 / 8
Head(s)
2
Freshwater tank capacity
106.5 gal403 liters
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